CN110401223A - Control method and control device of photovoltaic system and photovoltaic system - Google Patents
Control method and control device of photovoltaic system and photovoltaic system Download PDFInfo
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- CN110401223A CN110401223A CN201910698976.3A CN201910698976A CN110401223A CN 110401223 A CN110401223 A CN 110401223A CN 201910698976 A CN201910698976 A CN 201910698976A CN 110401223 A CN110401223 A CN 110401223A
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- 238000004590 computer program Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 15
- 230000005611 electricity Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The disclosure provides a control method and a control device of a photovoltaic system and the photovoltaic system, and relates to the technical field of photovoltaic. The control method of the photovoltaic system comprises the following steps: acquiring a voltage value and frequency of an alternating current power grid; under the condition that the photovoltaic system is in a feed network operation state and a load in the operation state exists: and if the average value of the voltage values is not within the first preset voltage range and the frequency is not within the preset frequency range, switching the photovoltaic system into a non-grid feeding state. By the method, the photovoltaic system can be switched to the non-grid-feeding state according to the state of the alternating current power grid, so that the situation that the grid is fed to deteriorate the stability of the power grid under the condition that the power grid is unstable is avoided, and the stability of the power grid is improved.
Description
Technical field
This disclosure relates to photovoltaic technology field, especially a kind of control method of photovoltaic system, control device and photovoltaic system
System.
Background technique
Load-carrying photovoltaic system, such as PV air-conditioner system, power supply using photovoltaic cell as air-conditioning is not only saved
The energy has been saved, while also having protected environment, therefore there is good development prospect.But with solar panel generating capacity
It is constantly promoted, in addition to supply air-conditioning system is also possible to that extra energy can be generated other than, this part energy can pass through setting
Power generation is carried out to feed back to power grid；Photovoltaic generation power can also be limited by setting, the energy for generating photovoltaic is just full
Excess energy feedback net situation is not had needed for sufficient air-conditioning.
Summary of the invention
Inventors have found that since the setting of feedback net and non-feedback net is default conditions or is filled by external key, dial-up etc.
It sets and is manually set, sometimes and network electric energy quality can be poor, adversely affects to the stability of power grid.
One purpose of the disclosure is to improve the stability of power grid.
According to one aspect of the disclosure, a kind of control method of photovoltaic system is proposed, comprising: obtain the electricity of AC network
Pressure value and frequency；Feedback Running State is in photovoltaic system and there are in the case where the load of operating status: if voltage value
Average value is not located in the first predetermined voltage range, and frequency is not located in scheduled frequency range, then is switched to photovoltaic system
Non- feedback net state.
In some embodiments, the control method of photovoltaic system further include: it is in non-feedback Running State in photovoltaic system,
And there are in the case where the load of operating status: if the average value of voltage value be not located in the second predetermined voltage range or frequency not
In scheduled frequency range, then keeping photovoltaic system is non-feedback net state.
In some embodiments, the control method of photovoltaic system further include: if the average bits of voltage value are predetermined in first
In voltage range or frequency is located in scheduled frequency range, then keeps photovoltaic system for feedback Running State.
In some embodiments, the control method of photovoltaic system further include: it is in non-feedback Running State in photovoltaic system,
And there are in the case where the load of operating status: if frequency is located in scheduled frequency range, and the average bits of voltage value are in
In two predetermined voltage ranges, then photovoltaic system is switched to feedback Running State.
In some embodiments, the control method of photovoltaic system further include: be not located at third predetermined voltage model in voltage value
In the case where in enclosing, photovoltaic system is switched to guard mode.
In some embodiments, the control method of photovoltaic system meets at least one of following: the first predetermined voltage range and
Third predetermined voltage range is centered on voltage rating；Third predetermined voltage range is greater than the first predetermined voltage range；First is pre-
Constant voltage range is more than or equal to second voltage range；Or, scheduled frequency range is centered on power grid standard frequency.
In some embodiments, the control method of photovoltaic system meets at least one of following: the second predetermined voltage range with
Centered on voltage rating；Third predetermined voltage range is greater than the second predetermined voltage range, wherein it is pre- not to be located at third in voltage value
In the case where within the scope of constant voltage, photovoltaic system is switched to guard mode；Or, the first predetermined voltage range is more than or equal to second
Voltage range.
In some embodiments, the control method of photovoltaic system meets at least one of following: the first predetermined voltage range is
[0.88 times of voltage rating, 1.1 times of voltage rating]；Third predetermined voltage range is [0.8 times of voltage rating, specified electricity
1.15 times of pressure]；Or scheduled frequency range is [power grid standard frequency -0.5Hz, power grid standard frequency+0.5Hz].
In some embodiments, the control method of photovoltaic system meets at least one of following: the first predetermined voltage range is
[0.88 times of voltage rating, 1.1 times of voltage rating]；Second predetermined voltage range is [0.9 times of voltage rating, specified electricity
1.08 times of pressure]；Third predetermined voltage range is [0.8 times of voltage rating, 1.15 times of voltage rating]；Or preset frequency model
It encloses for [power grid standard frequency -0.5Hz, power grid standard frequency+0.5Hz].
In some embodiments, the control method of photovoltaic system further include: there is no operating statuses in photovoltaic system
In the case where load, feedback Running State is kept.
In some embodiments, photovoltaic system is PV air-conditioner system.
By such method, photovoltaic system can be switched to non-feedback net state according to the state of AC network, thus
Feedback net deteriorates the stable case of power grid in the case where avoiding power grid unstable, improves the stability of power grid.
According to the one aspect of some embodiments of the present disclosure, a kind of control device of photovoltaic system is proposed, comprising: voltage
Acquisition unit is configured as obtaining the voltage value of AC network；Frequency collection unit is configured as obtaining the frequency of AC network
Rate；The case where switch unit is configured as in the case where photovoltaic system is in feedback Running State, and there are the loads of operating status
Under: if the average value of voltage value is not located in the first predetermined voltage range, and frequency is not located in scheduled frequency range, then by light
Volt system is switched to non-feedback net state.
In some embodiments, switch unit is additionally configured to be in non-feedback Running State in photovoltaic system, and exists
In the case where the load of operating status, if the average value of voltage value be not located in the second predetermined voltage range or frequency be not located at it is pre-
Determine in frequency range, then keeping photovoltaic system is non-feedback net state.
In some embodiments, switch unit is additionally configured to the average bits in voltage value in the first predetermined voltage range
In the case that interior or frequency is located in scheduled frequency range, keeping photovoltaic system is feedback Running State.
In some embodiments, switch unit is additionally configured to be in non-feedback Running State in photovoltaic system, and exists
In the case where the load of operating status: if frequency is located in scheduled frequency range, and the average bits of voltage value are predetermined in second
In voltage range, then photovoltaic system is switched to feedback Running State.
According to the one aspect of some embodiments of the present disclosure, a kind of control device of photovoltaic system is proposed, comprising: storage
Device；And it is coupled to the processor of memory, processor is configured as above appointing based on the instruction execution for being stored in memory
It anticipates the control method of photovoltaic system a kind of.
Photovoltaic system can be switched to non-feedback net state according to the state of AC network by such control device, to keep away
Exempt to present the stable case that net deteriorates power grid in the case that power grid is unstable, improves the stability of power grid.
According to the one aspect of some embodiments of the present disclosure, proposes a kind of computer readable storage medium, store thereon
There are computer program instructions, the controlling party for any one photovoltaic system being mentioned above is realized when which is executed by processor
The step of method.
It, can be according to the state of AC network by photovoltaic by executing the instruction on such computer readable storage medium
System is switched to non-feedback net state, so that feedback net deteriorates the stable case of power grid in the case where avoiding power grid unstable, improves
The stability of power grid.
According to the one aspect of some embodiments of the present disclosure, a kind of photovoltaic system is proposed, comprising: photovoltaic device is matched
It is set to and produces electricl energy；Load is configured as the electric energy that consumption photovoltaic device generates or the electric energy work from AC network；With,
The control device for any one photovoltaic system being mentioned above.
In such photovoltaic system, the control device of photovoltaic system can be cut photovoltaic system according to the state of AC network
It is changed to non-feedback net state, so that feedback net deteriorates the stable case of power grid in the case where avoiding power grid unstable, improves power grid
Stability.
Detailed description of the invention
Attached drawing described herein is used to provide further understanding of the disclosure, constitutes a part of this disclosure, this public affairs
The illustrative embodiments and their description opened do not constitute the improper restriction to the disclosure for explaining the disclosure.In the accompanying drawings:
Fig. 1 is the flow chart of some embodiments of the control method of the photovoltaic system of the disclosure.
Fig. 2 is the flow chart of other embodiments of the control method of the photovoltaic system of the disclosure.
Fig. 3 is the flow chart of the other embodiment of the control method of the photovoltaic system of the disclosure.
Fig. 4 is the flow chart of the still other embodiments of the control method of the photovoltaic system of the disclosure.
Fig. 5 is the schematic diagram of some embodiments of the control device of the photovoltaic system of the disclosure.
Fig. 6 is the schematic diagram of other embodiments of the control device of the photovoltaic system of the disclosure.
Fig. 7 is the schematic diagram of the other embodiment of the control device of the photovoltaic system of the disclosure.
Fig. 8 is the schematic diagram of some embodiments of the photovoltaic system of the disclosure.
Fig. 9 is the schematic diagram of other embodiments of the photovoltaic system of the disclosure.
Specific embodiment
Below by drawings and examples, the technical solution of the disclosure is described in further detail.
The flow chart of some embodiments of the control method of the photovoltaic system of the disclosure is as shown in Figure 1.
In a step 101, the voltage value and frequency of AC network are obtained.It in some embodiments, can be in AC network
Close to the voltage value and frequency situation of any position of photovoltaic system acquisition AC network.It in some embodiments, can be multiple
Measurement voltage value is simultaneously averaged, and such as takes the average value of 10 voltage values.In some embodiments, it can be carried out with the frequency of 8KHz
Voltage measurement.
In a step 102, judge whether photovoltaic system is in feedback Running State, and there are the loads of operating status.If
The load of operating status is not present in photovoltaic system, then photovoltaic system operates under pure photovoltaic mode, keeps current feedback netted
State.If photovoltaic system operates under non-pure photovoltaic mode, and then if it is determined that light there are the load of operating status in photovoltaic system
Volt system is in feedback Running State, thens follow the steps 103.
In step 103, judge whether that the average value of voltage value is not located in the first predetermined voltage range, and frequency not position
In in scheduled frequency range.If it is determined that the average value of voltage value is not located in the first predetermined voltage range, and frequency be not located at it is pre-
Determine in frequency range, then follow the steps 104, otherwise, keeps current feedback net state.
In some embodiments, the first predetermined voltage range be centered on voltage rating, section be [first make a reservation for it is under-voltage
Value, the first predetermined excess pressure value].In some embodiments, the first predetermined voltage range can be [0.88 times of voltage rating, volume
1.1 times of constant voltage].
In some embodiments, scheduled frequency range is certain frequency centered on power grid standard frequency (such as 50Hz)
Range, if scheduled frequency range can be [power grid standard frequency -0.5Hz, power grid standard frequency+0.5Hz].
At step 104, photovoltaic system is switched to non-feedback net state.
By such method, photovoltaic system can be switched to non-feedback net state according to the state of AC network, thus
Feedback net deteriorates the stable case of power grid in the case where avoiding power grid unstable, improves the stability of power grid.
The flow chart of other embodiments of the control method of the photovoltaic system of the disclosure is as shown in Figure 2.
In step 201, the voltage value and frequency of AC network are obtained.
In step 202, judge that photovoltaic system is in non-feedback Running State, and there are the loads of operating status.If light
The load of operating status is not present in volt system, then photovoltaic system operates under pure photovoltaic mode, then is switched to feedback net state.If
There are the loads of operating status in photovoltaic system, then photovoltaic system operates under non-pure photovoltaic mode, and then if it is determined that photovoltaic system
System is in non-feedback Running State, thens follow the steps 203.
In step 203, judge whether that the average value of voltage value is not located in the second predetermined voltage range or frequency not position
In in scheduled frequency range.If it is determined that the average value of voltage value be not located in the second predetermined voltage range or frequency be not located at it is pre-
Determine in frequency range, thens follow the steps 204；Otherwise, it is switched to feedback Running State.
In some embodiments, the second predetermined voltage range be centered on voltage rating, section be [second make a reservation for it is under-voltage
Value, the second predetermined excess pressure value].In some embodiments, the interval width of the second predetermined voltage range is no more than the first predetermined electricity
Press range.
In some embodiments, the second predetermined voltage range can be identical as the first predetermined voltage range, to reduce light
The judgement parameter of volt system reduces operation difficulty；In further embodiments, the interval width of the second predetermined voltage range is less than
First predetermined voltage range, such as the second predetermined voltage range can be [0.9 times of voltage rating, 1.08 times of voltage rating],
To improve from non-feedback Running State and be switched to feedback net fortune compared with being switched to non-feedback Running State from feedback Running State
The difficulty of row state reduces the difficulty for being switched to non-feedback Running State from feedback Running State, further ensures the steady of power grid
It is qualitative.
In step 204, photovoltaic system is switched to non-feedback net state.
It by such method, can be according to voltage, the state of frequency in the case where photovoltaic system is in non-feedback Running State
Determine whether to be switched to the operation of feedback net or keep non-feedback net state, on the one hand can continue to the stability of maintenance power grid, separately
On the one hand it can also promote photovoltaic system to be switched to feedback net state in a suitable case, improve utilization rate of electrical.
The flow chart of the other embodiment of the control method of the photovoltaic system of the disclosure is as shown in Figure 3.
In step 301, the voltage of AC network is obtained.
In step 302, judge that photovoltaic system whether there is the load of operating status.If it is determined that there are the negative of operating status
It carries, i.e., photovoltaic system is in non-pure photovoltaic state, thens follow the steps 303；It is no to then follow the steps 305.
In step 303, judge whether voltage is located in third predetermined voltage range.If it is determined that not to be located at third pre- for voltage
Within the scope of constant voltage, 304 are thened follow the steps.In some embodiments, however, it is determined that voltage is located in third predetermined voltage range, then
The operation in embodiment as shown in Figure 1 and Figure 2 above can be executed.
In some embodiments, third predetermined voltage range is centered on voltage rating, and section is that [third makes a reservation for under-voltage
Value, third predetermined excess pressure value].In some embodiments, the interval width of third predetermined voltage range is greater than the first predetermined voltage
Range, if third predetermined voltage range can be [0.8 times of voltage rating, 1.15 times of voltage rating].
In step 304, overvoltage/undervoltage protection is executed, photovoltaic system is switched to guard mode.
In step 305, control photovoltaic system is in feedback net state.
By such method, can find in time over-voltage, under-voltage degree beyond safe tolerance range, and then in time into
Enter guard mode and out of service, protection photovoltaic system, the service life of raising safety and equipment.
In some embodiments, the voltage being compared with third predetermined voltage range can with it is above predetermined with first
The voltage that voltage range or the second predetermined voltage range compare is identical, is average voltage；In further embodiments, with third
The voltage that predetermined voltage range is compared can be real-time voltage, to hold if discovery is more than third predetermined voltage range
Row protection operation, improves the degree of protection to photovoltaic system.
The flow chart of the still other embodiments of the control method of the photovoltaic system of the disclosure is as shown in Figure 4, wherein in bracket
Data be by taking AC230V, 50Hz as an example, be only used as example, do not constitute the improper restriction to the disclosure.
In step 401, system executes step 402 first by AC network for electrically activating.
In step 402, it powers on and is defaulted as feedback Running State.
In step 403, the voltage value of AC network is obtained.In some embodiments, exchange can be counted for continuous ten times
The numerical value of voltage is simultaneously averaged.
In step 404, judge that photovoltaic system whether there is the load of operating status.In some embodiments, Ke Yigen
Working condition according to photovoltaic module and DC-DC circuit, grid-connected module and DC-AC circuit, outdoor machine of air-conditioner or other loads judges light
Whether volt system works in pure photovoltaic mode.If photovoltaic system runs on pure photovoltaic mode, 402 are thened follow the steps, keeps feedback net
Operating status；If photovoltaic system runs on non-pure photovoltaic mode, 405 are thened follow the steps.
In step 405, judge whether the voltage value of real-time monitoring is located in third predetermined voltage range.If being located at third
In predetermined voltage range, 407 are thened follow the steps；If exceeding third predetermined voltage range, including it is lower than the predetermined under-voltage value of third
(AC230V × 0.8=AC184V) or it is higher than third predetermined excess pressure value (AC230V × 1.15=AC264.5V), thens follow the steps
406。
In a step 406, overvoltage/undervoltage guard mode is switched to.
In step 407, judge whether the average value of voltage value is located in the first predetermined voltage range.If it is pre- to be located at first
Within the scope of constant voltage, 402 are thened follow the steps；If exceeding the first predetermined voltage range, including it is lower than the first predetermined under-voltage value
(AC230V × 0.88=AC202.4V) or it is higher than the first predetermined excess pressure value (AC230V × 1.1=AC253V), thens follow the steps
408。
In a step 408, the frequency of AC network is detected, and whether determination frequency is located in scheduled frequency range.If position
In in scheduled frequency range, 402 are thened follow the steps；If exceeding scheduled frequency range, 409 are thened follow the steps.
In step 409, control photovoltaic system is in non-feedback Running State, and then executes step 410.
In step 410, the voltage value of AC network is obtained, in some embodiments, exchange can be counted for continuous ten times
The numerical value of voltage is simultaneously averaged.
In step 411, there are the loads of operating status for photovoltaic system.It in some embodiments, can be according to photovoltaic mould
Block and DC (Direct Current, direct current)-DC circuit, grid-connected module and DC-AC (Alternating Current, exchange
Electricity) circuit, outdoor machine of air-conditioner or other load working conditions judge whether photovoltaic system works in pure photovoltaic mode.If photovoltaic system
System runs on pure photovoltaic mode, thens follow the steps 402, is switched to feedback Running State；If photovoltaic system runs on non-pure photovoltaic
Mode thens follow the steps 412.
In step 412, judge whether the voltage value of real-time monitoring is located in third predetermined voltage range.If being located at third
In predetermined voltage range, 413 are thened follow the steps；If exceeding third predetermined voltage range, including it is lower than the predetermined under-voltage value of third
(AC230V × 0.9=AC207V) or it is higher than third predetermined excess pressure value (AC230V × 1.08=AC248.4V), thens follow the steps
406。
In step 413, judge whether the average value of voltage value is located in the second predetermined voltage range.If it is pre- to be located at second
Within the scope of constant voltage, 414 are thened follow the steps；If exceeding the second predetermined voltage range, including it is lower than the second predetermined under-voltage value or height
In the second predetermined excess pressure value, 409 are thened follow the steps.
In step 414, the frequency of AC network is detected, and whether determination frequency is located in scheduled frequency range.If position
In in scheduled frequency range, 402 are thened follow the steps, switches to feedback net state operation；If exceeding scheduled frequency range, step is executed
Rapid 409.
By such method, it is capable of forming cyclic switching process, realizes the automatic switchover of feedback net, non-feedback net state, from
And the power quality of feedback net power generation can be optimized, mitigate network load, user does not need manual operation setting yet, enhances system
Whole self-regulation ability.
The schematic diagram of some embodiments of the control device of the photovoltaic system of the disclosure is as shown in Figure 5.
Voltage acquisition unit 501 can obtain the voltage value of AC network.It in some embodiments, can be in AC network
Close to the voltage value of any position of photovoltaic system acquisition AC network.In some embodiments, voltage value can repeatedly be measured
And be averaged, such as take the average value of 10 voltage values.In some embodiments, voltage measurement can be carried out with the frequency of 8KHz.
Frequency collection unit 503 can obtain the frequency of AC network.In some embodiments, it can be leaned in AC network
The frequency situation of any position acquisition AC network of nearly photovoltaic system.
Switch unit 502 can be in the case where photovoltaic system be in feedback Running State, and there are the feelings of the load of operating status
Under condition, however, it is determined that the average value of voltage value is not located in the first predetermined voltage range, and frequency is not located in scheduled frequency range,
Photovoltaic system is then switched to non-feedback net state.In some embodiments, switch unit 502 can also be in the average value of voltage value
In the first predetermined voltage range or in the case that frequency is located in scheduled frequency range, keeping photovoltaic system is feedback net fortune
Row state.
Photovoltaic system can be switched to non-feedback net state according to the state of AC network by such control device, to keep away
Exempt to present the stable case that net deteriorates power grid in the case that power grid is unstable, improves the stability of power grid.
In some embodiments, switch unit can also be in non-feedback Running State in photovoltaic system, and there is operation
In the case where the load of state, if the average value of voltage value is not located in the second predetermined voltage range or frequency is not located at predetermined frequency
Within the scope of rate, control photovoltaic system keeps non-feedback net state；In some embodiments, if frequency is located in scheduled frequency range,
And photovoltaic system is then switched to feedback Running State in the second predetermined voltage range by the average bits of voltage value.
Such control device, can be according to voltage, the state of frequency in the case where photovoltaic system is in non-feedback Running State
Determine whether to be switched to the operation of feedback net or keep non-feedback net state, on the one hand can continue to the stability of maintenance power grid, separately
On the one hand it can also promote photovoltaic system to be switched to feedback net state in a suitable case, improve utilization rate of electrical.
The structural schematic diagram of one embodiment of the control device of disclosure photovoltaic system is as shown in Figure 6.Photovoltaic system
Control device includes memory 601 and processor 602.Wherein: memory 601 can be disk, flash memory or other any non-easy
The property lost storage medium.Memory is used to store the instruction in the above corresponding embodiment of the control method of photovoltaic system.Processing
Device 602 is coupled to memory 601, can be used as one or more integrated circuits to implement, such as microprocessor or microcontroller.
The processor 602 for executing the instruction stored in memory, can be avoided power grid it is unstable in the case where feedback net deteriorate power grid
Stable case, improve the stability of power grid.
It in one embodiment, can be as shown in fig. 7, the control device 700 of photovoltaic system includes memory 701 and place
Manage device 702.Processor 702 is coupled to memory 701 by BUS bus 703.The control device 700 of the photovoltaic system can be with
External memory 705 is connected to call external data by memory interface 704, can also be connected by network interface 706
It is connected to network or an other computer system (not shown).It no longer describes in detail herein.
In this embodiment, it is instructed by memory stores data, then above-metioned instruction is handled by processor, can be avoided
Feedback net deteriorates the stable case of power grid in the case that power grid is unstable, improves the stability of power grid.
In another embodiment, a kind of computer readable storage medium, is stored thereon with computer program instructions, this refers to
The step of enabling the method in the control method corresponding embodiment for realizing photovoltaic system when being executed by processor.Technology in the art
Personnel are it should be appreciated that embodiment of the disclosure can provide as method, apparatus or computer program product.Therefore, the disclosure can be used
The form of complete hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects.Moreover, the disclosure
Can be used can use non-transient storage medium (packet in the computer that one or more wherein includes computer usable program code
Include but be not limited to magnetic disk storage, CD-ROM, optical memory etc.) on the form of computer program product implemented.
The schematic diagram of some embodiments of the photovoltaic system of the disclosure is as shown in Figure 8.
Photovoltaic device 801 can produce electricl energy, and the electric energy of generation can supply load 802 and use, can also be in photovoltaic system
AC network is fed back under the control of the control device 803 of system.Load 802 can consume the electric energy of photovoltaic device generation or come from
The electric energy of AC network works.The control device 803 of photovoltaic system can be any one being mentioned above.
In such photovoltaic system, the control device of photovoltaic system can be cut photovoltaic system according to the state of AC network
It is changed to non-feedback net state, so that feedback net deteriorates the stable case of power grid in the case where avoiding power grid unstable, improves power grid
Stability.
In some embodiments, in photovoltaic system 900, photovoltaic device can be closed with various electrical appliances and be set, such as PV air-conditioner,
It is air-conditioning power supply using the direct current that photovoltaic module generates, while extra electric energy can be fed back to AC network.The disclosure
The schematic diagram of other embodiments of photovoltaic system 900 is as shown in Figure 9:
Photovoltaic input can input for the photovoltaic battery panel of single branch, can also input simultaneously for multi-channel photovoltaic cell plate.
Photovoltaic module and DC-DC circuit may be implemented to convert the electric energy that photovoltaic inputs to certain voltage or a certain range electricity
Pressure, wherein DC-DC circuit can also be able to be the corresponding circuit with serial or parallel connection function for independent DC--DC circuit.DC-DC
Circuit can have the topological or corresponding topology of DC to DC function for BUCK, BOOST, flyback, normal shock, half-bridge, full-bridge etc.
The deformation of circuit, commonly uses BOOST or it derives topology, and photovoltaic module can be the individual integration module with corresponding function,
It can also be the module being combined by corresponding discrete device.
DC bus can be the DC voltage that fixed DC voltage is also wider range.Air-conditioning internal machine can be by pure direct current
Power supply or Alternating Current Power Supply.Outdoor machine of air-conditioner is pure direct current supply.The air-conditioning internal machine directly connecting with DC bus is either one
Machine can also be for machine in more direct-flow air conditioners in direct-flow air conditioner, and the outdoor machine of air-conditioner directly connecting with DC bus is either one straight
Flowing outdoor machine of air-conditioner can also be the outer machine of more direct-flow air conditioners.
AC network is the AC network with specific voltage grade and electric voltage frequency, may be either single-phase for three-phase.
Grid-connected module may be either integration module individually with corresponding function, can also be to be combined by corresponding discrete device
At DCAC circuit is two-way circuit, can convert the energy of DC bus to the energy of alternating current net side, can also be by AC network
The energy of side is converted into the energy of DC bus.
Such PV air-conditioner system can sufficiently meet in the state of default feedback net, according to grid side voltage, frequency
Size automatically switch feedback net and non-feedback net state, be not only not in the low problem of power quality that generates electricity, but also can also be maximum
The guarantee photovoltaic income of efficiency makes PV air-conditioner product realize automation control, does not need user's manual operation, sufficiently meets and use
Hommization demand in family enhances the self-regulation ability of system entirety.
The disclosure is reference according to the method for the embodiment of the present disclosure, the flow chart of equipment (system) and computer program product
And/or block diagram describes.It should be understood that each process in flowchart and/or the block diagram can be realized by computer program instructions
And/or the combination of the process and/or box in box and flowchart and/or the block diagram.It can provide these computer programs to refer to
Enable the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate
One machine so that by the instruction that the processor of computer or other programmable data processing devices executes generate for realizing
The device for the function of being specified in one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
So far, the disclosure is described in detail.In order to avoid covering the design of the disclosure, it is public that this field institute is not described
The some details known.Those skilled in the art as described above, completely it can be appreciated how implementing technology disclosed herein
Scheme.
Disclosed method and device may be achieved in many ways.For example, can by software, hardware, firmware or
Person's software, hardware, firmware any combination realize disclosed method and device.The step of for the method it is above-mentioned
Sequence is merely to be illustrated, and the step of disclosed method is not limited to sequence described in detail above, unless with other sides
Formula illustrates.In addition, in some embodiments, the disclosure can be also embodied as recording program in the recording medium, these
Program includes for realizing according to the machine readable instructions of disclosed method.Thus, the disclosure also covers storage for executing
According to the recording medium of the program of disclosed method.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the disclosure rather than its limitations；To the greatest extent
Pipe is described in detail the disclosure referring to preferred embodiment, it should be understood by those ordinary skilled in the art that: still
It can modify to the specific embodiment of the disclosure or some technical features can be equivalently replaced；Without departing from this public affairs
The spirit of technical solution is opened, should all be covered in the claimed technical proposal scope of the disclosure.
Claims (18)
1. a kind of control method of photovoltaic system, comprising:
Obtain the voltage value and frequency of AC network；
Feedback Running State is in photovoltaic system and there are in the case where the load of operating status:
If the average value of the voltage value is not located in the first predetermined voltage range, and the frequency is not located at scheduled frequency range
It is interior, then the photovoltaic system is switched to non-feedback net state.
2. according to the method described in claim 1, further include:
Non- feedback Running State is in photovoltaic system and there are in the case where the load of operating status:
If the average value of the voltage value is not located in the second predetermined voltage range or the frequency is not located at scheduled frequency range
Interior, then keeping the photovoltaic system is non-feedback net state.
3. according to the method described in claim 1, further include:
The voltage value average bits in the first predetermined voltage range or the frequency is located in scheduled frequency range
In the case of, keep the photovoltaic system for feedback Running State.
4. according to the method described in claim 2, further include:
Non- feedback Running State is in photovoltaic system and there are in the case where the load of operating status:
If the frequency is located in scheduled frequency range, and the average bits of the voltage value are in the second predetermined voltage range,
The photovoltaic system is then switched to feedback Running State.
5. method described in any one according to claim 1~4, further includes:
In the case where the voltage value is not located in third predetermined voltage range, the photovoltaic system is switched to protection shape
State.
6. according to the method described in claim 5, wherein, meeting at least one of following:
First predetermined voltage range and the third predetermined voltage range are centered on voltage rating；
The third predetermined voltage range is greater than first predetermined voltage range；Or,
The scheduled frequency range is centered on power grid standard frequency.
7. method according to claim 2 or 4, wherein meet at least one of following:
Second predetermined voltage range is centered on voltage rating；
Third predetermined voltage range is greater than second predetermined voltage range, wherein is not located at the third in the voltage value
In the case where in predetermined voltage range, the photovoltaic system is switched to guard mode；Or,
First predetermined voltage range is more than or equal to the second voltage range.
8. according to the method described in claim 6, wherein, meeting at least one of following:
First predetermined voltage range is [0.88 times of voltage rating, 1.1 times of voltage rating]；
The third predetermined voltage range is [0.8 times of voltage rating, 1.15 times of voltage rating]；Or
The scheduled frequency range is [power grid standard frequency -0.5Hz, power grid standard frequency+0.5Hz].
9. according to the method described in claim 7, wherein, meeting at least one of following:
First predetermined voltage range is [0.88 times of voltage rating, 1.1 times of voltage rating]；
Second predetermined voltage range is [0.9 times of voltage rating, 1.08 times of voltage rating]；
The third predetermined voltage range is [0.8 times of voltage rating, 1.15 times of voltage rating]；Or
The scheduled frequency range is [power grid standard frequency -0.5Hz, power grid standard frequency+0.5Hz].
10. method according to claim 1 or 2, further includes:
In the case where the load of operating status is not present in the photovoltaic system, feedback Running State is kept.
11. method according to claim 1 or 2, wherein the photovoltaic system is PV air-conditioner system.
12. a kind of control device of photovoltaic system, comprising:
Voltage acquisition unit is configured as obtaining the voltage value of AC network；
Frequency collection unit is configured as obtaining the frequency of AC network；
The case where switch unit is configured as in the case where photovoltaic system is in feedback Running State, and there are the loads of operating status
Under: if the average value of the voltage value is not located in the first predetermined voltage range, and the frequency is not located at scheduled frequency range
It is interior, then the photovoltaic system is switched to non-feedback net state.
13. control device according to claim 12, wherein the switch unit is additionally configured at photovoltaic system
In non-feedback Running State, and there are in the case where the load of operating status, if the average value of the voltage value is not located at second
In predetermined voltage range or the frequency is not located in scheduled frequency range, then keeping the photovoltaic system is non-feedback net state.
14. control device according to claim 12, wherein the switch unit is additionally configured in the voltage value
Average bits keep the light in the first predetermined voltage range or in the case that the frequency is located in scheduled frequency range
Volt system is feedback Running State.
15. control device according to claim 13, wherein the switch unit is additionally configured to be in photovoltaic system
Non- feedback Running State, and there are in the case where the load of operating status: if the frequency is located in scheduled frequency range, and institute
The average bits of voltage value are stated in the second predetermined voltage range, then the photovoltaic system are switched to feedback Running State.
16. a kind of control device of photovoltaic system, comprising:
Memory；And
It is coupled to the processor of the memory, the processor is configured to based on the instruction execution for being stored in the memory
Method as described in any one of claim 1 to 11.
17. a kind of computer readable storage medium, is stored thereon with computer program instructions, real when which is executed by processor
The step of method described in existing claim 1 to 11 any one.
18. a kind of photovoltaic system, comprising:
Photovoltaic device is configured as producing electricl energy；
Load is configured as consuming the electric energy that the photovoltaic device generates or the electric energy work from AC network；
With,
The control device of photovoltaic system described in claim 12~16 any one.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864806A (en) * | 2020-08-26 | 2020-10-30 | 珠海格力电器股份有限公司 | Photovoltaic equipment control method, device and equipment and photovoltaic system |
| CN112491088A (en) * | 2020-12-02 | 2021-03-12 | 珠海格力电器股份有限公司 | Converter and photovoltaic air conditioner |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6738692B2 (en) * | 2001-06-25 | 2004-05-18 | Sustainable Energy Technologies | Modular, integrated power conversion and energy management system |
| CN102185333A (en) * | 2011-04-19 | 2011-09-14 | 河南电力试验研究院 | Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid |
| CN102709946A (en) * | 2012-06-05 | 2012-10-03 | 国电南瑞科技股份有限公司 | Method for realizing seamless switching of micro-grid from grid-connection operation to isolated network operation |
| CN103091604A (en) * | 2013-01-29 | 2013-05-08 | 深圳市京泉华科技股份有限公司 | Island detection method and detection device for grid-connected photovoltaic power generation system |
| CN104078997A (en) * | 2014-06-26 | 2014-10-01 | 许继电气股份有限公司 | Photovoltaic grid-connected inverter grid-disconnecting mode and grid-connecting mode switching control method |
| AU2014101078A4 (en) * | 2014-09-05 | 2014-10-09 | Free Renewable Energy Enterprises Pty Ltd | Hybrid Solar Uninterrupted Power Supply and Off Grid Inverter, adaptable to most existing grid interactive solar systems. |
| CN104821607A (en) * | 2015-05-15 | 2015-08-05 | 东北大学 | Photovoltaic microgrid power equalization control method based on three-end cooperative control |
| US9118213B2 (en) * | 2010-11-24 | 2015-08-25 | Kohler Co. | Portal for harvesting energy from distributed electrical power sources |
| CN105425063A (en) * | 2015-11-08 | 2016-03-23 | 国网山东省电力公司潍坊供电公司 | New island protection control method based on wide area information |
| CN106208386A (en) * | 2016-08-31 | 2016-12-07 | 天津天大求实电力新技术股份有限公司 | A kind of intelligent switch control method being applicable to family's micro-capacitance sensor |
| CN106921146A (en) * | 2017-03-20 | 2017-07-04 | 特变电工西安电气科技有限公司 | The switching overvoltage protection device and method of a kind of multilevel photovoltaic grid-connected inverter |
-
2019
- 2019-07-31 CN CN201910698976.3A patent/CN110401223B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6738692B2 (en) * | 2001-06-25 | 2004-05-18 | Sustainable Energy Technologies | Modular, integrated power conversion and energy management system |
| US9118213B2 (en) * | 2010-11-24 | 2015-08-25 | Kohler Co. | Portal for harvesting energy from distributed electrical power sources |
| CN102185333A (en) * | 2011-04-19 | 2011-09-14 | 河南电力试验研究院 | Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid |
| CN102709946A (en) * | 2012-06-05 | 2012-10-03 | 国电南瑞科技股份有限公司 | Method for realizing seamless switching of micro-grid from grid-connection operation to isolated network operation |
| CN103091604A (en) * | 2013-01-29 | 2013-05-08 | 深圳市京泉华科技股份有限公司 | Island detection method and detection device for grid-connected photovoltaic power generation system |
| CN104078997A (en) * | 2014-06-26 | 2014-10-01 | 许继电气股份有限公司 | Photovoltaic grid-connected inverter grid-disconnecting mode and grid-connecting mode switching control method |
| AU2014101078A4 (en) * | 2014-09-05 | 2014-10-09 | Free Renewable Energy Enterprises Pty Ltd | Hybrid Solar Uninterrupted Power Supply and Off Grid Inverter, adaptable to most existing grid interactive solar systems. |
| CN104821607A (en) * | 2015-05-15 | 2015-08-05 | 东北大学 | Photovoltaic microgrid power equalization control method based on three-end cooperative control |
| CN105425063A (en) * | 2015-11-08 | 2016-03-23 | 国网山东省电力公司潍坊供电公司 | New island protection control method based on wide area information |
| CN106208386A (en) * | 2016-08-31 | 2016-12-07 | 天津天大求实电力新技术股份有限公司 | A kind of intelligent switch control method being applicable to family's micro-capacitance sensor |
| CN106921146A (en) * | 2017-03-20 | 2017-07-04 | 特变电工西安电气科技有限公司 | The switching overvoltage protection device and method of a kind of multilevel photovoltaic grid-connected inverter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864806A (en) * | 2020-08-26 | 2020-10-30 | 珠海格力电器股份有限公司 | Photovoltaic equipment control method, device and equipment and photovoltaic system |
| CN111864806B (en) * | 2020-08-26 | 2021-11-30 | 珠海格力电器股份有限公司 | Photovoltaic equipment control method, device and equipment and photovoltaic system |
| WO2022041919A1 (en) * | 2020-08-26 | 2022-03-03 | 珠海格力电器股份有限公司 | Method, apparatus, and device for controlling photovoltaic device, and photovoltaic system |
| CN112491088A (en) * | 2020-12-02 | 2021-03-12 | 珠海格力电器股份有限公司 | Converter and photovoltaic air conditioner |
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| Publication number | Publication date |
|---|---|
| CN110401223B (en) | 2021-04-27 |
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