CN103346587B - Anti-countercurrent grid-connected photovoltaic power generation system - Google Patents
Anti-countercurrent grid-connected photovoltaic power generation system Download PDFInfo
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- CN103346587B CN103346587B CN201310286813.7A CN201310286813A CN103346587B CN 103346587 B CN103346587 B CN 103346587B CN 201310286813 A CN201310286813 A CN 201310286813A CN 103346587 B CN103346587 B CN 103346587B
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- 238000010248 power generation Methods 0.000 title abstract description 10
- 238000004891 communication Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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 provides an anti-countercurrent grid-connected photovoltaic power generation system and particularly relates to a photovoltaic power generation grid connection technology. The anti-countercurrent grid-connected photovoltaic power generation system can predict a countercurrent phenomenon in advance and avoids the countercurrent phenomenon. The anti-countercurrent grid-connected photovoltaic power generation system comprises at least one inverter and an acquisition control unit connected with each inverter. The acquisition control unit judges whether the countercurrent phenomenon is likely to happen or not according to the power output to a load by a public power grid and the power output to the load by the grid-connected photovoltaic power generation system, wherein the power output to the load by the public power grid and the power output to the load by the grid-connected photovoltaic power generation system are acquired in real time. When the countercurrent phenomenon is judged to be likely to happen, the acquisition control unit controls operation of each inverter, and reduces the power output to the load by the anti-countercurrent grid-connected photovoltaic power generation system until the acquisition control unit determines that the trend toward the countercurrent phenomenon does not exist.
Description
Technical field
The present invention relates to photovoltaic power generation grid-connecting technology, particularly relate to a kind of counterflow-preventing grid-connected photovoltaic system.
Background technology
In order to realize the sustainable development of the energy and environment, countries in the world are all by the development priority of solar energy power generating as new forms of energy and regenerative resource.Current photovoltaic power generation grid-connecting system can be divided into reversible flow with can not adverse current two kinds of grid-connected photovoltaic systems.Irreversible streaming system refers to that the energy output of photovoltaic parallel in system is less than or equal to the power consumption of load all the time, and by mains supply when electricity is not enough, namely grid-connected photovoltaic system and electrical network form duplicate supply and power to the load.Even if create dump energy for a certain reason, also can only be processed by technological means or be abandoned, owing to there will not be photovoltaic parallel in system to the situation of grid power transmission, be referred to as irreversible streaming system.
For guaranteeing the safety and stability of public electric wire net, grid-connected photovoltaic system most requirement is without contracurrent system.There will not be adverse current to fall power transmission in order to ensure grid-connected photovoltaic system and enter public electric wire net, grid-connected photovoltaic system must have counterflow-preventing function.
Direction and the size of the voltage of increase collecting device collection and detection grid-connected photovoltaic system, electric current and power is passed through in prior art; and judge whether to occur backflow phenomena to these data analyses by reverse-power relay; then export control signal and carry out power adjustments to controlling synchronization AC side; realize reverse current protection; this protected mode only just can send control signal when there is backflow phenomena and carry out reverse current protection; and the appearance of anticipation backflow phenomena can not be shifted to an earlier date, thus the generation of backflow phenomena can not be avoided completely.
Summary of the invention
Embodiments of the invention provide a kind of counterflow-preventing grid-connected photovoltaic system, can the appearance of look-ahead backflow phenomena, thus completely avoid the generation of backflow phenomena.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of counterflow-preventing grid-connected photovoltaic system, comprises at least one inverter, and the collection control unit be connected with each described inverter;
The power that the public electric wire net that described collection control unit obtains according to Real-time Collection exports to load, and the power that described grid-connected photovoltaic system exports to load, judge whether the trend that backflow phenomena occurs;
When judging the trend that flow phenomenon occurs, described collection control unit controls the work of described inverter, reduce the power that described counterflow-preventing grid-connected photovoltaic system exports to described load, until described control collecting unit judges the trend not having backflow phenomena to occur.
Optionally, predetermined power is provided with in described collection control unit, the power reduction that the described public electric wire net obtained when described collection control unit collection exports to load is to predetermined power, and described grid-connected photovoltaic system is when increasing gradually to the power that load exports, described collection control unit sends derate output order at least one inverter in described counterflow-preventing grid-connected photovoltaic system, the amount that the power reduction that described first inverter is exported to described load is certain, until the described public electric wire net that obtains of described control collecting unit collection is increased to more than described predetermined power to the power of load, and described grid-connected photovoltaic system no longer increases to the power of load,
Wherein, described predetermined power can be determined according to public electric wire net and grid-connected real output, and this predetermined power can be arranged to be greater than the arbitrary value between maximum power that 0 to public electric wire net exports to load in theory.Described predetermined power can integrally be arranged in described collection control unit; Optionally, described collection control unit has the interface regulating described predetermined power, thus can arrange described predetermined power according to specific circumstances.
Optionally, described counterflow-preventing grid-connected photovoltaic system comprises multiple inverter; If the power reduction to 0 that at least one inverter described exports to described load, and the described public electric wire net that described collection control unit collection obtains still is no more than described predetermined power to the power that load exports, when described grid-connected photovoltaic system still increases to the power that load exports;
Described collection control unit sends halt instruction at least one inverter described, at least one inverter described is shut down, at least one inverter in the inverter of simultaneously not shutting down in described counterflow-preventing grid-connected photovoltaic system sends derate output order, the amount that the power reduction that at least one inverter in the inverter of not shutting down described in making exports to described load is certain, until the described public electric wire net that obtains of described control collecting unit collection is increased to more than described predetermined power to the power of load, and the power that described grid-connected photovoltaic system exports to load no longer increases.
Optionally; when described collection control unit also increases to the power sum that load exports for the power that exports to load at described public electric wire net and described grid-connected photovoltaic system; inverter to described shutdown sends start-up command; the inverter exported to derate sends increment output order; the inverter of described shutdown is started shooting, and the inverter that described derate is exported increases certain amount to the power that described load exports.
Optionally, described collection control unit is the hardware platform based on Digital Signal Processing Digital Signal Processing (Digital Signal Processing, DSP) microprocessor; Then,
Described collection control unit is connected with each described inverter by serial communication interface or Ethernet interface, thus the power that each inverter of Real-time Collection exports to load, and then obtains the power that described grid-connected photovoltaic system exports to load;
Described collection control unit is connected with the low-voltage distribution side multifunction electric meter of described public electric wire net by serial communication interface or Ethernet interface, and then Real-time Collection obtains the power that described public electric wire net exports to load.
Optionally, telecommunication cable is adopted to be connected between described collection control unit with each described inverter; Telecommunication cable is adopted to be connected between described collection control unit and the low-voltage distribution side multifunction electric meter of described public electric wire net.
A kind of counterflow-preventing grid-connected photovoltaic system that the embodiment of the present invention provides, the power that described collection control unit exports to load according to Real-time Collection acquisition public electric wire net, and the power that described grid-connected photovoltaic system exports to load, judge whether the trend that backflow phenomena occurs; And when judging the trend that flow phenomenon occurs, control the work of described inverter, reduce the power that described counterflow-preventing grid-connected photovoltaic system exports to described load, until described control collecting unit judges the trend not having backflow phenomena to occur.Described like this collection control unit just can before backflow phenomena occurs, and the work controlling described inverter prevents the generation of backflow phenomena, so just can the appearance of look-ahead backflow phenomena, thus completely avoid the generation of backflow phenomena.
Accompanying drawing explanation
A kind of counterflow-preventing grid-connected photovoltaic system that Fig. 1 provides for the embodiment of the present invention and the structural representation that public electric wire net generates electricity by way of merging two or more grid systems.
Accompanying drawing explanation
1-counterflow-preventing grid-connected photovoltaic system, 2-public electric wire net, 3-load; 11-inverter, 12-gathers control unit, 21-multifunction electric meter.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
Embodiments provide a kind of counterflow-preventing grid-connected photovoltaic system, as shown in Figure 1, described counterflow-preventing grid-connected photovoltaic system 1 comprises at least one inverter 11, and the collection control unit 12 be connected with each described inverter 11.
The power that the public electric wire net 2 that described collection control unit 12 obtains according to Real-time Collection exports to load 3, and the power that described grid-connected photovoltaic system 1 exports to load 3, judge whether the trend that backflow phenomena occurs; When judging the trend that flow phenomenon occurs, described collection control unit 12 controls the work of described inverter 11, reduce the power that described counterflow-preventing grid-connected photovoltaic system 1 exports to described load, until described control collecting unit judges the trend not having backflow phenomena to occur.
Described collection control unit 12 can distinguish the power that Real-time Collection public electric wire net 2 exports to load 3, and the power that described grid-connected photovoltaic system 1 exports to load 3; Then the power that the public electric wire net obtained according to described Real-time Collection exports to load, and the change of power that described grid-connected photovoltaic system exports to load, look-ahead goes out the appearance of backflow phenomena, then by controlling the work of described inverter, reduce the power that described counterflow-preventing grid-connected photovoltaic system exports to described load, thus completely avoid the generation of backflow phenomena.
Optionally, predetermined power can be provided with in described collection control unit 12, the power reduction exported to load 3 when described public electric wire net 2 is to predetermined power, and described grid-connected photovoltaic system 1 is when increasing gradually to the power that load 3 exports, described collection control unit 12 can judge the trend that flow phenomenon occurs, now described collection control unit 12 just can send derate output order at least one inverter in described counterflow-preventing grid-connected photovoltaic system 1, the amount that the power reduction that at least one inverter described in making exports to described load is certain, until the described public electric wire net that described collection control unit collection obtains is increased to more than described predetermined power to the power that load exports, and the power that described grid-connected photovoltaic system exports to load no longer increases, namely until described control collecting unit judges the trend not having backflow phenomena to occur.
Wherein, described predetermined power can be determined according to public electric wire net and grid-connected real output, and this predetermined power can be arranged to be greater than the arbitrary value between maximum power that 0 to public electric wire net exports to load in theory.Described predetermined power can integrally be arranged in described collection control unit; Optionally, described collection control unit has the interface regulating described predetermined power, thus can arrange described predetermined power according to specific circumstances.
In embodiments of the present invention, the power that described public electric wire net 2 exports to described load 3 and described grid-connected photovoltaic system 1 are exactly the electric power sum of the load of user side to the power sum that load 3 exports, the power exported to described load 3 when described public electric wire net 2 reduces gradually, when described grid-connected photovoltaic system 1 increases gradually to the power that load 3 exports, illustrate that grid-connected photovoltaic system 1 occupies dominating into load 3 power supply gradually.When the power reduction to 0 that described public electric wire net 2 exports to described load 3, illustrate that described grid-connected photovoltaic system 1 substitutes described public electric wire net 2 completely and powers for described load 3.When the power reduction that described public electric wire net 2 exports to described load 3 is to negative value, illustrate that described grid-connected photovoltaic system 1 not only substitutes described public electric wire net 2 completely and powers for described load 3, and generation has dump energy, occurs the backflow phenomena that described grid-connected photovoltaic system 1 is transmitted electricity to described public electric wire net 2.
From the above, described collection control unit 12 can pre-set a predetermined power, and but described predetermined power trends towards 0 is greater than 0, and its concrete value can be determined according to actual conditions.The power reduction that the described public electric wire net 2 obtained when the collection of described collection control unit 12 exports to load is to predetermined power, and described grid-connected photovoltaic system 1 is when increasing gradually to the power of load, will backflow phenomena be there is in explanation, now, described collection control unit 12 will send derate output order at least one inverter in counterflow-preventing grid-connected photovoltaic system, the amount that the power reduction that at least one inverter described in making exports to described load is certain, has so just contained the power that described grid-connected photovoltaic system 1 exports to described load.Simultaneously, described collection control unit 12 goes back the power that Real-time Collection acquisition public electric wire net 2 exports to load, and the power that described grid-connected photovoltaic system 1 exports to load, if the power that described public electric wire net 2 exports to load 3 is no more than described predetermined power, when described grid-connected photovoltaic system 1 still increases to the power that load 3 exports, described collection control unit 12 will continue at least one inverter described in counterflow-preventing grid-connected photovoltaic system 1 and send derate output order, contain the power that described grid-connected photovoltaic system 1 exports to described load.Until the described public electric wire net that the collection of described control collecting unit 12 obtains is increased to more than described predetermined power to the power that load exports, and described grid-connected photovoltaic system no longer increases, namely until no longer include the trend of generation backflow phenomena to the power of load.
Here it should be noted that, when described collection control unit 12 predict will there is backflow phenomena time, described collection control unit 12 can send derate output order to the inverter of in described grid-connected photovoltaic system, also derate output order can be sent to the multiple inverter in described grid-connected photovoltaic system or even whole inverter, the amount that the power reduction that at least one inverter described in making exports to described load is certain.Here, the amount of reduction can be carried in described derate output order and send to inverter; Also can be set in advance in described inverter, after described inverter receives described derate output order, the amount that the power reduction that inverter will be made to export to described load is certain.The numerical value of the amount that described reduction is certain can be arbitrary value, such as, can be 1/3 of the power of the current generation of this inverter, also can be a fixing numerical value 100W etc.
Optionally, if at least one inverter described is the one or more inverters in described photovoltaic grid-connected system, instead of during whole inverter, when the power reduction to 0 that at least one inverter described exports to described load 3, following situation may be there is: the power that the described public electric wire net 2 that the collection of described collection control unit 12 obtains exports to load 3 is still no more than described predetermined power, the power that described grid-connected photovoltaic system 1 exports to load 3 still increases, namely still there is the trend that backflow phenomena occurs, now, described collection control unit 12 can send halt instruction at least one inverter described, described first inverter is shut down, at least one inverter in the inverter of simultaneously not shutting down in described counterflow-preventing grid-connected photovoltaic system sends derate output order, the amount that the power reduction that at least one inverter in the inverter of not shutting down described in making exports to described load 3 is certain, until the power that the described public electric wire net 2 that the collection of described control collecting unit 12 obtains exports to load 3 is increased to more than described predetermined power, and the power that described grid-connected photovoltaic system 1 exports to load 3 no longer increases.
In sum, described collection control unit 12 predict to there is backflow phenomena time, can select to send derate output order to any one or more inverter, and judge whether contained the generation of backflow phenomena after described any one or more inverter derate power output, if do not contained, then continue to allow described any one or more inverter derate export, if until when described any one or more inverter is all reduced to 0 to the power that described load exports, backflow phenomena is not contained yet, then described collection control unit 12 can make it shut down to described any one or more inverter transmission halt instruction, the any one or more inverters simultaneously continued in the inverter of not shutting down in described counterflow-preventing grid-connected photovoltaic system send derate output order, until described control collecting unit 12 is judged to no longer include the trend that backflow phenomena occurs.
When described collection control unit 12 also increases to the power sum that load 3 exports for the power that exports to load 3 at described public electric wire net 2 and described grid-connected photovoltaic system 1; namely when the power consumption of load 3 increases; inverter to described shutdown sends start-up command; the inverter exported to derate sends increment output order; the inverter of described shutdown is started shooting, and the inverter that described derate is exported increases certain amount to the power that described load exports.The amount wherein increased can be carried in described increment output order and send to inverter; Also can be set in advance in described inverter, after described inverter receives described increment output order, inverter will be made to increase certain amount to the power that described load exports.The amount of described increase can be arbitrary value, and the amount such as increased can be a fixing numerical value 100W, and the amount of described increase also can make this inverter be increased to the quota etc. of the power that described inverter can export to the power that described load exports.
Like this, when backflow phenomena will be there is, reduce the power of described grid-connected photovoltaic system to load, there is not backflow phenomena, and during the increase of the power consumption of load, increase the power of described grid-connected photovoltaic system to load, the energy output of grid-connected photovoltaic system and the intelligent balance of load power consumption can be realized, and the auto restore facility of grid-connected photovoltaic system, make grid-connected photovoltaic system have optimum service efficiency and running time.
Optionally, in embodiments of the present invention, described collection control unit 12 can be the hardware platform based on DSP microprocessor; Therefore described collection control unit just externally can be connected by serial communication interface or Ethernet interface.
Then, described collection control unit 12 can be connected with each described inverter by serial communication interface or Ethernet interface, thus the power that each inverter of Real-time Collection exports to load, and then obtain the power that described grid-connected photovoltaic system exports to load.Described grid-connected photovoltaic system to the power that load exports be exactly in described grid-connected photovoltaic system all inverters to the power sum of load.
Described collection control unit 12 also can be connected with the low-voltage distribution side multifunction electric meter of described public electric wire net by serial communication interface or Ethernet interface, and then Real-time Collection obtains the power that described public electric wire net exports to load.
Preferably, telecommunication cable is adopted to be connected between described collection control unit 12 with each described inverter 11; Also telecommunication cable is adopted to be connected between described collection control unit 12 and the low-voltage distribution side multifunction electric meter 21 of described public electric wire net 2.
Need to increase collecting device with PLC of the prior art and transmitter adopts analog acquisition cable image data, adopt control signal cable to transmit control signal to compare to control system, gathering control unit described in the present invention can adopt telecommunication cable to realize data acquisition and power adjustments, wiring is easy, and structure is also simple.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (3)
1. a counterflow-preventing grid-connected photovoltaic system, comprises at least one inverter, it is characterized in that, also comprise: the collection control unit be connected with each described inverter;
The power that the public electric wire net that described collection control unit obtains according to Real-time Collection exports to load, and the power that described grid-connected photovoltaic system exports to load, judge whether the trend that backflow phenomena occurs;
When judging the trend that backflow phenomena occurs, described collection control unit controls the work of described inverter, reduce the power that described counterflow-preventing grid-connected photovoltaic system exports to described load, until described control collecting unit judges the trend not having backflow phenomena to occur;
Wherein, described collection control unit is the hardware platform based on Digital Signal Processing DSP microprocessor;
Described collection control unit is connected with each described inverter by serial communication interface or Ethernet interface, thus the power that each inverter of Real-time Collection exports to load, and then obtains the power that described grid-connected photovoltaic system exports to load;
Described collection control unit is connected with the low-voltage distribution side multifunction electric meter of described public electric wire net by serial communication interface or Ethernet interface, and then Real-time Collection obtains the power that described public electric wire net exports to load;
Predetermined power is provided with in described collection control unit, the power reduction that the described public electric wire net obtained when described collection control unit collection exports to load is to predetermined power, and described grid-connected photovoltaic system is when increasing gradually to the power that load exports, described collection control unit sends derate output order at least one inverter in described counterflow-preventing grid-connected photovoltaic system, the amount that the power reduction that at least one inverter described in making exports to described load is certain, until the described public electric wire net that described control collecting unit collection obtains is increased to more than described predetermined power to the power that load exports, and the power that described grid-connected photovoltaic system exports to load no longer increases,
Described counterflow-preventing grid-connected photovoltaic system comprises multiple inverter;
If the power reduction to 0 that at least one inverter described exports to described load, and the described public electric wire net that described collection control unit collection obtains still is no more than described predetermined power to the power that load exports, when described grid-connected photovoltaic system still increases to the power that load exports;
Described collection control unit sends halt instruction at least one inverter described, at least one inverter described is shut down, at least one inverter in the inverter of simultaneously not shutting down in described counterflow-preventing grid-connected photovoltaic system sends derate output order, the amount that the power reduction that at least one inverter in the inverter of not shutting down described in making exports to described load is certain, until the described public electric wire net that described control collecting unit collection obtains is increased to more than described predetermined power to the power that load exports, and the power that described grid-connected photovoltaic system exports to load no longer increases.
2. counterflow-preventing grid-connected photovoltaic system according to claim 1; it is characterized in that; when described collection control unit also increases to the power sum that load exports for the power that exports to load at described public electric wire net and described grid-connected photovoltaic system; inverter to described shutdown sends start-up command; the inverter exported to derate sends increment output order; the inverter of described shutdown is started shooting, and the inverter that described derate is exported increases certain amount to the power that described load exports.
3. counterflow-preventing grid-connected photovoltaic system according to claim 1, is characterized in that,
Telecommunication cable is adopted to be connected between described collection control unit with each described inverter;
Telecommunication cable is adopted to be connected between described collection control unit and the low-voltage distribution side multifunction electric meter of described public electric wire net.
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| CN201310286813.7A CN103346587B (en) | 2013-07-09 | 2013-07-09 | Anti-countercurrent grid-connected photovoltaic power generation system |
| PCT/CN2013/086634 WO2015003443A1 (en) | 2013-07-09 | 2013-11-06 | Anti-countercurrent grid-connected photovoltaic power generation system |
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| CN201310286813.7A CN103346587B (en) | 2013-07-09 | 2013-07-09 | Anti-countercurrent grid-connected photovoltaic power generation system |
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| CN103346587A CN103346587A (en) | 2013-10-09 |
| CN103346587B true CN103346587B (en) | 2015-06-03 |
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| CN103346587B (en) * | 2013-07-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN104300896B (en) * | 2014-11-18 | 2015-12-30 | 厦门科华恒盛股份有限公司 | Photovoltaic DC-to-AC converter control device with counterflow-preventing and control method thereof |
| CN104796077A (en) * | 2015-04-27 | 2015-07-22 | 浙江昱能科技有限公司 | Anti-countercurrent distributed solar photovoltaic system and countercurrent prevention method |
| CN107069798B (en) * | 2017-01-17 | 2023-05-09 | 陕西科技大学 | Control method and system for distributed photovoltaic power generation system |
| CN109510188B (en) * | 2018-12-12 | 2022-10-21 | 国网河南省电力公司济源供电公司 | Control method of distributed photovoltaic power generation reverse power transmission device |
| CN109768576B (en) * | 2019-02-26 | 2021-04-02 | 廊坊新奥泛能网络科技服务有限公司 | Universal energy station and reverse power protection method and device thereof |
| CN111008909A (en) * | 2019-11-19 | 2020-04-14 | 远景智能国际私人投资有限公司 | Anti-reflux protection method, device, equipment and storage medium of energy storage system |
| CN112270073A (en) * | 2020-10-09 | 2021-01-26 | 合肥阳光新能源科技有限公司 | Countercurrent early warning method and device and computer storage medium |
| CN114374230A (en) * | 2021-11-10 | 2022-04-19 | 温州电力建设有限公司 | Collaborative optimization system of wind-solar energy storage micro-grid |
| CN114362249B (en) * | 2022-01-27 | 2024-03-26 | 阳光慧碳科技有限公司 | Source load system countercurrent prevention control method and device and source load system |
| CN116896114B (en) * | 2023-09-11 | 2024-02-06 | 深圳市首航新能源股份有限公司 | Control method based on grid-connected system and grid-connected system |
| CN116979527A (en) * | 2023-09-21 | 2023-10-31 | 合肥国轩高科动力能源有限公司 | Micro-grid control method and device, nonvolatile storage medium and electronic equipment |
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| CN103166243A (en) * | 2011-12-19 | 2013-06-19 | 阳光电源股份有限公司 | Countercurrent-resisting control method and device and countercurrent-resisting system thereof |
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| DE102010060398A1 (en) * | 2010-11-08 | 2012-05-10 | Adensis Gmbh | Method for operating a photovoltaic system for feeding electrical power into a medium-voltage network |
| CN202772654U (en) * | 2012-05-28 | 2013-03-06 | 湖北工业大学 | Controller for photovoltaic power generation and municipal power grid concurrent complementary application |
| CN103346587B (en) * | 2013-07-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
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| CN103138282A (en) * | 2011-11-24 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN103166243A (en) * | 2011-12-19 | 2013-06-19 | 阳光电源股份有限公司 | Countercurrent-resisting control method and device and countercurrent-resisting system thereof |
| CN202513587U (en) * | 2012-03-02 | 2012-10-31 | 阳光电源股份有限公司 | Grid-connected inverter power supply and countercurrent prevention system |
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