CN103988138B - Automatic voltage for photovoltaic system regulates - Google Patents
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- CN103988138B CN103988138B CN201280013081.8A CN201280013081A CN103988138B CN 103988138 B CN103988138 B CN 103988138B CN 201280013081 A CN201280013081 A CN 201280013081A CN 103988138 B CN103988138 B CN 103988138B
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- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 21
- 230000033228 biological regulation Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000000052 comparative effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000002045 lasting effect Effects 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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Abstract
The invention discloses a kind of photovoltaic system, described photovoltaic system includes solaode and photovoltaic DC-to-AC converter (110), and described photovoltaic DC-to-AC converter (110) is configured to the converting direct-current power into alternating-current power that will be produced by described solaode.Measure the line voltage at interconnection point (POI) (204) place of described photovoltaic system and described electrical network, and described line voltage is compared with setting value.Line voltage based on described measurement produces control signal.Described control signal is provided to described photovoltaic DC-to-AC converter (110).Regulate described control signal, so that described photovoltaic DC-to-AC converter (110) is generated or absorbed by reactive power, to respond instantaneous grid voltage change.
Description
Technical field
The embodiment of theme described herein relates generally to photovoltaic system.More particularly, the embodiment of described theme relates to the automatic voltage regulation of photovoltaic system.
Background technology
Photovoltaic system utilizes solar radiation to generate electricity.Photovoltaic system can include that the array of solar panel, the most each solar panel include the solaode of interconnection.Solaode includes p-type and N-type diffusion region.Impact solar radiation on the solar cell produces electronics and the hole migrating to diffusion region, thus forms voltage difference between diffusion region.Overleaf in contact solar battery, diffusion region and the metal contact piece being connected with them are respectively positioned on the back side of solaode.Contact allows to be connected on solaode and by solar cell for supplying power external circuit.
The unidirectional current produced by solaode is converted into the alternating current being suitable to be attached to electrical network at interconnection point (POI) by photovoltaic DC-to-AC converter.Line voltage at POI is regulated to special value, to meet demand.Embodiments of the invention relate to automatically regulate the method and system of the voltage being delivered to electrical network by photovoltaic system.
Summary of the invention
In one embodiment, automatically regulate the method for the voltage produced by photovoltaic system include measuring by photovoltaic system carry at the voltage with the interconnection point (POI) of electrical network.Measured line voltage is compared with set point voltage.Comparative result based on measured line voltage Yu set point voltage produces inverter reference voltage.Inverter reference voltage is provided to photovoltaic DC-to-AC converter in the position of photovoltaic DC-to-AC converter.Regulation inverter reference voltage is with the line voltage of response Fast Persistence change.
In another embodiment, photovoltaic system includes multiple solaode, multiple photovoltaic DC-to-AC converter and power plant controller.Power plant controller is configured to regulate inverter reference voltage based on the measurement voltage that interconnection point (POI) place at photovoltaic system Yu electrical network records, and the photovoltaic DC-to-AC converter provided to the plurality of photovoltaic DC-to-AC converter by inverter reference voltage exports and the line voltage of the response lasting change at POI with the reactive power regulating this photovoltaic DC-to-AC converter.
In another embodiment, the method automatically regulating the voltage produced by photovoltaic system includes measuring by the voltage of photovoltaic system offer to electrical network.Control signal is produced to control the operation of photovoltaic DC-to-AC converter based on measured voltage.Change in response to measured voltage regulates control signal, to regulate the reactive power output of photovoltaic DC-to-AC converter.
Those of ordinary skill in the art is after reading the disclosure full text including drawings and claims, and these and other features of the present invention will be apparent from for them.
Accompanying drawing explanation
When considering in conjunction with the following drawings, can be more fully understood from described theme by seeing detailed description of the invention and claims, the most in all of the figs, similar reference refers to the element being similar to.
Fig. 1 schematically shows the assembly of photovoltaic system according to an embodiment of the invention.
Fig. 2 schematically shows the add-on assemble of the photovoltaic system of Fig. 1 according to an embodiment of the invention.
Fig. 3 shows according to an embodiment of the invention for the flow chart of automatic voltage control method of photovoltaic system.
Fig. 4 schematically shows other details of the photovoltaic system of Fig. 2 according to an embodiment of the invention.
Detailed description of the invention
In the present invention, it is provided that many concrete details, such as equipment, parts and the example of method, thus obtain the comprehensive understanding to the embodiment of the present invention.But, those of ordinary skill in the art is it will be appreciated that the present invention can implement in the case of one or more in not having described detail.In other cases, not shown or describe known to details, with the aspect of the present invention that avoids confusion.
Fig. 1 schematically shows the assembly of photovoltaic system 200 according to an embodiment of the invention.Photovoltaic system assembly shown in the example of Fig. 1 includes multiple header box 112, multiple solar panel 114 and photovoltaic DC-to-AC converter 110.Photovoltaic system can include multiple inverter, but for the sake of clearly illustrating, illustrate only one in Fig. 1.Solar panel 114 includes the solaode being arranged on the electrical connection on same framework.In one embodiment, each solar panel 114 includes the back-contact solaode 115 of multiple series connection.May be used without above contact solar battery.The most only marked some in back-contact solaode 115.
Photovoltaic string include such as Fig. 1 in the solar panel 114 of multiple series connection.One group of solar panel 114 is electrically connected to header box 112, and wherein solar panel 114 is be connected in series.Electrical connection header box 112 so that all solar panels 114 in photovoltaic string are series connection.Such as, the output of photovoltaic string is electrically connected to inverter 110, solaode 115 unidirectional current (DC) produced is converted into the alternating current (AC) being suitable to be delivered to utility network by described inverter 110.
Fig. 2 schematically shows the add-on assemble of photovoltaic system 200 according to an embodiment of the invention.Fig. 2 shows and combines the inverter 110 that Fig. 1 describes.For the sake of clearly illustrating, solar panel 114 not shown in Fig. 2.In the example of figure 2, during the assembly of photovoltaic system 200 is positioned at photovoltaic transformer station 210 and inverter block 220.
Inverter block 220 is the general areas at inverter place.Inverter block 220 be usually arranged as away from transformer station 210(its away from the interconnection point (POI) 204 with electrical network).Communication module 201 allows to carry out between inverter 110 and the assembly being arranged in transformer station 210 data communication.Inverter block 220 may also include the add-on assemble being not shown explicitly in Fig. 2, such as analog-digital converter, digital to analog converter and for supporting other assemblies of the operation of inverter 110.
In one embodiment, using supervisory control and data acquisition system (SCADA) to control the operation of photovoltaic system 200, wherein power plant controller 202 serves as central control computer.In one embodiment, inverter 110, power plant controller 202 and transformer substation computer 203 communicate according to Modbus tcp/ip communication agreement.In this embodiment, communication module 201 includes Ethernet switch, and described Ethernet switch provides data link between the assembly of photovoltaic system 200.Also can be monitored by sending analogue signal (such as by providing the independent distribution for signal) and control.
In the example of figure 2, the AC output voltage of inverter 110 is increased to higher voltage for distribution to transformer station 210 by the booster transformer in inverter block 220.
The AC voltage received from inverter block 220 is boosted and is then coupled to POI204, for distribution to electrical network (not shown) by electromotor boosting (GSU) transformator in transformer station 210 further.Transformer substation computer 203 allows transformer station 210 to be controlled and monitor.Transformer substation computer 203 can be configured to control protection electric circuit and reads the voltage at POI204 by instrument 205.
Power plant controller 202 in transformer station 210 can be configured to be conducive to control special-purpose computer or the general purpose computer of the voltage at POI204 (near or).As hereinafter will become apparent from, power plant controller 202 can be conducive to the control signal being processed inverter reference voltage form by manipulation to control the voltage at POI204.
The voltage at interconnection point can be controlled by automatic voltage regulation (AVR).In general, AVR can relate to handle the reactive power input/output of photovoltaic system by handling idle (or power factor) setting value at inverter, with control with distribution, transmission of electricity or other interconnection points being electrically connected to form of electrical network at voltage.AVR can also be used for the operation coordinating photovoltaic system with reactive power source (such as static VAR compensator and capacitance group).
Although AVR self can adapt to the line voltage persistently changed, but in some cases, this adaptation process may be the slowest.Such as, when AVR controller attempts to reduce line voltage (e.g., electrical network is 1.03pu, and AVR setting value is 1.02pu) by the substantial amounts of reactive power of absorption, inverter terminal voltage can be in lower value (e.g., 0.96pu) because of the impedance of the AC acquisition subsystem in power plant.It is lower than the voltage at interconnection point by 7% more than that this may result in inverter terminal voltage.If the declining suddenly of line voltage (such as dropping to 0.97pu) is faster than the response time of AVR controller and inverter still at absorbing reactive power, then inverter terminal voltage can decline the lowest (as, it is down to 0.90pu), and inverter tripping can be caused because inverter is generally of narrow operation window (it can be +/-10%).The problem slow in order to solve the response time of common AVR enforcement, embodiments of the invention produce and handle control signal, the grid conditions persistently changed to allow inverter to quickly adapt to.
Fig. 3 shows according to an embodiment of the invention for the flow chart of automatic voltage control method of photovoltaic system.For illustrative purposes, the method that Fig. 3 explained by the assembly of Fig. 2 is used.
In the example of fig. 3, power plant controller 202 serves as AVR controller.Power plant controller 202 receives reference voltage VREFThe set point voltage of form.Reference voltage VREF(such as) SCADA source or data processing gateway can be received from.Reference voltage VREFCorresponding to predetermined, the desired regulation voltage levvl at POI204.
In one embodiment, the change of inverter reference voltage that inverter 110 is configured to exist with the end of the inverter 110 at inverter block 220 is to be generated or absorbed by reactive power.The example of the commercially available inverter with this ability includes deriving from those of Sma Solar Technology AG (SMA Solar Technology AG) of Germany.It is used as other suitable inverters.When regulating inverter reference voltage in response to the too high voltages (e.g., higher than threshold voltage) at POI204, inverter 110 can absorb reactive power to reduce the voltage at POI204.Similarly, when regulating inverter reference voltage in response to the mistake low-voltage (e.g., less than threshold voltage) at POI204, inverter 110 can produce reactive power to raise the voltage at POI204.Inverter electronic device is particularly suited for this function, and some commercially available inverters 110 have soon to the response time in one or several AC cycle.The fast response time of inverter 110 allows to be maintained at inverter terminal voltage in its operation window respond instantaneous grid voltage change, and also allows inverter 110 to produce reactive power of meeting an urgent need when utility network demand maximum.
Due to the impedance in AC slip ring system, voltage at POI204 and big difference can be there is between the voltage of the end of inverter 110.That is, the voltage of the end of the inverter 110 at inverter block 220 may not be identical with the voltage at POI204.
According to embodiment, power plant controller 202 receives the voltage readings at POI204 from instrument 205.Power plant controller 202 produces error signal VERR, this error signal instruction required voltage (Vref) at POI204 and the virtual voltage (V at POI204METERDifference between).Thering is provided error signal to compensator 403, described compensator 403 produces inverter reference voltage V based on error signalINV_REFThe control signal of form.Compensator 403 regulates inverter reference voltage VINV_REF, so that the error minimize between required voltage and the virtual voltage at POI204.Compensator 403 regulates inverter reference voltage V in minimum (" Min ") value and maximum (" Max ") valueINV_REF.In one embodiment, compensator 403 proportion of utilization integration (PI) control program produces inverter reference voltage VINV_REF.Other control programs spendable include ratio, integration, differential, proportional, integral, Integrated Derivative, proportional-plus-derivative and proportional-integral-differential.
Inverter 110 receives inverter reference voltage VINV_REFAnd it is subsequently based on inverter reference voltage VINV_REFValue be generated or absorbed by reactive power.Feedback cycle persistently carries out being maintained at by the voltage at POI204 in the range of the regulation voltage specified by set point voltage, and described set point voltage is by reference voltage VREFRepresent.
Fig. 4 schematically shows other details of photovoltaic system 200 according to an embodiment of the invention.
In the example in figure 4, functional device 401-408 and 410-413 are performed by power plant controller 202.It is understood that these functions can be realized by the combination of software, hardware or hardware/software.Such as, power plant controller 202 can include having hardware interface and the computer of associated drive software, described hardware interface be used for simulating input directly measure and control, data communication (as, Ethernet Adaptation Unit), data acquisition (as, receive signal) and control (e.g., sending control signal).The available application specific processor being combined with application software of power plant controller 202 or coprocessor are to perform its function.Power plant controller 202 can configure with principal and subordinate with other controllers and use, to coordinate the operation of photovoltaic system 200 and reactive power source (such as static VAR compensator and capacitance group).
Seeing Fig. 4, power plant controller 202 receives the reference voltage V being used as set point voltageREF, described set point voltage is for being set in the voltage at POI204.Adder 401 is based on by reference voltage VREFThe required voltage at POI204 pointed out and the voltage (V at POI204 measured by instrument 205METERDifference between) produces error signal VERR。
In one embodiment, reference voltage VREFWith instrument voltage readings VMETERPower plant controller 202 processes as digital signal.These voltage can utilize analog-digital converter (ADC) be converted into numeral, and provided to power plant controller 202 by data communication network subsequently.As instantiation, can be by ModbusTCP depositor by reference voltage VREFWith instrument voltage readings VMETERThere is provided to power plant controller 202.The order received by power plant controller 202 and input (are included reference voltage VREFWith instrument voltage readings VMETER) bounds checking can be carried out.
Reference voltage V in photovoltaic systemREF, instrument voltage readings VMETER, and other voltage/currents can be represented by other kinds of signal (wherein the remainder of photovoltaic system 200 being carried out suitable change).Such as, voltage signal can be represented by current signal, and vice versa.And for example, the voltage and current in photovoltaic system can use RMS(root-mean-square) represent.
Dump dead band function (block 402) can enable according to application or not enable.Dump dead band function allowable error voltage VERRChange in certain scope, and be sent to the control signal of inverter 110 without regulation.More particularly, when line voltage (i.e., voltage at POI204) when being positioned at border (usually nominal ± 1%), dump dead band function allows the input value being sent to compensator 403 become big or diminish, and inverter 110 is remained reference voltage setting value, so that inverter 110 exports integer power factor.In other words, if line voltage is in the range of (such as) ± 1%, then the input value being sent to compensator 403 is the most just line voltage.If line voltage is positioned at the dead band limit, then this also results in inverter 110 and exports integer power factor.
In one embodiment, compensator 403 includes PI compensator.PI compensator 403 can be absolute, it means that inverter reference voltage VINV_REFBased on error signal VERRAnd the proportional gain (Kp) of PI compensator 403 and storage gain (Ki) bias up or down.But, inverter reference voltage VINV_REFReference voltage V can be passed throughREFAnd keep stable.Compensator 403 is alternatively increment.Compensator 403 can have integral windup protection and saturation limit.Can because of occur grid disturbance time trigger logic state machine start or disable compensator 403.
Voltage limit selects function (block 404) to be configured to reduce based on the input deriving from power factor limiter (sub-loop 431) and reactive power limiter (sub-loop 432) sub-loop or the inverter reference voltage V of boost compensation device 403INV_REFOutput.Voltage limit selects function point analysis inverter reference voltage VINV_REFSo that inverter 110 does not produce beyond the power factor limit (the PF limit) and the output of reactive power auxiliary service (the Q limit).
Power factor limiter sub-loop (sub-loop 431) is configured to when the power factor measured at POI204 by instrument 205 is close, limit inverter reference voltage V when being equal to or exceed the power factor limit (the PF limit)INV_REF.The power factor reading deriving from instrument 205 is filtered by power factor wave filter (PF wave filter), and compares (block 413) with the power factor limit subsequently.Power factor limiter sub-loop has the compensator 410 of himself because the power factor at POI204 due to flow through the impedance variation of the actual power of power plant AC slip ring system and may not be identical with the power factor in inverter end.Compensator 410 can use PI or other control programs.
Reactive power limiter sub-loop (sub-loop 432) is configured to when the reactive power measured at POI204 by instrument 205 is close, be equal to or limit during reactive power auxiliary service (Q restriction) the reactive power output of inverter 110.The reactive power reading deriving from instrument 205 is filtered by reactive power wave filter (Q wave filter), and compares (block 412) subsequently with reactive power auxiliary service.Reactive power sub-loop has the compensator 411 of himself because the reactive power factor at POI204 due to flow through the impedance variation of the actual power of power plant AC slip ring system and may not be identical with the reactive power in inverter end.Compensator 411 can use PI or other control programs.
Overall rate limitation function (block 405) limits inverter reference voltage VINV_REFRate of change.This can prevent inverter reference voltage VINV_REFQuickly and drastically change.
Inverter bias capability (block 406) be configured to by revise each inverter reference voltage (the need to) compensate inverter stop transport.Inverter bias capability can bias each inverter reference voltage up or down based on the inverter bias calculated by reactive power equilibrium device function (block 408).Reactive power equilibrium device functional check derives from the reactive power output of all inverters 110 just communicated with power plant controller 202.If other inverters 110 of particular inverter 110 direct ratio export/absorb more reactive power, then for the independent inverter reference voltage V of this particular inverter 110INV_REFTo be adjusted the most up or down.Reactive power equilibrium device function directly can read the output of inverter reactive power from inverter terminal.For reactive power equilibrium device 408, there is multiple reactive power wave filter (Q wave filter) and reactive power input, but for the sake of clearly illustrating, Fig. 4 illustrate only one group.
Inverter bias capability can periodically receive beat signals from each inverter 110, to detect inverter stoppage in transit.Thering is provided before corresponding inverter 110, for each single inverter reference voltage VINV_REFApply single rate-limiting feature (block 407).In one embodiment, by ModbusTCP depositor by inverter reference voltage VINV_REFThere is provided to corresponding inverter 110.Inverter reference voltage V is read from depositorINV_REFAnd converting thereof into analog voltage signal, then described analog voltage signal provides the terminal of inverter 110 at inverter block 220, described inverter 110 is positioned in inverter block 220.
The present invention has been disclosed the automatic voltage regulation technology of the improvement for photovoltaic system.Although having been provided for the specific embodiment of the present invention, but it is to be understood that these embodiments are illustrative purpose, rather than limit.By reading the present invention, many further embodiments will be apparent from for the ordinary skill in the art.
Claims (17)
1. the method automatically regulating the voltage produced by photovoltaic system, including:
Measure by photovoltaic system carry at the voltage with the interconnection point of electrical network to produce measurement
Line voltage；
Being compared with reference voltage by the line voltage of described measurement, described reference voltage refers to
Show the set point voltage for described interconnection point；
Line voltage based on described measurement produces inverse with the comparative result of described reference voltage
Become device reference voltage；
Described inverter reference voltage is provided to described photovoltaic in the position of photovoltaic DC-to-AC converter
Inverter, solaode the unidirectional current produced is converted into exchange by described photovoltaic DC-to-AC converter
Electricity is for being delivered to described electrical network；And
Regulate described inverter reference voltage to respond the instantaneous change of the line voltage of described measurement
Change, wherein
When the line voltage of described measurement indicates described line voltage higher than threshold voltage, adjust
Save described inverter reference voltage, so that described photovoltaic DC-to-AC converter absorbing reactive power, work as institute
State measurement line voltage indicate described line voltage less than threshold voltage time, regulate described inverse
Become device reference voltage, so that described photovoltaic DC-to-AC converter produces reactive power.
Method the most according to claim 1, wherein said inverter reference voltage is by compensator root
Produce according to control program.
Method the most according to claim 2, wherein said control program includes that proportional integral compensates
Device.
Method the most according to claim 1, also includes:
Limit the rate of change of described inverter reference voltage.
Method the most according to claim 1, also includes:
Based on the reactive power produced by described photovoltaic DC-to-AC converter and by described photovoltaic system
The comparative result of the reactive power that other photovoltaic DC-to-AC converters produce limits described inverter reference
Voltage.
Method the most according to claim 1, wherein said solaode includes being arranged on the sun
Back-contact solaode in energy cell panel.
Method the most according to claim 1, wherein by posting via data communication network transmission
Described inverter reference voltage is provided to described photovoltaic DC-to-AC converter by storage.
8. a photovoltaic system, including:
Multiple solaodes；
Multiple photovoltaic DC-to-AC converters, the plurality of photovoltaic DC-to-AC converter is configured to by described many
The converting direct-current power into alternating-current power that individual solaode produces；And
Power plant controller, described power plant controller be configured to based on photovoltaic system with
The measurement voltage measured at the interconnection point of electrical network regulates inverter reference voltage, and by institute
State inverter reference voltage and a photovoltaic inversion to the plurality of photovoltaic DC-to-AC converter is provided
Device, exports with the reactive power of a photovoltaic DC-to-AC converter described in regulation and responds described
The line voltage of the lasting change at interconnection point, wherein
When described measurement voltage indicates described line voltage higher than threshold voltage, regulation is described
Inverter reference voltage, so that described photovoltaic DC-to-AC converter absorbing reactive power, when described measurement
When voltage indicates described line voltage less than threshold voltage, regulate described inverter reference electricity
Pressure, so that described photovoltaic DC-to-AC converter produces reactive power.
Photovoltaic system the most according to claim 8, also includes that instrument, described instrument are constructed use
In measuring the described measurement voltage at described interconnection point.
Photovoltaic system the most according to claim 8, also includes multiple switch, the plurality of friendship
Change planes and the data communication between described power plant controller and the plurality of photovoltaic DC-to-AC converter is provided
Link.
11. photovoltaic systems according to claim 8, wherein said power plant controller is constructed use
In the rate of change limiting described inverter reference voltage.
12. photovoltaic systems according to claim 8, wherein said power plant controller is by described inverse
Become device reference voltage to be provided in digital form to a described photovoltaic by data communication network
Inverter.
13. photovoltaic systems according to claim 8, wherein said power plant controller is configured to
Inverse with by the plurality of photovoltaic based on the reactive power produced by a described photovoltaic DC-to-AC converter
The comparative result becoming the reactive power that other photovoltaic DC-to-AC converters in device produce limits described inverse
Become device reference voltage.
14. 1 kinds of methods automatically regulating the voltage produced by photovoltaic system, described method includes:
Measure and provided to the voltage with the interconnection point of electrical network by photovoltaic system, to produce measurement
Voltage；
Produce control signal, to control the operation of photovoltaic DC-to-AC converter, described control signal based on
Described measurement voltage produces；And
Change in response to described measurement voltage regulates described control signal, described with regulation
The reactive power output of photovoltaic DC-to-AC converter, the step wherein regulating described control signal includes:
Described control signal is regulated based on the difference between described measurement voltage and reference voltage, with
Described photovoltaic DC-to-AC converter is made to absorb or output reactive power.
15. methods according to claim 14, wherein said control signal includes voltage signal, institute
State voltage signal to provide to described photovoltaic DC-to-AC converter in the position of described photovoltaic DC-to-AC converter.
16. methods according to claim 14, wherein said measurement voltage described photovoltaic system with
Measure at the interconnection point of described electrical network.
17. methods according to claim 14, wherein said photovoltaic DC-to-AC converter will be by back-contact
The converting direct-current power into alternating-current power that solaode produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906296.2A CN107026470A (en) | 2011-03-14 | 2012-02-27 | Automatic voltage for photovoltaic system is adjusted |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/047,005 | 2011-03-14 | ||
| US13/047,005 US8922062B2 (en) | 2011-03-14 | 2011-03-14 | Automatic voltage regulation for photovoltaic systems |
| PCT/US2012/026791 WO2012125278A2 (en) | 2011-03-14 | 2012-02-27 | Automatic voltage regulation for photovoltaic systems |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610906296.2A Division CN107026470A (en) | 2011-03-14 | 2012-02-27 | Automatic voltage for photovoltaic system is adjusted |
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| CN103988138A CN103988138A (en) | 2014-08-13 |
| CN103988138B true CN103988138B (en) | 2016-11-30 |
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Granted publication date: 20161130 Termination date: 20190227 |