CN104701974B - A kind of control method of parallel connection power supply conversion equipment and parallel connection power supply conversion equipment - Google Patents
A kind of control method of parallel connection power supply conversion equipment and parallel connection power supply conversion equipment Download PDFInfo
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- CN104701974B CN104701974B CN201510160923.8A CN201510160923A CN104701974B CN 104701974 B CN104701974 B CN 104701974B CN 201510160923 A CN201510160923 A CN 201510160923A CN 104701974 B CN104701974 B CN 104701974B
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Abstract
The invention discloses a kind of control method of parallel connection power supply conversion equipment, belong to low voltage electrical apparatus technology field.The larger deficiency of Alloy White Iron existing for the existing automatic power converting system with translation function in parallel for the present invention, provide a kind of parallel connection switching control method, its thinking is after being connected to parallel connection outside conversion instruction and determining that the phase sequence of two-way power supply, voltage difference, difference on the frequency meet default requirement, it is not immediately performed conversion in parallel, but the switch period most preferably in parallel making Alloy White Iron minimum is selected according to the phase contrast of two-way power supply, carry out conversion in parallel in this period.The invention also discloses a kind of parallel connection power supply conversion equipment and a kind of power-supply system.Compared to existing technology, the present invention can effectively reduce Alloy White Iron during two-way power sources in parallel, improves security of system, and realizes simple, and range of application is wider.
Description
Technical field
The present invention relates to a kind of control method of parallel connection power supply conversion equipment and parallel connection power supply conversion equipment, belong to low tension
Device technical field.
Background technology
Automatic transferring switch of power supply is widely used in industrial power supply system, but in the case of two power supply two load,
If in the case of normal power supply, two-way power supply individually supplies electricity to two-way load, if breaking down in any road, existing most
Number automatic transferring switch of power supply cannot make another road power supply not broken down supply electricity to two-way load simultaneously, causes this road to load
Electric work cannot be obtained.
In order to solve the above problems, one mother of bridging switch can be executed, by adopting between the input side of two-way load
The system being formed with relay with PLC controls two power supply execution switches and the mode of mother execution switch to realize.Due to logical
Frequently with first dividing the conversion regime closing afterwards, first disconnect trouble power executes switch, then controls mother execution switch closure,
So may result in the of short duration power-off of load.
But higher industry, such as petrochemical industry, telecommunications, hospital etc. are required to power supply continuity at some, once power-off
Heavy losses can be caused, therefore, this kind of occasion needs a kind of power conversion system of uninterrupted switching.In order to realize uninterruptedly cutting
Change power supply, can be using first closing the conversion regime in parallel dividing afterwards, that is, first closure mother executes switch, is then turned off holding of trouble power
Row switch.But this uninterrupted Switching power needs phase sequence, voltage difference, difference on the frequency, phase contrast to meet condition could be changed, tradition
The system of PLC and relay composition cannot realize.
At present, the existing automatic power converting system with translation function in parallel is capable of uninterrupted Switching power, its
By judging to the phase sequence of two-way power supply, voltage difference, difference on the frequency, phase contrast, only when the condition is satisfied could be using first closing
The conversion regime in parallel dividing afterwards is changed, and when the threshold value setting is larger, Alloy White Iron when in parallel can be larger, can affect two
The normal work of road power supply, when the threshold value setting is less, easily causes the failure of two-way power sources in parallel.
Content of the invention
The technical problem to be solved is to overcome prior art not enough, provides a kind of parallel connection power supply conversion equipment
Control method and parallel connection power supply conversion equipment, can effectively reduce Alloy White Iron during power sources in parallel, improve the safety of system
Reliability.
The present invention specifically employs the following technical solutions：
A kind of control method of parallel connection power supply conversion equipment, described parallel connection power supply conversion equipment includes the first power input
End, second source input, the first outfan, the second outfan, first execute switch, second execute switch, mother execution open
Pass, control unit, the first execution switch is series between the first power input and the first outfan, the second execution switch series connection
Between second source input and the second outfan, mother execution switch be connected across the first outfan and the second outfan it
Between, control unit can execute to first respectively switch, second execute switch, mother execution switch be controlled；Described control is single
Unit, after the conversion instruction in parallel being connected to outside, carries out conversion and control in parallel in accordance with the following methods：The first power input with
The input phase sequence of second source input, the difference of input voltage, the difference of incoming frequency are satisfied by the feelings of default parallel connection switch condition
Under condition, control unit calculates and the initial time of parallel connection can be made to be located at the first power input and second source input
Input same phase at conversion reclosing command in parallel send the moment, conversion separating brake instruction in parallel sends the moment, and respectively in institute
State that conversion reclosing command in parallel sends the moment, conversion separating brake instruction in parallel sends and constantly sends conversion reclosing command in parallel, parallel connection
Conversion separating brake instruction.
Preferably, the input phase of the first power input according to real-time detection for the control unit and second source input
The described conversion reclosing command in parallel of difference calculating sends the moment, conversion separating brake in parallel instructs and sends the moment.
Further, the idiographic flow of described parallel connection conversion and control is as follows：
Step 1, judge whether following condition is met simultaneously：First power input is defeated with second source input
Enter that phase sequence is identical, the first power input is less than predeterminated voltage difference limen value with the difference of the input voltage of second source input, the
One power input is less than predeterminated frequency difference limen value with the difference of the incoming frequency of second source input；In this way, then 2 are gone to step,
As no, then convert failed in parallel；
Step 2, risen using the input voltage zero crossing of the first power input or second source input as epicycle timing
Begin the moment, and the input phase difference ΔΦ in this moment real-time detection first power input and second source input；Control
Unit calculates from epicycle timing initial time to the first power input according to following two formulas and second source input respectively
The input same phase moment between duration t3, and send conversion combined floodgate in parallel from epicycle timing initial time to controller and refer to
Make the duration t4 between the moment：
T4=t3-t2
Wherein, Δ f is the input power difference on the frequency of the first power input and second source input, and t2 is the first execution
Switch, the second one executing between switch, the maxima and minima of intrinsic feed motion time of mother execution switch take
Value；
Step 3, control unit judge whether the t4 that epicycle calculates is less than the first power input/second source input
The input voltage cycle, such as no, then the input voltage in the first power input/second source input turns after zero crossing again
To step 2, start a new round and calculate；In this way, then then judge whether described phase contrast ΔΦ is less than preset phase difference limen value, such as
It is less than, then go to step 4；Otherwise, convert failed in parallel；
Step 4, the control unit t4 moment after epicycle timing initial time sends conversion reclosing command in parallel, and in warp
Execution switch separating brake instruction, EOC in parallel is sent after crossing time t6；T6 obtains according to the following formula：
T6=t1+t2-t5,
Wherein, t1 is the default parallel connection persistent period, t5 for first execute switch, second execute switch, mother is held
A value between the maxima and minima of intrinsic separating brake movement time of row switch.
Following technical scheme also be can get according to identical invention thinking：
A kind of parallel connection power supply conversion equipment, including the first power input, second source input, the first outfan,
Two outfans, first execute switch, second execute switch, mother executes switch, control unit, the first execution switch is series at the
Between one power input and the first outfan, the second execution switch be series at second source input and the second outfan it
Between, mother execution switch be connected across between the first outfan and the second outfan, control unit can execute to first respectively switch,
Second executes switch, mother execution switch is controlled；Described control unit is included controller and is connected with controller respectively
Voltage detecting circuit, frequency detection circuit, switch condition detection circuit, execution switch conjunctions/sub-control circuit, phase-detection electric
Road, voltage detecting circuit, frequency detection circuit, phase detecting circuit are respectively used to defeated to the first power input and second source
Enter the input voltage at end, incoming frequency, input phase carry out real-time detection, switch condition detection circuit is used for the first execution is opened
Close, second execute switch, the on off state of mother execution switch carries out real-time detection, executing and switch conjunction/sub-control circuit and be used for
Execute to first switch, second execute switch, mother execution switch on off state be controlled；Described controller includes closing and divides
Lock command output module, in the conversion instruction in parallel being connected to outside and the first power input and second source input
In the case that input phase sequence, the difference of input voltage, the difference of incoming frequency are satisfied by default parallel connection switch condition, calculating can make simultaneously
The initial time of connection state is located at the first power input and is closed with the conversion in parallel at the input same phase of second source input
Lock instruction sends the moment, conversion separating brake instruction in parallel sends the moment, and respectively described conversion reclosing command in parallel send the moment,
Conversion separating brake instruction in parallel sends and constantly sends conversion reclosing command in parallel, conversion separating brake instruction in parallel.
Preferably, described on/off switch command output module is defeated with second source according to the first power input of real-time detection
The described conversion reclosing command in parallel of input phase difference calculating entering end sends the moment, conversion separating brake in parallel instructs and sends the moment.
Further, after the conversion instruction in parallel being connected to outside, described controller carries out in parallel turning in accordance with the following methods
Change control：
Step 1, judge whether following condition is met simultaneously：First power input is defeated with second source input
Enter that phase sequence is identical, the first power input is less than predeterminated voltage difference limen value with the difference of the input voltage of second source input, the
One power input is less than predeterminated frequency difference limen value with the difference of the incoming frequency of second source input；In this way, then 2 are gone to step,
As no, then convert failed in parallel；
Step 2, risen using the input voltage zero crossing of the first power input or second source input as epicycle timing
Begin the moment, and the input phase difference ΔΦ in this moment real-time detection first power input and second source input；Control
Unit calculates from epicycle timing initial time to the first power input according to following two formulas and second source input respectively
The input same phase moment between duration t3, and send conversion combined floodgate in parallel from epicycle timing initial time to controller and refer to
Make the duration t4 between the moment：
T4=t3-t2
Wherein, Δ f is that the first power input is poor with the incoming frequency of second source input, and t2 is that the first execution is opened
Close, second executes a value between switch, the maxima and minima of intrinsic feed motion time of mother execution switch；
Step 3, control unit judge whether the t4 that epicycle calculates is less than the first power input/second source input
The input voltage cycle, such as no, then the input voltage in the first power input/second source input turns after zero crossing again
To step 2, start a new round and calculate；In this way, then then judge whether described phase contrast ΔΦ is less than preset phase difference limen value, such as
It is less than, then go to step 4；Otherwise, convert failed in parallel；
Step 4, the control unit t4 moment after epicycle timing initial time sends conversion reclosing command in parallel, and in warp
Execution switch separating brake instruction, EOC in parallel is sent after crossing time t6；T6 obtains according to the following formula：
T6=t1+t2-t5,
Wherein, t1 is the default parallel connection persistent period, t5 for first execute switch, second execute switch, mother is held
A value between the maxima and minima of intrinsic separating brake movement time of row switch.
Technical scheme below can also be obtained according to identical invention thinking：
A kind of power-supply system, including the first power supply, second source and parallel connection power supply conversion equipment as described above, described simultaneously
First power input of connection power supply change-over device, second source input are connected with the first power supply, second source respectively.
Compared to existing technology, the invention has the advantages that：
The present invention, while the parallel connection power supply achieving not power-off is changed, effectively reduces the conjunction during power sources in parallel
Circular current, improves security of system, reliability；
The present invention is mainly realized by software, can achieve, cost of implementation is cheap by changing the program of existing equipment,
The scope of application is wider.
Brief description
Fig. 1 is the structured flowchart of power-supply system of the present invention；
Fig. 2 is the flow path switch schematic diagram in parallel of parallel connection power supply conversion equipment of the present invention；
Fig. 3 is the principle schematic of control method of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in detail：
The Alloy White Iron that the present invention is directed to existing for the existing automatic power converting system with translation function in parallel is larger
Deficiency, there is provided a kind of parallel connection switching control method, its thinking be be connected to parallel connection outside conversion instruction and determine two-way electricity
After the phase sequence in source, voltage difference, difference on the frequency meet default requirement, it is not immediately performed conversion in parallel, but according to two-way power supply
Phase contrast select switch period most preferably in parallel that Alloy White Iron can be made minimum, that is, ensure that the initial time of parallel connection is located at
At the input same phase of the first power input and second source input, carry out conversion in parallel in this period, thus effectively dropping
Alloy White Iron during low two-way power sources in parallel, improves security of system.The conversion in parallel of the present invention generally includes following several feelings
Condition：(1), when, the first power supply, second source are normal, now the first execution switch closes, the second execution switch closes, and mother executes switch
Point, when the first power supply abnormal, mother of closing first executes switch, then divides first to execute switch, realizes conversion in parallel；⑵
When first power supply, second source are normal, now the first execution switch closes, the second execution switch closes, and mother execution switch point, when the
When two power supplys abnormal, mother of closing first executes switch, then divides second to execute switch, realizes conversion in parallel；(3), the first electricity
Source is normal, when second source is abnormal, now the first execution switch conjunction, the second execution switch point, and mother execution switchs closes, when second
Power up is normal, closes second first and executes switch, then denominator connection executes switch, realizes conversion in parallel；(4), second source is being just
Often, during the first abnormity of power supply, now the first execution switch point, the second execution switch close, and mother execution switch closes, when the first power supply
Recover normal, close first first and execute switch, then denominator connection executes switch, realizes conversion in parallel；(5), the first power supply, the second electricity
When source is normal, now the first execution switch close, the second execution switch point, mother execution switch closes, when the first power supply occur abnormal
When, closing first second executes switch, then divides first to execute switch, realizes conversion in parallel；(6) the first power supply, second source are normal
When, now the first execution switch point, the second execution switch close, and mother execution switch closes, when second source abnormal, first
Close and first execute switch, then divide second to execute switch, realize conversion in parallel.
Fig. 1 shows the basic structure of power-supply system of the present invention.As shown in figure 1, the power-supply system of the present invention includes first
Power supply, second source and parallel connection power supply conversion equipment.Described parallel connection power supply conversion equipment includes：Connect the first power supply and respectively
First power input of two power supplys, second source input, respectively connect first load, second load the first outfan,
Second outfan, and first execute switch, second execute switch, mother executes switch, control unit, the first execution switch series
It is coupled between the first power input and the first outfan, the second execution switch is series at second source input and the second output
Between end, mother execution switch is connected across between the first outfan and the second outfan, and control unit can execute to first respectively
Switch, second execute switch, mother execute switch be controlled；It (is micro- in the present embodiment that described control unit includes controller
Processor) and be connected with controller respectively voltage detecting circuit, frequency detection circuit, switch condition detection circuit, execution
Switch conjunction/sub-control circuit, phase detecting circuit, voltage detecting circuit, frequency detection circuit, phase detecting circuit are respectively used to
Real-time detection is carried out to the input voltage of the first power input and second source input, incoming frequency, input phase, switch
State detection circuit be used for execute to first switch, second execute switch, mother executes the on off state switching and is examined in real time
Survey, execution switch conjunctions/sub-control circuit be used for execute to first switch, second execute switch, mother executes the switch shape switching
State is controlled；Described controller includes on/off switch command output module, in the conversion instruction in parallel being connected to outside and the
The input phase sequence of one power input and second source input, the difference of input voltage, the difference of incoming frequency are satisfied by presetting simultaneously
In the case of connection switch condition, it is defeated with second source that calculating can make the initial time of parallel connection be located at the first power input
The conversion reclosing command in parallel inputting at same phase entering end sends the moment, conversion separating brake in parallel instructs and sends the moment, the first electricity
The input voltage cycle of source input/second source input, and respectively described conversion reclosing command in parallel send the moment and
Connection conversion separating brake instruction sends and constantly sends conversion reclosing command in parallel, conversion separating brake instruction in parallel.In addition, this device is also
Including the power circuit powered for each part of control unit, the power circuit in the present embodiment is from the first power supply and/or second
Power supply obtains electric energy, and is converted into suitable voltage for control unit use.
Voltage detecting circuit in said apparatus, frequency detection circuit, switch condition detection circuit, execution switch close/point
Control circuit, phase detecting circuit are this area mature technology, and those skilled in the art can be according to practical situation from concrete
Circuit structure.Frequency detection circuit in the present embodiment is that the first power supply and second source voltage signal are converted to zero passage arteries and veins
Rush signal and transmit to microprocessor, by microprocessor according to obtaining the first power supply and second source according to zero-crossing pulse signal
Frequency.
Fig. 2 shows that parallel connection power supply conversion equipment of the present invention carries out basic procedure during conversion in parallel.In the present embodiment with
The interruption entrance that the voltage zero-cross moment of second source B phase judges, calculates as conversion in parallel.As shown in Fig. 2 work as receiving outside
Conversion instruction in parallel after, controller first determines whether whether the phase sequence of two-way power supply identical, if it is different, then convert failed in parallel,
If identical, enter as a next step it is determined that whether the voltage difference of two-way power supply is less than the voltage difference threshold value setting, if voltage difference is more than
Given threshold then convert failed in parallel, if voltage difference is less than given threshold, enters as a next step it is determined that the difference on the frequency of two-way power supply
Whether less than the difference on the frequency threshold value setting, if difference on the frequency is more than given threshold, convert failed in parallel, if difference on the frequency is less than set
Threshold value, then enter next step, the phase contrast of controller real-time detection two-way power supply, and calculates in real time from the voltage zero-cross moment to two
The duration of the switch instant most preferably in parallel of road power supply, then judge whether this duration is less than the input voltage cycle of second source, if
It is whether the real-time phase difference then judging two-way power supply is less than the phase difference threshold setting, if phase contrast is more than given threshold, simultaneously
Connection convert failed, if phase contrast is less than given threshold, execution conversion in parallel.
When determining that the phase sequence of two-way power supply, voltage difference, difference on the frequency are satisfied by preset requirement, the present invention is not to hold immediately
Row conversion in parallel, but first the minimum conversion most preferably in parallel of Alloy White Iron is made according to the real-time phase difference calculating of two-way power supply
Period, and carry out conversion in parallel in this period.Specifically, controller be connected to outside conversion instruction in parallel after, described control
Device carries out conversion and control in parallel in accordance with the following methods：
Step 1, judge whether following condition is met simultaneously：First power input is defeated with second source input
Enter that phase sequence is identical, the first power input is less than predeterminated voltage difference limen value with the difference of the input voltage of second source input, the
One power input is less than predeterminated frequency difference limen value with the difference of the incoming frequency of second source input；In this way, then 2 are gone to step,
As no, then convert failed in parallel；
Step 2, risen using the input voltage zero crossing of the first power input or second source input as epicycle timing
Begin the moment, and the input phase difference ΔΦ in this moment real-time detection first power input and second source input；Control
Unit calculates from epicycle timing initial time to the first power input according to following two formulas and second source input respectively
The input same phase moment between duration t3, and send conversion combined floodgate in parallel from epicycle timing initial time to controller and refer to
Make the duration t4 between the moment：
T4=t3-t2
Wherein, Δ f is that the first power input is poor with the incoming frequency of second source input, and t2 is that the first execution is opened
Close, second executes a value between switch, the maxima and minima of intrinsic feed motion time of mother execution switch；
Step 3, control unit judge whether the t4 that epicycle calculates is less than the first power input/second source input
The input voltage cycle, such as no, then the input voltage in the first power input/second source input turns after zero crossing again
To step 2, start a new round and calculate；In this way, then then judge whether described phase contrast ΔΦ is less than preset phase difference limen value, such as
It is less than, then go to step 4；Otherwise, convert failed in parallel；
Step 4, the control unit t4 moment after epicycle timing initial time sends conversion reclosing command in parallel, and in warp
Execution switch separating brake instruction, EOC in parallel is sent after crossing time t6；T6 obtains according to the following formula：
T6=t1+t2-t5,
Wherein, t1 is the default parallel connection persistent period, t5 for first execute switch, second execute switch, mother is held
A value between the maxima and minima of intrinsic separating brake movement time of row switch.
In the present embodiment, it to be first to execute switch, second execute switch, the intrinsic conjunction of mother execution switch that the value of t2 is excellent
The average of lock movement time, it to be first to execute switch, second execute switch, the intrinsic separating brake of mother execution switch that the value of t5 is excellent
The average of movement time.
So that each execution switch is all using frame circuit breaker as a example, described first executes switch, second executes switch, mother
The intrinsic feed motion time of execution switch refers to that the closing coil of frame circuit breaker is energized to the time of main contact closure；First
Execute switch, second execute switch, the intrinsic separating brake of mother execution switch refers to the switching winding of frame circuit breaker movement time
It is energized to the time of main contact disconnection.
The fluctuation of the two-way power input frequency of occurrences can be prevented thus leading to most preferably simultaneously using above-mentioned parallel connection conversion and control flow process
The connection period calculates inaccurate situation.
More fully understand for ease of the public, below the ultimate principle of the present invention is further elaborated.This enforcement
Using the second source voltage positive going zeror crossing moment as the phase contrast interrupting entrance real-time detection first power supply and second source in example.
As shown in figure 3, when the phase contrast that controller real-time detection arrives is ΔΦ0, this moment to the first power supply and second electricity
Source same phase elapsed time is t3,(Δf>0, that is, the frequency of the first power supply is more than the frequency of second source
Rate.)；(Δf<0, that is, the frequency of the first power supply is less than the frequency of second source.), Δ f：First power supply and second
The difference on the frequency of power supply；ΔΦ0：The first power supply that controller real-time detection arrives and the phase contrast of second source.Controller is examined in real time
Survey the frequency of the first power supply and the frequency of second source, thus obtaining the frequency difference Δ f of the first power supply and second source, according to Δ
F and ΔΦ0Value obtain t3 value from t3 formula.Time t2, time t5 and time t1 in parallel can be preset by controller,
Thus controller can start timing from the second source zero crossing moment (i.e. A moment Fig. 3), when timing time reaches t3-
During t2 (the B moment in Fig. 3), controller sends close a floodgate order, after elapsed time t2, automatic electric in parallel to mother execution switch
The source converting system C moment in figure 3 realizes parallel connection, and the B same phase of the first power supply and second source during this moment, in D
During quarter, parallel connection terminates.In parallel process, the order of disjunction execution switch is using the B moment as time zero, through t6 (t6=t1
+ t2-t5) send after the time.From figure 3, it can be seen that phase contrast when connecting in parallel is 0 degree it is ensured that in parallel when closing a floodgate
Alloy White Iron is 0, and phase contrast experienced a process from small to large, so that the Alloy White Iron in whole parallel process is
Occur in greatly the D moment, in order to reduce Alloy White Iron value further, can be realized by reducing time t1 in parallel, time t1 in parallel
Less, the first power supply is less with the maximum phase difference of second source, and Alloy White Iron value is less.
The present invention passes through to select the switch period most preferably in parallel making Alloy White Iron minimum to carry out conversion in parallel, optimizes existing
There is the switching control method in parallel of conversion two inlet wire one mother automatic power converting system in parallel, ensureing uninterrupted power supply conversion
While, effectively reduce Alloy White Iron, improve security of system, reliability.Technical scheme only needs to existing
Two inlet wire one mother automatic power converting system carries out simple program setting and can achieve, before therefore having a wide range of applications
Scape.
Claims (6)
1. a kind of control method of parallel connection power supply conversion equipment, described parallel connection power supply conversion equipment include the first power input,
Second source input, the first outfan, the second outfan, first execute switch, second execute switch, mother executes switch,
Control unit, the first execution switch is series between the first power input and the first outfan, and the second execution switch is series at
Between second source input and the second outfan, mother execution switch is connected across between the first outfan and the second outfan,
Control unit be used for respectively execute to first switch, second execute switch, mother execute switch be controlled；It is characterized in that,
Described control unit, after the conversion instruction in parallel being connected to outside, carries out conversion and control in parallel in accordance with the following methods：In the first electricity
The input phase sequence of source input and second source input, the difference of input voltage, the difference of incoming frequency are satisfied by default in parallel turn
In the case of changing condition, control unit calculates so that parallel connection initial time is located at the first power input and second source
Conversion reclosing command in parallel at the input same phase of input sends the moment, conversion separating brake instruction in parallel sends the moment, and point
Not do not send the moment in described conversion reclosing command in parallel, conversion separating brake instruction in parallel sends and constantly sends conversion combined floodgate in parallel and refer to
Make, conversion separating brake in parallel instructs；Control unit is defeated according to the first power input of real-time detection and second source input
The described conversion reclosing command in parallel of applying aspect difference calculating sends the moment, conversion separating brake in parallel instructs and sends the moment；Described in parallel turn
The idiographic flow changing control is as follows：
Step 1, judge whether following condition is met simultaneously：The input phase of the first power input and second source input
Sequence is identical, and the first power input is less than predeterminated voltage difference limen value, the first electricity with the difference of the input voltage of second source input
Source input is less than predeterminated frequency difference limen value with the difference of the incoming frequency of second source input；In this way, then 2 are gone to step, such as no,
Then convert failed in parallel；
Step 2, using the input voltage zero crossing of the first power input or second source input as epicycle timing initiate when
Carve, and the input phase difference ΔΦ in this moment real-time detection first power input and second source input；Control unit
Calculate defeated with second source input from epicycle timing initial time to the first power input respectively according to following two formulas
Enter the duration t3 between the same phase moment, and from epicycle timing initial time to controller send conversion reclosing command in parallel when
Duration t4 between quarter：
T4=t3-t2
Wherein, to be the first power input poor with the incoming frequency of second source input for Δ f, t2 for first execute switch, the
Two execute a value between switch, the maxima and minima of intrinsic feed motion time of mother execution switch；
Step 3, control unit judge whether the t4 that epicycle calculates is defeated less than the first power input/second source input
Enter voltage cycle, such as no, then the input voltage in the first power input/second source input goes to step after zero crossing again
Rapid 2, start a new round and calculate；In this way, then then judge whether described phase contrast ΔΦ is less than preset phase difference limen value, such as little
In then going to step 4；Otherwise, convert failed in parallel；
Step 4, the control unit t4 moment after epicycle timing initial time sends conversion reclosing command in parallel, and through out-of-date
Between send execution switch separating brake instruction, EOC in parallel after t6；T6 obtains according to the following formula：
T6=t1+t2-t5,
Wherein, t1 be the default parallel connection persistent period, t5 be first execute switch, second execute switch, mother execute open
A value between the maxima and minima of the intrinsic separating brake movement time closed.
2. control method as claimed in claim 1 it is characterised in that t2 value for first execute switch, second execute switch,
The average of the intrinsic feed motion time of mother execution switch, the value of t5 executes switch, second executes switch, mother for first
The average of intrinsic separating brake movement time of execution switch.
3. a kind of parallel connection power supply conversion equipment, including the first power input, second source input, the first outfan, second
Outfan, first execute switch, second execute switch, mother executes switch, control unit, the first execution switch is series at first
Between power input and the first outfan, the second execution switch is series between second source input and the second outfan,
Mother execution switch be connected across between the first outfan and the second outfan, control unit be used for respectively execute to first switch,
Second executes switch, mother execution switch is controlled；It is characterized in that, described control unit include controller and respectively with
Controller connect voltage detecting circuit, frequency detection circuit, switch condition detection circuit, execution switch conjunction/sub-control circuit,
Phase detecting circuit, voltage detecting circuit, frequency detection circuit, phase detecting circuit be respectively used to the first power input and
The input voltage of second source input, incoming frequency, input phase carry out real-time detection, and it is right that switch condition detection circuit is used for
First execute switch, second execute switch, the on off state of mother execution switch carries out real-time detection, execution switch conjunction/sub-control
Circuit processed be used for execute to first switch, second execute switch, mother executes the on off state switching and is controlled；Described control
Device includes on/off switch command output module, in the conversion instruction in parallel being connected to outside and the first power input and second electric
In the case that the input phase sequence of source input, the difference of input voltage, the difference of incoming frequency are satisfied by default parallel connection switch condition, meter
Calculate and the initial time of parallel connection is located at the first power input and the input same phase of second source input
Conversion reclosing command in parallel sends the moment, conversion separating brake instruction in parallel sends the moment, and refers in described conversion combined floodgate in parallel respectively
Order sends the moment, conversion separating brake instruction in parallel sends and constantly sends conversion reclosing command in parallel, conversion separating brake instruction in parallel；Described
On/off switch command output module is counted with the input phase difference of second source input according to the first power input of real-time detection
The described conversion reclosing command in parallel of calculation sends the moment, conversion separating brake in parallel instructs and sends the moment；It is being connected to the conversion in parallel of outside
After instruction, described controller carries out conversion and control in parallel in accordance with the following methods：
Step 1, judge whether following condition is met simultaneously：The input phase of the first power input and second source input
Sequence is identical, and the first power input is less than predeterminated voltage difference limen value, the first electricity with the difference of the input voltage of second source input
Source input is less than predeterminated frequency difference limen value with the difference of the incoming frequency of second source input；In this way, then 2 are gone to step, such as no,
Then convert failed in parallel；
Step 2, using the input voltage zero crossing of the first power input or second source input as epicycle timing initiate when
Carve, and the input phase difference ΔΦ in this moment real-time detection first power input and second source input；Control unit
Calculate defeated with second source input from epicycle timing initial time to the first power input respectively according to following two formulas
Enter the duration t3 between the same phase moment, and from epicycle timing initial time to controller send conversion reclosing command in parallel when
Duration t4 between quarter：
T4=t3-t2
Wherein, to be the first power input poor with the incoming frequency of second source input for Δ f, t2 for first execute switch, the
Two execute a value between switch, the maxima and minima of intrinsic feed motion time of mother execution switch；
Step 3, control unit judge whether the t4 that epicycle calculates is defeated less than the first power input/second source input
Enter voltage cycle, such as no, then the input voltage in the first power input/second source input goes to step after zero crossing again
Rapid 2, start a new round and calculate；In this way, then then judge whether described phase contrast ΔΦ is less than preset phase difference limen value, such as little
In then going to step 4；Otherwise, convert failed in parallel；
Step 4, the control unit t4 moment after epicycle timing initial time sends conversion reclosing command in parallel, and through out-of-date
Between send execution switch separating brake instruction, EOC in parallel after t6；T6 obtains according to the following formula：
T6=t1+t2-t5,
Wherein, t1 be the default parallel connection persistent period, t5 be first execute switch, second execute switch, mother execute open
A value between the maxima and minima of the intrinsic separating brake movement time closed.
4. parallel connection power supply conversion equipment as claimed in claim 3 it is characterised in that t2 value for first execute switch, second
Execute switch, the average of the intrinsic feed motion time of mother execution switch, the value of t5 executes switch, the second execution for first
Switch, the average of intrinsic separating brake movement time of mother execution switch.
5. as described in claim 3 or 4 parallel connection power supply conversion equipment it is characterised in that described control unit also include for for
The power circuit that each part of control unit is powered, the input of described power circuit and the first power input and/or the second electricity
Source input connects.
6. a kind of power-supply system, including the first power supply, second source and parallel connection power supply as described in any one of claim 3～5
Conversion equipment, the first power input of described parallel connection power supply conversion equipment, second source input respectively with the first power supply,
Two power supplys connect.
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