CN109586271A

CN109586271A - A kind of DC power system and machine control method, equipment and system

Info

Publication number: CN109586271A
Application number: CN201811287501.7A
Authority: CN
Inventors: 陈保国; 王红兵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2019-04-05
Anticipated expiration: 2038-10-31
Also published as: CN109586271B

Abstract

The invention discloses a kind of DC power system and machine control method, equipment and system, method include: by and the electric current of machine busbar be compared with predetermined current；And machine busbar includes simultaneously machine positive busbar and simultaneously machine negative busbar；And the electric current setting of machine busbar is positive with the current direction that the first power supply in described and machine positive busbar flows to second source, or, simultaneously the electric current setting of machine busbar is positive with the current direction that second source in described and machine positive busbar flows to the first power supply；The output voltage of second source is adjusted according to the simultaneously electric current of machine busbar and the comparison result of predetermined current, until simultaneously the electric current of machine busbar is consistent with predetermined current, so that second source follows the working condition of the first power supply.In the method, it according to the output voltage of the simultaneously electric current of machine busbar and the comparison result of predetermined current control second source, realizes the electric current accurately controlled between second source and the first power supply, avoids having a adverse impact to the first power supply.

Description

A kind of DC power system and machine control method, equipment and system

Technical field

The present invention relates to power electronics field more particularly to a kind of DC power system and machine control method, set Standby and system.

Background technique

The input of the typical DC power supply system for communications is alternating current, or direct current.Such as it is defeated when power-supply system When entering for alternating current, power-supply system includes rectification unit and DC-DC DC-DC unit.When the input of power-supply system is straight When galvanic electricity, power-supply system can only include DC-DC unit.But no matter the input of power-supply system be direct current or alternating current, Power-supply system generally includes reserve battery, i.e., when the input of power-supply system power-off, reserve battery can be load supplying.

In the communications field, each telecom operators, there are a large amount of first power supplys to be unable to satisfy the newly-increased power demands loaded, It needs to carry out dilatation to the first power supply, i.e. increase second source, is connected in parallel on second source and the DC output end of the first power supply It is together load supplying, to meet the power demands of newly-increased load.The DC master row and the first power supply of general setting second source DC master row parallel connection formed and machine busbar.

The DC output end of second source and the first power supply technical issues that need to address that are connected in parallel are second sources It needs to follow the working condition of the first power supply, the working performance of original system cannot be deteriorated, especially filled to what reserve battery charged Electric management function.

Therefore, those skilled in the art need to provide a kind of method, so that the direct current output of second source and the first power supply When end is connected in parallel, second source can follow the working condition of the first power supply.

Summary of the invention

In order to solve the technical problems existing in the prior art, a kind of the application provides DC power system and machine is controlled Method, equipment and system, so that second source can when the DC output end of second source and the first power supply is connected in parallel Accurately follow the working condition of the first power supply.

That first aspect provides a kind of DC power system and machine control method, the DC power system include: first Power supply and second source；The DC output end of the second source and the first power supply is connected in parallel by simultaneously machine busbar, the party Method includes:

Described and machine busbar electric current is compared with predetermined current；Described and machine busbar is including simultaneously machine positive busbar and simultaneously Machine negative busbar；Described and machine busbar electric current setting flows to the second source with the first power supply described in described and machine positive busbar Current direction be positive, or, the setting of described and machine busbar electric current flows to the with second source described in described and machine positive busbar The current direction of one power supply is positive；

The output voltage of the second source is adjusted according to the comparison result of described and machine busbar electric current and predetermined current, Until described and machine busbar electric current is consistent with the predetermined current, so that the second source follows the work of first power supply Make state.

In the first possible implementation of the first aspect, the predetermined current is fixed value.

With reference to first aspect and in any of the above-described kind of possible implementation, in the second possible implementation, institute The ratio that predetermined current is pre-set constant power with simultaneously electromechanical pressure is stated, described and electromechanical pressure is first power supply and second source The output voltage being connected in parallel.

With reference to first aspect and in any of the above-described kind of possible implementation, in the third possible implementation, root The output voltage of the second source is adjusted according to the comparison result of described and machine busbar electric current and predetermined current, described in simultaneously The electric current of machine busbar is consistent with the predetermined current, specifically includes:

When described and machine busbar electric current is greater than predetermined current, the output voltage for adjusting the second source increases, directly It is consistent with the predetermined current to described and machine busbar the electric current；

When described and machine busbar electric current is less than predetermined current, the output voltage for adjusting the second source reduces, directly It is consistent with the predetermined current to described and machine busbar the electric current.

With reference to first aspect and in any of the above-described kind of possible implementation, in the fourth possible implementation, root The output voltage that the second source is adjusted according to the comparison result of described and machine busbar electric current and predetermined current, specifically includes:

According to the difference of described and machine busbar electric current and predetermined current by pid calculation pid algorithm or FUZZY ALGORITHMS FOR CONTROL adjusts the output voltage of the second source.

A kind of second aspect provides DC power system and machine control equipment, the DC power system includes: first Power supply and second source；The DC output end of the second source and the first power supply is connected in parallel by simultaneously machine busbar；

The control equipment, for described and machine busbar electric current to be compared with predetermined current；Described and machine busbar Including simultaneously machine positive busbar and and machine negative busbar；Described and machine busbar electric current setting is with the first electricity described in described and machine positive busbar Source stream is positive to the current direction of the second source, or, the setting of described and machine busbar electric current is in described and machine positive busbar The current direction that the second source flows to the first power supply is positive；

In the first possible implementation of the second aspect, the control equipment is specifically used for when described and machine is female When the electric current of row is greater than predetermined current, the output voltage for adjusting the second source increases, until described and machine busbar electric current It is consistent with the predetermined current；When described and machine busbar electric current is less than predetermined current, the output of the second source is adjusted Voltage reduces, until described and machine busbar electric current is consistent with the predetermined current.

In conjunction in second aspect and any of the above-described kind of possible implementation, in the second possible implementation, institute Control equipment is stated, specifically for by pid algorithm or obscuring according to the electric current of described and machine busbar and the difference of predetermined current Control algolithm adjusts the output voltage of the second source.

In conjunction in second aspect and any of the above-described kind of possible implementation, in the third possible implementation, institute State the managing apparatus that control equipment is the second source.

The third aspect provides a kind of parallel operation control system of DC power system, including following at least two power-supply system: First power supply and second source；It further include above-described control equipment.

In the first possible implementation of the third aspect, further includes: current detecting equipment；

The current detecting equipment, for detecting the electric current of described and machine busbar.

In conjunction in the third aspect and any of the above-described kind of possible implementation, in the second possible implementation, institute Stating current detecting equipment is Hall current sensor or current divider.

In conjunction in the third aspect and any of the above-described kind of possible implementation, in the third possible implementation, go back It include: overflow protecting element；

The overflow protecting element is connected with described and machine busbar.

In conjunction in the third aspect and any of the above-described kind of possible implementation, in the fourth possible implementation, institute Overflow protecting element is stated to include any of the following:

Contactor, air switch and fuse.Compared with prior art, the present invention has at least the following advantages:

DC power system provided by the present application and machine control method, in the direct current output of second source and the first power supply End is by the electric current of simultaneously machine busbar being compared with predetermined current, and according to comparison result when simultaneously machine busbar is connected in parallel The output voltage of second source is adjusted, until simultaneously the electric current of machine busbar is consistent with predetermined current.Due to the first power supply and the second electricity The DC output end in source is connected in parallel, and electric current flowing of the current response of machine busbar between second source and the first power supply Situation, for example, when the DC output voltage of second source is lower than the DC output voltage of the first power supply, and the electric current of machine busbar is First power supply flows to second source, and the voltage difference between two power-supply systems is bigger, and the electric current of machine busbar is bigger.Cause This can make the working condition of second source and the first power supply by the size and direction of control and the electric current of machine busbar Working condition is consistent, to realize that second source can follow the working condition of the first power supply.In the method, due to Two power supplys and the first power supply do not need to be communicated by communication protocol, thus avoid the agreement of second source and the first power supply Docking, signal docking and the work for developing new agreement and signaling interface；In addition, this method is according to the simultaneously electric current of machine busbar and in advance If the output voltage of the comparison result control second source of electric current, realization accurately control between second source and the first power supply Electric current avoids having a adverse impact to the first power supply.

Detailed description of the invention

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts, It can also be obtained according to these attached drawings other attached drawings.

Fig. 1 is the structural schematic diagram of a kind of second source and the first power sources in parallel；

Fig. 2 is the structural schematic diagram of another second source and the first power sources in parallel；

Fig. 3 is a kind of DC power system provided by the embodiments of the present application and machine control method flow chart；

Fig. 3 a is that the direct current provided by the embodiments of the present application for being higher than second source when the DC output voltage of the first power supply is defeated Current flow diagram when voltage out；

Fig. 3 b is provided by the embodiments of the present application when the DC output voltage of the first power supply is defeated lower than the direct current of second source Current flow diagram when voltage out；

Fig. 4 is another DC power system provided by the embodiments of the present application and machine control method flow chart；

Fig. 5 is another DC power system provided by the embodiments of the present application and machine control method flow chart；

Fig. 6 be it is provided by the embodiments of the present application it is a kind of using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the defeated of second source The method flow diagram that voltage is adjusted out；

Fig. 7 is that another kind provided by the embodiments of the present application utilizes pid algorithm or FUZZY ALGORITHMS FOR CONTROL to second source The method flow diagram that output voltage is adjusted；

Fig. 8 is a kind of structural schematic diagram of the parallel operation control system of DC power system provided by the embodiments of the present application；

Fig. 9 is the structural schematic diagram of the parallel operation control system of another DC power system provided by the embodiments of the present application；

Figure 10 is the structural schematic diagram of the parallel operation control system of another DC power system provided by the embodiments of the present application；

Figure 11 is the structural schematic diagram of the parallel operation control system of another DC power system provided by the embodiments of the present application.

Specific embodiment

In order to realize second source DC master row and the first power supply DC master row it is in parallel, simultaneously usually using following two Connection scheme.A kind of parallel arrangement and its scheme disadvantage are introduced first below.

Referring to Fig. 1, which is the structural schematic diagram of a kind of second source and the first power sources in parallel.

The DC output end of first power supply 101 and the DC output end of second source 102 are in parallel by simultaneously machine busbar, described And machine busbar includes simultaneously machine positive busbar 103a and simultaneously machine negative busbar 103b, i.e., the positive output end and second of described first power supply 101 The negative output terminal of power supply 102 is connected in parallel by simultaneously machine positive busbar 103a, the negative output terminal and second of first power supply 101 The negative output terminal of power supply 102 is connected in parallel by simultaneously machine negative busbar 103b.Moreover, second source 102 passes through communication data line 104 obtain the working condition of the first power supply 101.

In one implementation, described and machine positive busbar 103a can be copper wire with simultaneously machine negative busbar 103b.

For example, second source 102 is obtained by communication data line 104 when the first power supply 101 is in the working condition of floating charge The first power supply 101 is taken to be in the working condition of floating charge, then, second source 102 adjusts the work shape itself also to work in floating charge State, to be consistent with the working condition of the first power supply 101.

It should be noted that the working condition of power-supply system includes floating charge and fills, wherein float charge voltage is slightly above spare The voltage rating of battery, and even charging voltage is higher than float charge voltage.For example, the voltage rating of reserve battery is generally 48V, then floating charge Voltage is generally 53.5V, and even charging voltage is generally 56.4V.Above data only schematically illustrates, right in the embodiment of the present application It can be adjusted.

But the program has the disadvantage in that

Since the first power supply 101 and second source 102 are communicated by communication data line 104, thus, in order to complete the The docking of the communication protocol of one power supply 101 and second source 102 and signal docking, need to confirm the first power supply by staff 101 model, and match corresponding second source 102.

In addition, then needing to develop new communication protocol and signal when second source 102 and the first power supply 101 mismatch Interface increases power supply in order to complete the communication protocol docking and signal docking of the first power supply 101 and second source 102 The workload and work difficulty of System Expansion.

Another second source and the first power sources in parallel scheme and its scheme disadvantage is described below.

Referring to fig. 2, which is the structural schematic diagram of another second source and the first power sources in parallel.

The DC output end of first power supply 101 and the DC output end of second source 102 are in parallel by simultaneously machine busbar, described And machine busbar includes simultaneously machine positive busbar 103a and simultaneously machine negative busbar 103b.The positive output end and second of i.e. described first power supply 101 The negative output terminal of power supply 102 is connected in parallel by simultaneously machine positive busbar 103a, the negative output terminal and second of first power supply 101 The negative output terminal of power supply 102 is connected in parallel by simultaneously machine negative busbar 103b.Moreover, second source 102 is by monitoring in real time simultaneously The voltage of machine busbar obtains the working condition of the first power supply 101.

For example, second source 102 can pass through monitoring and machine mother when the first power supply 101 is in the working condition of floating charge The voltage of row obtains the working condition that the first power supply 101 is in floating charge, and the adjustment of second source 102 itself also works in the work of floating charge Make state, to be consistent with the working condition of the first power supply 101.

But the program has the disadvantage in that

It will lead to due to temperature drift or time drift etc. and the voltage of machine busbar generate drift and variation, so that the Two power supplys 102 can not obtain the accurate working condition of the first power supply 101, also can not accurately adjust second source 102 and be in the The working condition of one power supply 101 causes second source 102 that can not accurately follow the working condition of the first power supply 101.

In addition, when second source 102 accurately can not follow the first power supply 101, and the electric current of machine busbar may be folded It is added to the output electric current of the first power supply 101, the first power supply 101 function due to the change of electric current is caused to deteriorate, thus to the first electricity Source 101 generates adverse effect, such as battery charging overcurrent is excessive etc..

In order to solve the problems, such as that two above scheme exists, the embodiment of the present application provide a kind of DC power system and Machine control method, this method comprises: the electric current of simultaneously machine busbar is compared with predetermined current；According to and machine busbar electric current with The comparison result of predetermined current adjusts the output voltage of second source, until simultaneously the electric current of machine busbar is consistent with predetermined current.

DC power system provided by the embodiments of the present application and machine control method, by and machine busbar electric current and default electricity Stream is compared, and the output voltage of second source is adjusted according to comparison result, until the simultaneously electric current and predetermined current of machine busbar Unanimously.Since the DC output end of the first power supply and second source is connected in parallel, and the second electricity of the current response of machine busbar Electric current flowing situation between source and the first power supply, for example, the DC output voltage of second source is lower than the direct current of the first power supply When output voltage, and the electric current of machine busbar is that the first power supply flows to second source, and the voltage difference between two power-supply systems It is bigger, and the electric current of machine busbar is bigger.Therefore, by the size and direction of control and the electric current of machine busbar, second can be made The working condition of power supply and the working condition of the first power supply are always consistent, to realize that second source can follow the first electricity The working condition in source.In the method, it since second source and the first power supply do not have to be communicated by communication protocol, thus keeps away The agreement docking, signal docking and the work for developing new agreement and signaling interface of second source and the first power supply are exempted from；In addition, This method is realized accurately according to the output voltage of the simultaneously electric current of machine busbar and the comparison result of predetermined current control second source The electric current between second source and the first power supply is controlled, avoids having a adverse impact to the first power supply.

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.

Embodiment of the method one:

Referring to Fig. 3, which is a kind of DC power system provided by the embodiments of the present application and machine control method process Figure.

DC power system provided by the embodiments of the present application and machine control method, the DC power system include: One power supply and second source；This method comprises:

S301: the electric current of simultaneously machine busbar is compared with predetermined current.

Predetermined current can be set to 0, also can according to need and is set greater than zero but is less than one of preset value just Number, preset value can be a smaller numerical value, close to 0.The specific choice of preset value can be according to DC power system Device parameters and application scenarios be arranged, in the present embodiment without limitation.Ideally, predetermined current 0, i.e., first Electric current flowing is not present between power supply and second source mutually.Currently, there are Weak currents between the first power supply and second source Flowing can be ignored, and be considered as that there is no electric current flowings.

And machine busbar is for the DC output end of the DC output end of second source and the first power supply to be connected in parallel.And And and machine busbar include and machine positive busbar and and machine negative busbar.Wherein, the first power supply is as original power supply, second source conduct It is newly-increased to power up.In addition, the first power supply may include multiple power supplys, such as two power sources in parallel are together, but for this Shen Please be for embodiment, no matter original power supply specifically includes several power supplys, an equal collectively regarded as power supplys.Similarly, second source It is.

For the ease of explanation and understanding, the embodiment of the present application will be set with the electric current of simultaneously machine busbar with described and machine positive busbar Described in the first power supply flow to the second source current direction be positive for be illustrated.

Detailed explanation and description are carried out below in conjunction with Fig. 3 a and Fig. 3 b, wherein Fig. 3 a is that the figure is the embodiment of the present application The current flow diagram when the DC output voltage of the first power supply is higher than the DC output voltage of second source provided, figure When 3b is the DC output voltage provided by the embodiments of the present application for being lower than second source when the DC output voltage of the first power supply Current flow diagram.

In the DC power system of Fig. 3 a and Fig. 3 b, the DC output end of the first power supply 101 and second source 102 it is straight Stream output end is in parallel by simultaneously machine busbar, and described and machine busbar includes simultaneously machine positive busbar 103a and simultaneously machine negative busbar 103b.

When set using and machine positive busbar 103a in the first power supply 101 flow to second source 102 electric current flow direction as timing,

As shown in Figure 3a, if the DC output voltage of the first power supply 101 is higher than the DC output voltage of second source 102, Then and the electric current I in machine positive busbar 103a flows to second source 102 by the first power supply 101, at this point, simultaneously the electric current I of machine busbar is Just；

As shown in Figure 3b, if the DC output voltage of the first power supply 101 is lower than the DC output voltage of second source 102, Then and the electric current I of machine positive busbar 103a flows to the first power supply 101 by second source 102, at this point, simultaneously the electric current I of machine busbar is negative.

However, if simultaneously the electric current of machine busbar is equal to predetermined current, then it represents that the working condition of second source accurately reaches To preset working condition, it is not necessary to further adjust the output voltage of second source.

Predetermined current can be fixed value, or the function expression with time correlation.The expression side of predetermined current Formula is related to the operative scenario of second source and the first power supply, and different operative scenario predetermined currents uses different expression sides Formula.The expression way of the predetermined current under two kinds of different operating scenes will be successively introduced below.

The first, predetermined current is fixed value 0A.

Predetermined current is corresponding when keeping working condition consistent completely according to ideally second source and the first power supply Electric current, when two power-supply systems are consistent and when in stable state, the electric current of parallel busbar should be 0A, i.e. two electricity Mutual electric current flowing should be not present to be equal in the output voltage of source system between two power-supply systems.Certainly, due to reality When border works, for each power-supply system there may be slight fluctuation, which can be set to the range of fluctuating error permission, Such as control precision is no more than +/- the 1% of rated current.

Second, predetermined current is function expression.

Assuming that predetermined current is the ratio of pre-set constant power with simultaneously electromechanical pressure, and electromechanical using power limitation control scheme Pressure is the busbar voltage that the first power supply and second source are connected in parallel.

For example, working as pre-set constant power is redefined for P1, and current and electromechanical pressure is V1, then predetermined current I1 are as follows: I1 =P1/V1.

S302: the output electricity of second source is adjusted according to the simultaneously comparison result closed loop of the electric current of machine busbar and predetermined current Pressure, until simultaneously the electric current of machine busbar is consistent with predetermined current, so that the second source follows the work shape of first power supply State.

It should be noted that described in the present embodiment and the setting of the electric current of machine busbar is with described in described and machine positive busbar the The current direction that one power supply flows to the second source is positive, since described and machine busbar includes simultaneously machine positive busbar and the simultaneously negative mother of machine Row, the electric current when the current direction in simultaneously machine positive busbar is that the first power supply flows to second source, in corresponding and machine negative busbar Flow direction is that second source flows to the first power supply.It, can also be with it is understood that sense of current defined above is merely illustrative of The current direction that second source flows to the first power supply in the definition simultaneously machine positive busbar is positive.It is with simultaneously machine positive busbar above for ginseng Examine to and machine busbar electric current carry out definition, similarly, can also using and machine negative busbar be reference pair simultaneously machine busbar electric current into Row definition.

DC power system provided by the embodiments of the present application and machine control method, by and machine busbar electric current and default electricity Stream is compared, and the output voltage of second source is adjusted according to comparison result, until the simultaneously electric current and predetermined current of machine busbar Unanimously.Since the DC output end of the first power supply and second source is connected in parallel, and the second electricity of the current response of machine busbar Energy flow situation between source and the first power supply, for example, the DC output voltage of second source is lower than the direct current of the first power supply When output voltage, and the electric current of machine busbar is that the first power supply flows to second source, and the voltage difference between two power-supply systems It is bigger, and the electric current of machine busbar is bigger.Therefore, by the size and direction of control and the electric current of machine busbar, second can be made The working condition of power supply and the working condition of the first power supply are consistent, to realize that second source can follow the first power supply Working condition.In the method, it since second source and the first power supply do not have to be communicated by communication protocol, thus avoids The docking of the agreement of second source and the first power supply, signal docking and the work for developing new agreement and signaling interface；In addition, the party Method controls the output voltage of second source according to the simultaneously electric current of machine busbar and the comparison result of predetermined current, and realization accurately controls Electric current between second source and the first power supply avoids having a adverse impact to the first power supply.

In order to enable the working condition of second source can more accurately follow the working condition of the first power supply, the application is real A kind of example additionally provides DC power system and machine control method is applied, is explained and illustrated below in conjunction with attached drawing.

Embodiment of the method two:

Embodiment second is that improve on the basis of example 1, thus, the part of embodiment two and embodiment one Content is identical, and details are not described herein for same section.

Referring to fig. 4, which is another DC power system provided by the embodiments of the present application and machine control method stream Cheng Tu.

DC power system provided by the embodiments of the present application and machine control method, can specifically include:

S401: comparing and whether the electric current of machine busbar is equal to predetermined current, if so, executing S405；If it is not, then executing S402。

As an example, if presetting predetermined current is that 0, S401 can be with specifically: compare and the electric current of machine busbar is It is no to be equal to 0, if simultaneously the electric current of machine busbar is equal to 0, then it represents that the output voltage of second source is equal to the output electricity of the first power supply Pressure, so that the working condition of second source accurately follows the working condition of the first power supply, at this point, second source should be kept Current output voltage；If simultaneously the electric current of machine busbar is not equal to 0, then it represents that the output voltage of second source is higher or lower than first The output voltage of power supply, so that the working condition of second source and the working condition of the first power supply are inconsistent, at this point it is possible to pass through The output voltage of second source is adjusted to adjust the working condition of second source.

S402: comparing and whether the electric current of machine busbar is greater than predetermined current, if so, executing S403；If it is not, then executing S404。

And the electric current of machine busbar is greater than the electric current for the pressure regulation scheme and simultaneously machine busbar taken when predetermined current less than default electricity The pressure regulation scheme taken when stream is different.

For example, when and machine busbar electric current be greater than predetermined current when, then it represents that the output voltage of second source be lower than first The output voltage of power supply, at this point, pressure regulation scheme may is that the output voltage for increasing second source, until the output of second source Voltage is equal to the output voltage of the first power supply, so that simultaneously the electric current of machine busbar is equal to predetermined current.

When and the electric current of machine busbar be less than predetermined current when, then it represents that the output voltage of second source is higher than first power supply Output voltage, at this point, pressure regulation scheme may is that the output voltage for reducing second source, until the output voltage etc. of second source In the output voltage of the first power supply, so that simultaneously the electric current of machine busbar is equal to predetermined current.

S403: the output voltage for adjusting second source increases, until simultaneously the electric current of machine busbar is consistent with predetermined current.

S404: the output voltage for adjusting second source reduces, until simultaneously the electric current of machine busbar is consistent with predetermined current.

S405: keeping the current output voltage of second source, without any adjusting.

In addition, the load that provided by the embodiments of the present application and machine control method is also applied for second source and the first power supply is The application scenarios of constant power load.

But due under the application scenarios, load required power be it is constant so that second source and the first power supply Output power be also it is constant, thus, when the output voltage of second source being adjusted under the application scenarios, need elder generation Current preset electric current is obtained according to pre-set constant power, is adjusted further according to output voltage of the predetermined current to second source. This method is described in detail below.

It is which provides another DC power system for the application embodiment of the method and machine control method referring to Fig. 5 Flow chart.

S501: acquisition and electromechanical pressure and the simultaneously electric current of machine busbar.

And electromechanical pressure is the output voltage that the first power supply and second source are connected in parallel.

Since the DC output end of the first power supply and the DC output end of second source are connected in parallel by simultaneously machine busbar, Thus, when the working condition of second source accurately follows the working condition of the first power supply, and electromechanical pressure can be the first electricity The output voltage in source is also possible to the output voltage of second source.

S502: according to the ratio of pre-set constant power and simultaneously electromechanical pressure, predetermined current is obtained.

Pre-set constant power is fixed value, and pre-set constant power can carry out really according to the power needed for constant power load It is fixed.

Predetermined current can be the ratio of pre-set constant power and simultaneously electromechanical pressure.For example, when the first power supply and second source The output voltage being connected in parallel is V2, and when pre-set constant power is P2, then predetermined current I2 are as follows: I2=P2/V2.

It should be noted that due to and electromechanical pressure be with time change, thus, according to pre-set constant power with and machine The predetermined current that the ratio of voltage obtains is also with time change.

The content and S401 of S503 to S507 is identical as the content of S405, and details are not described herein.

DC power system provided by the embodiments of the present application and machine control method, according to and the electric current of machine busbar and default The difference of electric current takes the output voltage of different scheme adjusting second sources, so that the working condition of second source and the first electricity The working condition in source is always consistent, further improve control second source follow the first power supply working condition it is accurate Property.

In addition, in order to further increase control second source working condition follow the first power supply working condition it is accurate Property, in provided by the embodiments of the present application and machine control method, the adjusting method of the output voltage of second source can be with specifically: Pass through pid calculation (Proportional Integral according to the simultaneously difference of the electric current of machine busbar and predetermined current Differential, PID) algorithm or FUZZY ALGORITHMS FOR CONTROL adjust the output voltage of second source.

It is described in detail below and the output voltage of second source is adjusted using pid algorithm or FUZZY ALGORITHMS FOR CONTROL Method.

Referring to Fig. 6, which is a kind of utilization pid algorithm provided by the embodiments of the present application or FUZZY ALGORITHMS FOR CONTROL to second The method flow diagram that the output voltage of power supply is adjusted.

The side shown in fig. 6 that the output voltage of second source is adjusted using pid algorithm or FUZZY ALGORITHMS FOR CONTROL Method, can be with specifically:

The first step, it is poor that the simultaneously electric current of machine busbar and predetermined current are made, and obtains current differential.If current differential is 0, Terminate to adjust；If current differential is not 0, second step is executed.

Second step, according to current differential, using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the output voltage of second source into Row is adjusted.

Third step, according to the output voltage of the output voltage of the second source after adjusting and the first power supply, after obtaining adjusting And machine busbar electric current.

4th step executes the first step according to after adjusting and machine busbar electric current.

Above-mentioned adjusting method, by utilizing pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the output voltage weight of second source Be adjusted again so that simultaneously the electric current of machine busbar moves closer to predetermined current, until and the electric current of machine busbar be equal to predetermined current Then terminate to adjust, thus, this method can with the output voltage of more precise control second source, thus, further improve control The working condition of second source processed follows the accuracy of the working condition of the first power supply.

It should be noted that in the case where the load of second source and the first power supply is the application scenarios of constant power load, it can also The output voltage of second source to be adjusted using pid algorithm or FUZZY ALGORITHMS FOR CONTROL.It is described in detail below at this The method that the output voltage of second source is adjusted using pid algorithm or FUZZY ALGORITHMS FOR CONTROL under application scenarios.

Referring to Fig. 7, the figure be it is provided by the embodiments of the present application it is another using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the The method flow diagram that the output voltage of two power supplys is adjusted.

The side shown in Fig. 7 that the output voltage of second source is adjusted using pid algorithm or FUZZY ALGORITHMS FOR CONTROL Method, can be with specifically:

The first step obtains the output power of simultaneously machine busbar according to simultaneously electromechanical pressure and the simultaneously electric current of machine busbar.

Second step, it is poor that the output power of pre-set constant power and simultaneously machine busbar is made, and obtains power difference.If difference power Value is 0, then terminates to adjust；If power difference is not 0, third step is executed.

Third step obtains predetermined current using pid algorithm or FUZZY ALGORITHMS FOR CONTROL according to power difference.

4th step, it is poor that the simultaneously electric current of machine busbar and predetermined current are made, and obtains current differential.

5th step, according to current differential, using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the output voltage of second source into Row is adjusted.

6th step, according to the output voltage of the output voltage of the second source after adjusting and the first power supply, after obtaining adjusting And the electric current of machine busbar and and electromechanical pressure.

7th step presses with simultaneously electromechanical according to after adjusting and machine busbar electric current, executes the first step.

Above-mentioned adjusting method first passes through and obtains current preset electric current using pid algorithm or FUZZY ALGORITHMS FOR CONTROL, then leads to It crosses the output voltage of second source is repeated to adjust using pid algorithm or FUZZY ALGORITHMS FOR CONTROL, so that simultaneously machine busbar Electric current moves closer to predetermined current, until and the electric current of machine busbar be equal to predetermined current and then terminate to adjust, thus, this method can be with The output voltage of more precise control second source, thus, the working condition for further improving control second source follows the The accuracy of the working condition of one power supply.

Provided by the embodiments of the present application and machine control method can be applied to be under different working condition when the first power supply When, the adjusting to the working condition of second source.It will be successively introduced below when the first power supply is in different working condition, second The pressure regulation process of power supply.

When the first power supply is in floating charge state, if simultaneously the electric current of machine busbar is greater than predetermined current, the second electricity is turned up The output voltage in source, so that simultaneously the electric current of machine busbar is reduced to predetermined current；If simultaneously the electric current of machine busbar is less than predetermined current, The output voltage of second source is then reduced, so that simultaneously the electric current of machine busbar increases to predetermined current.When second source completes pressure regulation After process, and the electric current of machine busbar is equal to predetermined current.

When the first power supply, which is in, fills state, if simultaneously the electric current of machine busbar is greater than predetermined current, the second electricity is turned up The output voltage in source, so that simultaneously the electric current of machine busbar is reduced to predetermined current；If simultaneously the electric current of machine busbar is less than predetermined current, The output voltage of second source is then reduced, so that simultaneously the electric current of machine busbar increases to predetermined current.When second source completes pressure regulation After process, and the electric current of machine busbar is equal to predetermined current.

When the first power supply is converted by floating charge state to when filling state, the output voltage of the first power supply increases, and leads to first The electric current that power supply flows to second source increases, at this point, simultaneously the electric current of machine busbar is greater than predetermined current, therefore, it is possible to be turned up second The output voltage of power supply, so that simultaneously the electric current of machine busbar is reduced to predetermined current, thus, the electric current etc. of simultaneously machine busbar is kept again In the state of predetermined current.

When the first power supply is converted by the state of filling to floating charge state, the output voltage of the first power supply is reduced, and leads to first The electric current that power supply flows to second source reduces.At this point, simultaneously the electric current of machine busbar is less than predetermined current, therefore, it is possible to reduce by second The output voltage of power supply, so that simultaneously the electric current of machine busbar increases to predetermined current, thus, the electric current etc. of simultaneously machine busbar is kept again In the state of predetermined current.

DC power system provided by the embodiments of the present application and machine control method, can be in first power supply in difference When working condition, the output of different schemes adjusting second sources is taken from the difference of predetermined current according to the simultaneously electric current of machine busbar Voltage further improves control so that the working condition of second source and the working condition of the first power supply are always consistent Second source follows the accuracy of the working condition of the first power supply.

Based on a kind of DC power system provided above and machine control method, the embodiment of the present application also provides one kind DC power system and machine control equipment, be explained and illustrated below in conjunction with apparatus embodiments.

Apparatus embodiments:

DC power system provided by the embodiments of the present application and machine control equipment, the DC power system includes: the The DC output end of one power supply and second source, second source and the first power supply is connected in parallel by simultaneously machine busbar；

Equipment is controlled, for the electric current of simultaneously machine busbar to be compared with predetermined current；And according to the electric current of simultaneously machine busbar The output voltage of second source is adjusted with the comparison result of predetermined current, until simultaneously the electric current of machine busbar is consistent with predetermined current, So that the second source accurately follows the working condition of first power supply.

Described and machine busbar includes simultaneously machine positive busbar and simultaneously machine negative busbar；The setting of described and machine busbar electric current with it is described simultaneously The current direction that the first power supply flows to the second source described in machine positive busbar is positive, or, described and machine busbar electric current is set It is fixed to be positive with the current direction that second source described in described and machine positive busbar flows to the first power supply；

The working condition of control equipment control second source provided by the embodiments of the present application accurately follows the work of the first power supply Make the process of state, it can be with specifically:

Firstly, the electric current of simultaneously machine busbar is compared by control equipment with predetermined current.

Secondly, control equipment needs to take corresponding control according to the simultaneously electric current of machine busbar and the comparison result of predetermined current Means processed control the output voltage of second source accordingly, so that simultaneously the electric current of machine busbar is equal to predetermined current.

The different control means for controlling equipment and taking according to different comparison results will be successively introduced below.

If simultaneously the electric current of machine busbar is equal to predetermined current, controls equipment and abandon control to second source, so that the Two power supplys keep current working status.

If simultaneously the electric current of machine busbar is greater than predetermined current, the output voltage increasing that equipment needs to control second source is controlled Greatly, until and machine busbar electric current be equal to predetermined current when finishing control, thus, so that the working condition of second source is accurate Follow the working condition of the first power supply.

If simultaneously the electric current of machine busbar is less than predetermined current, controls equipment and need to control the output voltage of second source and subtract It is small, until finishing control when simultaneously the electric current of machine busbar is equal to predetermined current, thus, so that the working condition of second source is accurate Follow the working condition of the first power supply.

In addition, control equipment is also needed according to default when the load of second source and the first power supply is constant power load The ratio acquisition predetermined current of firm power and simultaneously electromechanical pressure, in order to control equipment according to the simultaneously electric current of machine busbar and default electricity The comparison result of stream takes corresponding control means to the output voltage of second source.

In order to enable control equipment carries out more precise control to the output voltage of second source, the embodiment of the present application is provided Control equipment when the output voltage for controlling second source increases or reduces, can also according to and the electric current of machine busbar and default The difference of electric current adjusts the output voltage of second source, the specific course of work by pid algorithm or FUZZY ALGORITHMS FOR CONTROL It can be with are as follows:

The first step, it is poor that control equipment makees the simultaneously electric current of machine busbar and predetermined current, obtains current differential.If current difference Value is 0, then controls equipment and abandon control to second source；If current differential is not 0, controls equipment and execute second step.

Second step controls equipment according to current differential, using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the defeated of second source Voltage is adjusted out, in order to obtain according to the output voltage of the output voltage of the second source after adjusting and the first power supply After adjusting and machine busbar electric current.

Third step controls equipment according to after adjusting and machine busbar electric current, re-executes the first step.

In this way, the control equipment can be by electric to the output of second source using pid algorithm or FUZZY ALGORITHMS FOR CONTROL Ballast is adjusted again so that simultaneously the electric current of machine busbar moves closer to predetermined current, until and machine busbar electric current be equal to it is default Electric current then finishing control, thus, the equipment can with the output voltage of more precise control second source, thus, further increase The working condition of control second source follows the accuracy of the working condition of first power supply.

In addition, control equipment also needs to calculate using PID when the load of second source and the first power supply is constant power load Method or FUZZY ALGORITHMS FOR CONTROL obtain predetermined current, in order to control equipment according to the simultaneously electric current of machine busbar and the ratio of predetermined current Compared with as a result, take corresponding control means to the output voltage of second source, the specific course of work can be with are as follows:

The first step controls equipment according to simultaneously electromechanical pressure and the simultaneously electric current of machine busbar, obtains the output power of simultaneously machine busbar.

Second step, it is poor that control equipment needs the output power by pre-set constant power and simultaneously machine busbar to make, and obtains difference power Value.If power difference is 0, controls equipment and abandon control to second source；If power difference is not 0, control is set It is standby to execute third step.

Third step, control equipment obtain predetermined current according to power difference, using pid algorithm or FUZZY ALGORITHMS FOR CONTROL.

4th step, it is poor that control equipment needs to make in the simultaneously electric current of machine busbar and predetermined current, obtains current differential.

5th step controls equipment according to current differential, using pid algorithm or FUZZY ALGORITHMS FOR CONTROL to the defeated of second source Voltage is adjusted out, in order to obtain according to the output voltage of the output voltage of the second source after adjusting and the first power supply After adjusting and machine busbar electric current and and electromechanical pressure.

7th step, control equipment is electromechanical according to after adjusting and machine busbar electric current and simultaneously to press, and re-executes the first step.

In this way, control equipment first passes through and obtains current preset electric current using pid algorithm or FUZZY ALGORITHMS FOR CONTROL, then pass through The output voltage of second source is repeated to adjust using pid algorithm or FUZZY ALGORITHMS FOR CONTROL, so that the simultaneously electricity of machine busbar Stream moves closer to predetermined current, until and the electric current of machine busbar be equal to predetermined current then finishing control, thus, which can be more It is accurately controlled the output voltage of second source, thus, the working condition for further improving control second source follows first The accuracy of the working condition of power supply.

In addition, DC power system provided by the embodiments of the present application and machine control equipment, can for independently of second electricity The controller of source or the first power supply, or the managing apparatus of second source.

When DC power system and machine control equipment be second source managing apparatus when, due to second source Managing apparatus can execute the work of control equipment, thus, when second source and the first power supply are carried out simultaneously machine, without increasing Add independent controller, simplifies second source and the first power supply carries out and machine operation, reduce second source and the first power supply Carry out and machine cost and reduce and machine after second source and the first power supply volume.

DC power system provided by the embodiments of the present application and machine control equipment, by and machine busbar electric current and default electricity Stream is compared, and the output voltage of second source is adjusted according to comparison result, until the simultaneously electric current and predetermined current of machine busbar Unanimously.Since the DC output end of the first power supply and second source is connected in parallel, and the second electricity of the current response of machine busbar Electric current flowing situation between source and the first power supply, for example, the DC output voltage of second source is lower than the direct current of the first power supply When output voltage, and the electric current of machine busbar is that the first power supply flows to second source, and the voltage difference between two power-supply systems It is bigger, and the electric current of machine busbar is bigger.Therefore, by the size and direction of control and the electric current of machine busbar, second can be made The working condition of power supply and the working condition of the first power supply are always consistent, to realize that second source can follow the first electricity The working condition in source.In the control equipment, since second source and the first power supply do not have to be communicated by communication protocol, because And avoid the agreement docking, signal docking and the work for developing new agreement and signaling interface of second source and the first power supply； In addition, output voltage of the control equipment according to the simultaneously electric current of machine busbar and the comparison result of predetermined current control second source, It realizes the electric current accurately controlled between second source and the first power supply, avoids having a adverse impact to the first power supply.

Based on a kind of DC power system provided above and machine control method and a kind of DC power system and Machine controls equipment, and the embodiment of the present application also provides a kind of parallel operation control systems of DC power system, below in conjunction with attached drawing It is explained and illustrated.

System embodiment one:

Referring to Fig. 8, which is a kind of structure of the parallel operation control system of DC power system provided by the embodiments of the present application Schematic diagram.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: first the 101, second electricity of power supply Source 102 and control equipment 801 provided by the above embodiment.

Wherein, the DC output end of the DC output end of the first power supply 101 and second source 102 is in parallel by simultaneously machine busbar Together.Described and machine busbar includes simultaneously machine positive busbar 103a and simultaneously machine negative busbar 103b.I.e. described first power supply 101 it is just defeated The negative output terminal of outlet and second source 102 is connected in parallel by simultaneously machine positive busbar 103a, and bearing for first power supply 101 is defeated The negative output terminal of outlet and second source 102 is connected in parallel by simultaneously machine negative busbar 103b.

Control equipment 801 can be communicated with second source 102, control second source 102 in order to control equipment 801 Output voltage adjusting.

The course of work of the parallel operation control system of DC power system provided by the embodiments of the present application are as follows:

Firstly, controlling electric current and predetermined current that equipment 801 obtains simultaneously machine busbar, and by the simultaneously electric current of machine busbar and preset Electric current is compared.

Then, control equipment 801 adjusts second source 102 according to the simultaneously electric current of machine busbar and the comparison result of predetermined current Output voltage so that simultaneously machine busbar electric current is consistent with predetermined current.

It should be noted that control equipment 801 can be the controller independently of second source or the first power supply, it can also be with For the managing apparatus of second source 102.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: first the 101, second electricity of power supply Source 102 and control equipment 801, control equipment 801 by by and the electric current of machine busbar be compared with predetermined current, and according to than Relatively result adjusts the output voltage of second source 102, until simultaneously machine busbar electric current is consistent with predetermined current, so that second source 102 working condition and the working condition of the first power supply 101 are always consistent, to realize that second source 102 can follow The working condition of first power supply 101.Within the system, since second source 102 and the first power supply 101 do not have to pass through communication protocol It is communicated, thus avoids the agreement docking of second source 102 and the first power supply 101, signal docking and develop new agreement With the work of signaling interface；In addition, the system is according to the second electricity of the simultaneously electric current of machine busbar and the control of the comparison result of predetermined current The output voltage in source 102 realizes the electric current accurately controlled between second source 102 and the first power supply 101, avoids to the first electricity Source 101 has a adverse impact.

In order to improve DC power system parallel operation control system safety, the embodiment of the present application also provides other one The parallel operation control system of kind DC power system, is explained and illustrated below in conjunction with attached drawing.

System embodiment two:

Referring to Fig. 9, which is the knot of the parallel operation control system of another DC power system provided by the embodiments of the present application Structure schematic diagram.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: first the 101, second electricity of power supply Source 102, a kind of above-mentioned control equipment 801 and current detecting equipment 901.

Control equipment 801 can be communicated with second source 102, control second source 102 in order to control equipment 801 Output voltage adjusting, and control equipment 801 can also be communicated with current detecting equipment 901, in order to control equipment 801 obtain the electric current of simultaneously machine busbar.

Current detecting equipment 901, for detecting the electric current of simultaneously machine busbar.

Since in the power supply system for communications, power-supply system is usually positive ground connection, therefore, the general position of current detecting equipment Yu Bingji negative busbar side.

In order to improve the accuracy for detecting the simultaneously electric current of machine busbar, current detecting equipment 901 can be Hall current sensing Device is also possible to current divider.

The course of work of parallel operation control system provided by the embodiments of the present application are as follows:

Current detecting equipment 901 obtains and the electric current of machine busbar, and described and machine busbar electric current is sent to the control Equipment 801.

Control equipment 801 compares and the electric current and predetermined current of machine busbar, according to the electric current and predetermined current of simultaneously machine busbar Comparison result adjust second source 102 output voltage so that simultaneously machine busbar electric current is consistent with predetermined current.

In addition, in order to improve the safety of parallel operation control system, parallel operation control system provided by the embodiments of the present application may be used also To include: overflow protecting element, wherein overflow protecting element is connected with simultaneously machine busbar.Due in the power supply system for communications, power supply system Be positive ground connection as unified, and therefore, the overcurrent protective device is generally series at and machine negative busbar side.

In order to further increase the safety of parallel operation control system, overflow protecting element can be contactor, or Air switch can also be fuse.

It is illustrated so that overflow protecting element is air switch as an example below.

Referring to Figure 10, which is the knot of the parallel operation control system of another DC power system provided by the embodiments of the present application Structure schematic diagram.

The parallel operation control system of the DC power system of Figure 10, comprising: the first power supply 101, second source 102, control are set Standby 801, current detecting equipment 901 and air switch 1001.

The effect of air switch 1001 specifically: when and machine busbar electric current it is smaller when, air switch 1001 be closed, circuit Conducting；When and the electric current of machine busbar meet the disconnection condition of air switch when, air switch 1001 disconnects, circuit breaker, thus Achieve the purpose that isolated DC power system failure.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: first the 101, second electricity of power supply Source 102, control equipment 801, current detecting equipment 901 and overflow protecting element, the system utilize overflow protecting element by simultaneously machine The current control of busbar in safe range so that the operating current of the parallel operation control system of DC power system is in safe model In enclosing, thus, the destruction of electric current outside safe range to the parallel operation control system of DC power system is avoided, to reach guarantor Protect the purpose of the parallel operation control system of DC power system.

In order to simplify DC power system parallel operation control system structure and reduce production cost, the embodiment of the present application is also A kind of parallel operation control system of DC power system is provided, is explained and illustrated below in conjunction with attached drawing.

System embodiment three:

Referring to Figure 11, which is the knot of the parallel operation control system of another DC power system provided by the embodiments of the present application Structure schematic diagram.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: the first power supply 101 and the second electricity Source 102, wherein second source 102 includes managing apparatus 102a.

The DC output end of first power supply 101 and the DC output end of second source 102 are connected in parallel on one by simultaneously machine busbar It rises.Described and machine busbar includes simultaneously machine positive busbar 103a and simultaneously machine negative busbar 103b.The positive output end of i.e. described first power supply 101 It is connected in parallel with the negative output terminal of second source 102 by simultaneously machine positive busbar 103a, the negative output terminal of first power supply 101 It is connected in parallel with the negative output terminal of second source 102 by simultaneously machine negative busbar 103b.

Managing apparatus 102a is used to for the electric current of simultaneously machine busbar being compared with predetermined current, and female according to simultaneously machine The electric current of row and the comparison result of predetermined current adjust the output voltage of second source 102, until and the electric current of machine busbar and pre- If electric current is consistent.

The parallel operation control system of DC power system provided by the embodiments of the present application, comprising: the first power supply 101 and the second electricity Source 102, wherein the managing apparatus 102a of second source 102 is used to compare the electric current of simultaneously machine busbar with predetermined current Compared with, and according to the output voltage of the simultaneously electric current of machine busbar and the comparison result of predetermined current adjusting second source, until and machine The electric current of busbar is consistent with predetermined current.Within the system, since the managing apparatus 102a of second source 102 executes control The work of equipment, thus, the system without installing an independent control equipment, and then simplify DC power system and machine The structure of control system, also reduces production cost.

It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c (a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also To be multiple.

More than, it is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Although this Invention has been disclosed in a preferred embodiment above, and however, it is not intended to limit the invention.Anyone skilled in the art, It does not depart under technical solution of the present invention ambit, all using the methods and technical content of the disclosure above to the technology of the present invention side Case makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all without departing from the present invention The content of technical solution, according to the technical essence of the invention it is made to the above embodiment it is any it is simple modification, equivalent variations and Modification, all of which are still within the scope of protection of the technical scheme of the invention.

Claims

1. a kind of DC power system and machine control method, the DC power system include: the first power supply and second source； It is characterized in that, the DC output end of the second source and the first power supply is connected in parallel by simultaneously machine busbar, this method packet It includes:

Described and machine busbar electric current is compared with predetermined current；Described and machine busbar includes and machine positive busbar and simultaneously machine are negative Busbar；Described and machine busbar electric current setting flows to the electricity of the second source with the first power supply described in described and machine positive busbar Stream flow direction is positive, or, the setting of described and machine busbar electric current flows to the first electricity with second source described in described and machine positive busbar The current direction in source is positive；

The output voltage of the second source is adjusted according to the comparison result of described and machine busbar electric current and predetermined current, until Described and machine busbar electric current is consistent with the predetermined current, so that the second source follows the work shape of first power supply State.

2. the method according to claim 1, wherein the predetermined current is fixed value.

3. the method according to claim 1, wherein the predetermined current is that pre-set constant power is pressed with simultaneously electromechanical Ratio, described and electromechanical pressure is the output voltage that is connected in parallel of first power supply and second source.

4. according to the method in claim 2 or 3, which is characterized in that according to described and machine busbar electric current and predetermined current Comparison result adjust the output voltage of the second source, until described and machine busbar electric current and the predetermined current one It causes, specifically includes:

When described and machine busbar electric current is greater than predetermined current, the output voltage for adjusting the second source increases, until institute It states and the electric current of machine busbar is consistent with the predetermined current；

When described and machine busbar electric current is less than predetermined current, the output voltage for adjusting the second source reduces, until institute It states and the electric current of machine busbar is consistent with the predetermined current.

5. according to the method in claim 2 or 3, which is characterized in that according to described and machine busbar electric current and predetermined current Comparison result adjust the output voltage of the second source, specifically include:

It by pid calculation pid algorithm or is obscured according to the difference of described and machine busbar electric current and predetermined current Control algolithm adjusts the output voltage of the second source.

6. a kind of DC power system and machine control equipment, which is characterized in that the DC power system includes: the first power supply And second source；The DC output end of the second source and the first power supply is connected in parallel by simultaneously machine busbar；

The control equipment, for described and machine busbar electric current to be compared with predetermined current；Described and machine busbar includes And machine positive busbar and and machine negative busbar；Described and machine busbar electric current setting is with the first power flow described in described and machine positive busbar It is positive to the current direction of the second source, or, the setting of described and machine busbar electric current is described in described and machine positive busbar The current direction that second source flows to the first power supply is positive；

7. control equipment according to claim 6, which is characterized in that the control equipment is specifically used for when described and machine When the electric current of busbar is greater than predetermined current, the output voltage for adjusting the second source increases, until described and machine busbar electricity It flows consistent with the predetermined current；When described and machine busbar electric current is less than predetermined current, the defeated of the second source is adjusted Voltage reduces out, until described and machine busbar electric current is consistent with the predetermined current.

8. control equipment according to claim 6, which is characterized in that the control equipment is specifically used for according to simultaneously The electric current of machine busbar and the difference of predetermined current adjust the output of the second source by pid algorithm or FUZZY ALGORITHMS FOR CONTROL Voltage.

9. control equipment according to claim 7 or 8, which is characterized in that the control equipment is the second source Managing apparatus.

10. a kind of parallel operation control system of DC power system, which is characterized in that including following at least two power-supply system: the One power supply and second source；It further include the described in any item control equipment of claim 6-9.

11. control system according to claim 10, which is characterized in that further include: current detecting equipment；

12. control system according to claim 11, which is characterized in that the current detecting equipment is Hall current sensing Device or current divider.

13. control system according to claim 10, which is characterized in that further include: overflow protecting element；

The overflow protecting element is connected with described and machine busbar.

14. control system according to claim 13, which is characterized in that the overflow protecting element includes following any one Kind:

Contactor, air switch and fuse.