CN104104085A - Feedforward voltage drop and surge compensation device based on solar photovoltaic power generation, and method - Google Patents
Feedforward voltage drop and surge compensation device based on solar photovoltaic power generation, and method Download PDFInfo
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- CN104104085A CN104104085A CN201410300882.3A CN201410300882A CN104104085A CN 104104085 A CN104104085 A CN 104104085A CN 201410300882 A CN201410300882 A CN 201410300882A CN 104104085 A CN104104085 A CN 104104085A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a feedforward voltage drop and surge compensation device based on solar photovoltaic power generation. The compensation device comprises a solar photovoltaic cell panel, a direct current voltage boosting unit, an H bridge inversion unit, a transformer, a grid-connected inverter, a direct current chopper unit, a direct current detection device, a direct current voltage detection device, an alternating current voltage detection device and a controller, wherein the controller is connected with the direct current detection device, the direct current voltage detection device and the direct current voltage boosting unit respectively, judges a working state of a grid according to an alternating current voltage value transmitted by the alternating current voltage detection device to control the H bridge inversion unit to output alternating current voltage to compensate voltage drop or surge of the grid, controls the grid-connected inverter to inject electric energy into the grid, and controls the direct current chopper unit to release the electric energy. The invention further discloses a method for compensating the voltage drop and the surge based on the compensation device.
Description
Technical field
The present invention relates to a kind of voltage compensating device and method, relate in particular to a kind of voltage compensating device and method based on photovoltaic generation.
Background technology
Developed country is very high to the requirement of quality of power supply level, power quality problem not only can bring very large economic loss to industrial quarters, as stopped work and restarting, cause production cost to increase, the damage equipment that is quick on the draw, scrap semi-finished product, reduce product quality, cause marketing difficulty and infringement corporate image and and user's good commercial relations etc., and bring harm can to the equipment of the important electricity consumption such as medical treatment department, cause serious production and interruption of service.EPRI-Electric Power Research Institute (EPRI) studies show that, power quality problem causes American industry in data every year, and the loss in material and productivity reaches 30,000,000,000 dollars (Electric Power Research Institute, 1999); The developed countries such as Japan require also very high to the quality of power supply.Along with developing rapidly of China's high-technology industry, requirement to quality of power supply level is more and more higher, voltage falls, surge is subject matter wherein, although voltage falls, the surge duration is short, but it can cause interruption or the shut-down of industrial process, and cause industrial process downtime be far longer than of accident itself time, the loss therefore causing is very large.
Traditional method, as voltage regulator can not address these problems, though and uninterrupted power supply UPS device can address these problems, but its cost and operating cost are all extremely expensive.In order to address the above problem, dynamic voltage compensator has been carried out to research both at home and abroad.Than UPS, dynamic voltage compensator can effectively solve the problem that voltage is subside, and still, energy storage problem is perplexing the research of dynamic voltage compensator always, although someone proposes the advanced methods such as least energy injection method, extra energy storage affects all the time it and further promotes, develops.
Summary of the invention
One of object of the present invention is to provide a kind of feed-forward type voltage based on solar energy power generating and falls surge compensation arrangement, it utilizes solar energy power generating to fall surge to the voltage in electrical network and compensates, thereby guarantee that load voltage does not change, and then protected load; Meanwhile, this device can utilize solar energy power generating to supply with for electrical network electric energy provides to supplement, thereby does not need to arrange extra energy-storage travelling wave tube.
Another object of the present invention is to provide and a kind ofly adopts the above-mentioned feed-forward type voltage based on solar energy power generating to fall surge compensation arrangement to carry out the method that voltage falls surge compensation.
In order to achieve the above object, the invention provides a kind of feed-forward type voltage based on solar energy power generating and fall surge compensation arrangement, it comprises:
Solar photovoltaic cell panel, it converts solar energy into direct current output;
DC boosting unit, its input is connected with the output of solar photovoltaic cell panel;
H bridge inversion unit, its DC bus is connected with the output of described DC boosting unit;
Transformer, its primary coil is connected with the ac output end of described H bridge inversion unit, and the secondary coil of transformer is used for being serially connected in electrical network;
Combining inverter, its DC bus is connected with the output of described DC boosting unit, and the ac output end of combining inverter is for being connected with electrical network;
Direct current chopper unit, its DC bus is connected with the output of described DC boosting unit;
Direct current detection device, it is connected with the output of DC boosting unit, to detect the electric current of DC boosting unit output;
DC voltage detecting device, it is connected with the output of DC boosting unit, to detect the voltage of DC boosting unit output;
Alternating voltage checkout gear, it is in order to be connected with electrical network, with the voltage of detection of grid;
Controller, it is connected with described direct current detection device, DC voltage detecting device and DC boosting unit respectively, described controller receives DC current values and the DC voltage value of direct current detection device and DC voltage detecting device transmission, so that DC boosting unit is carried out to maximal power tracing control; Described controller is also connected with alternating voltage checkout gear, H bridge inversion unit, combining inverter and direct current chopper unit, described controller is according to the operating state of the ac voltage judgement electrical network of alternating voltage checkout gear transmission, to control H bridge inversion unit output AC voltage, line voltage is fallen or surge compensates, described controller is also controlled combining inverter and is injected electric energy to electrical network, and controls direct current chopper unit release electric energy.
Feed-forward type voltage based on solar energy power generating of the present invention falls in surge compensation arrangement, and described controller can be electronic device or the smart machines such as digital signal processor, single-chip microcomputer, computer; Describedly judge that the operating state of electrical network comprises that whether detection of grid voltage U s is normal, as whether having voltage to fall or surge.The electric energy that device of the present invention produces solar photovoltaic cell panel is controlled distribution; Controller is according to the operating state of alternating voltage checkout gear output judgement electrical network; The operating state of judgement electrical network is when normal, and controller is controlled the electric energy that solar photovoltaic cell panel produces and injected to electrical network by combining inverter; When judgement electrical network generation voltage falls, control the electric energy of solar photovoltaic cell panel generation and export fast corresponding bucking voltage amount by H bridge inversion unit and transformer, the voltage of load end is remained unchanged, thereby protected load, the electric energy of simultaneously controlling solar photovoltaic cell panel generation injects to electrical network by combining inverter; During judgement electrical network generation voltage surge; control the electric energy of solar photovoltaic cell panel generation and export fast corresponding bucking voltage amount by H bridge inversion unit and transformer; the voltage of load end is remained unchanged; thereby protected load; utilize direct current Chopper unit to discharge the unnecessary energy of DC bus simultaneously, maintain the stable of DC bus-bar voltage.
Device of the present invention has utilized the solar energy of environmental protection, has solved line voltage and has fallen compensation and the energy storage problem with surge, and the combining inverter in device is taked feed-forward mode in addition, thereby does not increase the overhead provision of transformer and H bridge inversion unit.
Further, at the above-mentioned feed-forward type voltage based on solar energy power generating, fall in surge compensation arrangement, described controller comprises digital signal processor.
Further, at the above-mentioned feed-forward type voltage based on solar energy power generating, fall in surge compensation arrangement, described controller comprises single-chip microcomputer.
Further, at the above-mentioned feed-forward type voltage based on solar energy power generating, fall in surge compensation arrangement, described direct current detection device comprises DC current sensor.
Further, at the above-mentioned feed-forward type voltage based on solar energy power generating, fall in surge compensation arrangement, described DC voltage detecting device comprises direct current voltage sensor.
Further, at the above-mentioned feed-forward type voltage based on solar energy power generating, fall in surge compensation arrangement, described alternating voltage checkout gear comprises AC voltage sensor.
Correspondingly, the present invention also provides a kind of and has adopted the above-mentioned feed-forward type voltage based on solar energy power generating to fall surge compensation arrangement to carry out the method that voltage falls surge compensation, and it comprises step:
Adopt solar photovoltaic cell panel to convert solar energy into direct current output;
Adopt DC boosting unit that the direct current of solar photovoltaic cell panel output is converted to a galvanic current, and DC boosting unit is carried out to maximal power tracing control so that the direct current active power of DC boosting unit output is maximum;
Adopt H bridge inversion unit and combining inverter to change the direct current of DC boosting unit output into alternating current;
Detection of grid voltage U
swhether normal: if be judged as YES, making controller control H bridge inversion unit is zero to the alternating voltage of electrical network output, and controls whole electric energy injection electrical networks that combining inverter produces solar photovoltaic cell panel; If be judged as NO, further judge that electrical network voltage has occurred and fallen or voltage surge has occurred: if be judged as voltage, fall, control H bridge inversion unit to the alternating voltage U of electrical network output
j=U
s0-U
s, and control the remaining electric energy injection electrical network that combining inverter produces solar photovoltaic cell panel; If be judged as voltage surge, control H bridge inversion unit to the alternating voltage U of electrical network output
j=U
s0-U
s, and control direct current chopper unit and discharge the unnecessary electric energy that solar photovoltaic cell panel produces, to maintain DC bus-bar voltage stable of direct current chopper unit; U wherein
s0for electrical network standard alternating supply voltage value.
Voltage of the present invention falls surge compensation method and utilizes the feed-forward type voltage based on solar energy power generating of the present invention to fall the realization of surge compensation arrangement.Line voltage U
sby alternating voltage checkout gear, detect.
Further, the described step that DC boosting unit is carried out to maximal power tracing control is: controller detects the active power of DC boosting unit output, judge whether the active power of this output is greater than the active power of output last time, if be judged as YES, increase the duty ratio of DC boosting unit, if be judged as NO, the duty ratio that maintains DC boosting unit is constant.
Further, in said method, adopt respectively direct current detection device and DC voltage detecting device to detect the galvanic electric current I of DC boosting unit output
pvand voltage U
pv, to obtain the active-power P of DC boosting unit output
pv=U
pv* I
pv.
Further, in said method, work as 90%U
s0≤ U
s≤ 110%U
s0, judge that line voltage Us is for normal; Work as U
s< 90%U
s0, be judged as voltage and fall; Work as U
s> 110%U
s0, be judged as voltage surge.
Feed-forward type voltage based on solar energy power generating of the present invention falls surge compensation arrangement, has the following advantages:
1) can effectively solve line voltage and fall the compensation problem with surge, thus protection load;
2) adopt transformer mode, make applicable voltage range wider;
3) effectively utilized the solar energy of environmental protection, energy-storage units can be additionally set;
4) combining inverter in device is taked feed-forward mode, thereby does not increase the overhead provision of transformer and H bridge inversion unit.
Feed-forward type voltage based on solar energy power generating of the present invention falls surge compensation method and has equally above-mentioned advantage based on said apparatus.
Accompanying drawing explanation
Fig. 1 is that the feed-forward type voltage based on solar energy power generating of the present invention falls the structural representation of surge compensation arrangement under a kind of execution mode.
Fig. 2 is the H bridge inversion unit topological diagram that the feed-forward type voltage based on solar energy power generating of the present invention falls surge compensation arrangement.
Fig. 3 is the combining inverter topological diagram that the feed-forward type voltage based on solar energy power generating of the present invention falls surge compensation arrangement.
Fig. 4 is that the feed-forward type voltage based on solar energy power generating of the present invention falls the flow chart of surge compensation method under a kind of execution mode.
Embodiment
By the feed-forward type voltage based on solar energy power generating of the present invention being fallen to surge compensation arrangement according to specific embodiment and Figure of description, be described further below, but this explanation does not form inappropriate limitation of the present invention.
Fig. 1 has shown that the feed-forward type voltage based on solar energy power generating of the present invention falls a kind of embodiment of surge compensation arrangement.Fig. 2 and Fig. 3 have shown respectively H bridge inversion unit 3 in this embodiment and the topological diagram of combining inverter 8.
As shown in Figure 1, this device comprises: controller 1, DC boosting unit 2, H bridge inversion unit 3, transformer 4, direct current voltage sensor 5, DC current sensor 6, AC voltage sensor 7, combining inverter 8, direct current Chopper unit 9 and solar photovoltaic cell panel 10; Wherein, controller 1 is realized by CPU, and its core is digital signal processor; The DC boosting control end of controller 1 is connected with the corresponding control end in DC boosting unit 2, and the H bridge inversion control end of controller 1 is connected with the corresponding control end of H bridge inversion unit 3; The DC voltage input end of controller 1 is connected with the output of direct current voltage sensor 5, the direct current input of controller 1 is connected with the output of DC current sensor 6, the alternating current input of controller 1 is connected with the output of AC voltage sensor 7, the parallel network reverse control end of controller 1 is connected with the corresponding control end of combining inverter 8, and the direct current Chopper unit controls end of controller 1 is connected with the corresponding control end in direct current Chopper unit 9; The input of DC boosting unit 2 is connected with the output of solar photovoltaic cell panel 10, and the output of DC boosting unit 2 is connected with H bridge inversion unit 3, combining inverter 8 and the DC bus end of direct current Chopper unit 9; The ac output end of H bridge inversion unit 3 is connected with the two ends of the primary coil of transformer 4; The secondary coil of transformer 4 is serially connected in the power transmission line of electrical network, is connected respectively with the feeder ear S of electrical network with load end L; The input of direct current voltage sensor 5 is connected with the output of DC boosting unit 2; The input of DC current sensor 6 is serially connected with the output of DC boosting unit 2; The input of AC voltage sensor 7 is connected with mains supply end S; The DC bus end of combining inverter 8 is with the DC bus end of H bridge inversion unit 3, the DC bus end of the output of DC boosting unit 2 and direct current Chopper unit 9 is connected, and the ac output end of combining inverter 8 is connected with mains supply end S.As shown in Figure 2, the topological structure of H bridge inversion unit 3 comprises some triodes, and its connected mode is as figure, and in figure, DC+ and DC-are respectively positive pole and the negative pole of DC bus; AC is ac output end.As shown in Figure 3, the topological structure of combining inverter 8 comprises some triodes, and its connected mode is as figure, and in figure, DC+ and DC-are respectively positive pole and the negative pole of DC bus; AC is ac output end.
During this device work, the direct current that DC boosting unit 2 produces solar photovoltaic cell panel 10 is converted to a galvanic current output; Controller 1 receives DC current values and the DC voltage value of DC current sensor 6 and direct current voltage sensor 5 transmission, regulates the duty ratio of DC boosting unit so that DC boosting unit 2 is carried out to maximal power tracing control; Controller 1 is also according to the operating state of the ac voltage judgement electrical network of AC voltage sensor 7 transmission, to control H bridge inversion unit 3 output AC voltages, line voltage is fallen or surge compensates, specifically, controller 1 judges that, when the operating state of electrical network is normal, the electric energy that controller 1 is controlled solar photovoltaic cell panel 10 generations injects to electrical network by combining inverter 8; When judgement electrical network generation voltage falls, control the electric energy of solar photovoltaic cell panel 10 generations by H bridge inversion unit 3 and the corresponding bucking voltage amount of transformer 4 quick output, make the voltage U of load end L
lremain unchanged, thereby protected load, the electric energy of simultaneously controlling solar photovoltaic cell panel 10 generations injects to electrical network by combining inverter 8; During controller 1 judgement electrical network generation voltage surge, control the electric energy of solar photovoltaic cell panel 10 generations by H bridge inversion unit 3 and the corresponding bucking voltage amount of transformer 4 quick output, make the voltage U of load end L
lremain unchanged, thereby protected load, utilize direct current Chopper unit 9 to discharge the unnecessary energy of DC bus simultaneously, maintain the stable of DC bus-bar voltage.
Fig. 4 is that the feed-forward type voltage based on solar energy power generating of the present invention based on said apparatus falls the flow chart of surge compensation method under a kind of execution mode.
Incorporated by reference to Fig. 1, with reference to figure 4, the method is applied to said apparatus, passes through surveyed direct voltage U
pvwith direct current I
pvcalculate the power P of DC boosting unit output
pv, and it is carried out to maximal power tracing control; By the alternating supply voltage U of detection of grid
s, judge that whether grid ac voltage is normal, when finding that line voltage falls or during surge, controller 1 is controlled the corresponding alternating voltage variable quantity of H bridge inversion unit 3 output, this variable quantity is by 4 couples of load terminal voltage U of transformer
lcompensate, thereby make load terminal voltage U
lbe not subject to line voltage anomalous effects, control combining inverter 8 simultaneously the electric energy of solar photovoltaic cell panel 10 outputs is injected into electrical network; When line voltage surge causes that DC bus-bar voltage rises, by direct current Chopper unit 9, unnecessary energy is discharged.
Concrete steps are as follows:
1) by controller 1, measure alternating supply voltage U
s, DC boosting unit 2 output direct voltage U
pvwith direct current I
pv;
2) by controller 1, calculate DC boosting unit 2 active power of output P
pv: P
pv=U
pv* I
pv;
3) by controller 1, control the maximal power tracing that DC boosting unit 2 carries out solar energy power generating:
Judge this DC boosting unit 2 active power of output P
pvwhether be greater than output valve last time, if be judged as YES, increase the duty ratio of DC boosting unit, if be judged as NO, the duty ratio that maintains DC boosting unit is constant;
4) establish U
s0for electrical network alternating supply voltage value when normal, controller 1 is by AC voltage sensor 7 detection of grid voltage U
swhether normal:
If alternating supply voltage U
slower than normal voltage U
s090% time, be judged as line voltage and fall, controller 1 is controlled electric energy that solar photovoltaic cell panel 10 produces by the 3 output compensation of H bridge inversion unit, makes the voltage of transformer 4 outputs meet U
j=(U
s0-U
s) (the alternating voltage phase place of now transformer 4 outputs is identical with the phase place of line voltage), the electric energy simultaneously unnecessary solar photovoltaic cell panel 10 being produced passes through combining inverter 8 to electrical network injecting power;
If alternating supply voltage U
shigher than normal voltage U
s0110% time, be judged as line voltage surge, controller 1 is controlled electric energy that solar photovoltaic cell panel 10 produces by the 3 output compensation of H bridge inversion unit, makes the voltage of transformer 4 outputs meet U
j=(U
s0-U
s) (the alternating voltage phase place of now transformer 4 outputs and the single spin-echo of line voltage), by direct current Chopper unit 9, discharge unnecessary energy, thereby it is stable to maintain DC bus-bar voltage simultaneously.
If below either way do not meet, be judged as line voltage U
snormally, i.e. alternating supply voltage U
smeet 90%U
s0≤ U
s≤ 110%U
s0, controller 1 control H bridge inversion unit 3 is exported and is compensated for as zero, and making transformer 4 inject supply and AC line voltage distributions is zero, the electric energy of solar photovoltaic cell panel 10 generations is passed through to combining inverter 8 to electrical network injecting power simultaneously.
It should be noted that above cited embodiment is only specific embodiments of the invention.Obviously the present invention is not limited to above embodiment, and the similar variation of thereupon making or distortion are that those skilled in the art can directly draw or be easy to from content disclosed by the invention and just associate, and all should belong to protection scope of the present invention.
Claims (10)
1. the feed-forward type voltage based on solar energy power generating falls a surge compensation arrangement, it is characterized in that, comprising:
Solar photovoltaic cell panel, it converts solar energy into direct current output;
DC boosting unit, its input is connected with the output of solar photovoltaic cell panel;
H bridge inversion unit, its DC bus is connected with the output of described DC boosting unit;
Transformer, its primary coil is connected with the ac output end of described H bridge inversion unit, and the secondary coil of transformer is used for being serially connected in electrical network;
Combining inverter, its DC bus is connected with the output of described DC boosting unit, and the ac output end of combining inverter is for being connected with electrical network;
Direct current chopper unit, its DC bus is connected with the output of described DC boosting unit;
Direct current detection device, it is connected with the output of DC boosting unit, to detect the electric current of DC boosting unit output;
DC voltage detecting device, it is connected with the output of DC boosting unit, to detect the voltage of DC boosting unit output;
Alternating voltage checkout gear, it is in order to be connected with electrical network, with the voltage of detection of grid;
Controller, it is connected with described direct current detection device, DC voltage detecting device and DC boosting unit respectively, described controller receives DC current values and the DC voltage value of direct current detection device and DC voltage detecting device transmission, so that DC boosting unit is carried out to maximal power tracing control; Described controller is also connected with alternating voltage checkout gear, H bridge inversion unit, combining inverter and direct current chopper unit, described controller is according to the operating state of the ac voltage judgement electrical network of alternating voltage checkout gear transmission, to control H bridge inversion unit output AC voltage, line voltage is fallen or surge compensates, described controller is also controlled combining inverter and is injected electric energy to electrical network, and controls direct current chopper unit release electric energy.
2. the feed-forward type voltage based on solar energy power generating as claimed in claim 1 falls surge compensation arrangement, it is characterized in that, described controller comprises digital signal processor.
3. the feed-forward type voltage based on solar energy power generating as claimed in claim 1 falls surge compensation arrangement, it is characterized in that, described controller comprises single-chip microcomputer.
4. the feed-forward type voltage based on solar energy power generating as claimed in claim 1 falls surge compensation arrangement, it is characterized in that, described direct current detection device comprises DC current sensor.
5. the feed-forward type voltage based on solar energy power generating as claimed in claim 1 falls surge compensation arrangement, it is characterized in that, described DC voltage detecting device comprises direct current voltage sensor.
6. the feed-forward type voltage based on solar energy power generating as claimed in claim 1 falls surge compensation arrangement, it is characterized in that, described alternating voltage checkout gear comprises AC voltage sensor.
7. adopt the feed-forward type voltage based on solar energy power generating as claimed in claim 1 to fall surge compensation arrangement and carry out the method that voltage falls surge compensation, it is characterized in that, comprise step:
Adopt solar photovoltaic cell panel to convert solar energy into direct current output;
Adopt DC boosting unit that the direct current of solar-energy photo-voltaic cell output is converted to a galvanic current, and DC boosting unit is carried out to maximal power tracing control so that the direct current active power of DC boosting unit output is maximum;
Adopt H bridge inversion unit and combining inverter to change the direct current of DC boosting unit output into alternating current;
Detection of grid voltage U
swhether normal: if be judged as YES, making controller control H bridge inversion unit is zero to the alternating voltage of electrical network output, and controls whole electric energy injection electrical networks that combining inverter produces solar photovoltaic cell panel; If be judged as NO, further judge that electrical network voltage has occurred and fallen or voltage surge has occurred: if be judged as voltage, fall, control H bridge inversion unit to the alternating voltage U of electrical network output
j=U
s0-U
s, and control the remaining electric energy injection electrical network that combining inverter produces solar photovoltaic cell panel; If be judged as voltage surge, control H bridge inversion unit to the alternating voltage U of electrical network output
j=U
s0-U
s, and control the unnecessary electric energy that direct current chopper unit discharges solar photovoltaic cell panel generation, to maintain the stable of DC bus-bar voltage; U wherein
s0for electrical network standard alternating supply voltage value.
8. method as claimed in claim 7, it is characterized in that, the described step that DC boosting unit is carried out to maximal power tracing control is: controller detects the active power of DC boosting unit output, judge whether the active power of this output is greater than the active power of output last time, if be judged as YES, increase the duty ratio of DC boosting unit, if be judged as NO, the duty ratio that maintains DC boosting unit is constant.
9. method as claimed in claim 8, is characterized in that, adopts respectively direct current detection device and DC voltage detecting device to detect the galvanic electric current I of DC boosting unit output
pvand voltage U
pv, to obtain the active-power P of DC boosting unit output
pv=U
pv* I
pv.
10. method as claimed in claim 7, is characterized in that, works as 90%U
s0≤ U
s≤ 110%U
s0, judge that line voltage Us is for normal; Work as U
s< 90%U
s0, be judged as voltage and fall; Work as U
s> 110%U
s0, be judged as voltage surge.
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|---|---|---|---|
| CN201410300882.3A CN104104085A (en) | 2014-06-27 | 2014-06-27 | Feedforward voltage drop and surge compensation device based on solar photovoltaic power generation, and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410300882.3A CN104104085A (en) | 2014-06-27 | 2014-06-27 | Feedforward voltage drop and surge compensation device based on solar photovoltaic power generation, and method |
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ID=51671998
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| CN201410300882.3A Pending CN104104085A (en) | 2014-06-27 | 2014-06-27 | Feedforward voltage drop and surge compensation device based on solar photovoltaic power generation, and method |
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Application publication date: 20141015 |