CN102832637B - Reverse current preventing method for photovoltaic power station - Google Patents
Reverse current preventing method for photovoltaic power station Download PDFInfo
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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
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- 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
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Abstract
The invention relates to a reverse current preventing method for a photovoltaic power station. According to the method, a power detection device is added at the position of a load, power of the load is uploaded to a monitoring system, an active power scheduling value of each inverter in the power station is computed by the aid of the power value according to a certain algorithm in the monitoring system, and output of each inverter is guaranteed not to exceed the limiting value, so that output of a photovoltaic power source is guaranteed to be smaller than or equal to the power of the load, reverse current of the photovoltaic power station can be avoided, implementation complexity of an existing common method is overcome, and the shortcoming of electric energy production loss is avoided. The reverse current preventing method for the photovoltaic power station is simple to implement by the aid of an existing system structure and is capable of completely avoiding the reverse current of the photovoltaic power station.
Description
Technical field
The invention belongs to photovoltaic reverse power Control protection technical field, relate to a kind of photovoltaic plant counterflow-preventing method.
Background technology
Along with country increases gradually to the supporting dynamics of new forms of energy especially photovoltaic plant, domestic pv grid-connected plant gets more and more.This wherein has a big chunk to be directly connected on user side power distribution network, and photovoltaic plant electricity directly supplies user's lateral load and uses.But when user's lateral load reduces, photovoltaic plant electricity just may recharge into power distribution network, thus the safety of power distribution network, reliability service are impacted.State Grid Corporation of China's requirement, when photovoltaic generating system is designed to irreversible synchronizing mode, when detecting that backward current exceedes 5% of specified output, photovoltaic generating system should stop to power network line power transmission in 0.5s ~ 2s.
The counterflow-preventing guard method that present photovoltaic plant is commonly used as shown in Figure 1.The electric current of anti-backflow device Real-Time Monitoring distribution transformer side, when backward current having been detected, has then disconnected the connection of photo-voltaic power supply and electrical network, or by certain algorithm, makes photovoltaic DC-to-AC converter reduce power output.After backward current disappears, the time delay regular hour, reconnect photo-voltaic power supply and electrical network, or by certain algorithm, increase the power output of photovoltaic DC-to-AC converter step by step.
Adopt in this way, be carry out passive protection after adverse current occurs, instead of carry out prevention initiatively before adverse current occurs.Which needs configuration counterflow-preventing checkout gear, if detect, namely upstream signal disconnects the connection of photo-voltaic power supply and electrical network, then can cause the loss of photovoltaic DC-to-AC converter energy output; According to the mode reducing power output, then need anti-backflow device to be connected by communication interface with every platform inverter, realize complicated, and the control of power output need be realized by the algorithm of complexity.
Summary of the invention
The object of this invention is to provide a kind of photovoltaic plant counterflow-preventing method, is the problem brought of carrying out passive protection after adverse current occurs to solve existing counterflow-preventing method.
For achieving the above object, photovoltaic plant counterflow-preventing method step of the present invention is as follows:
(1) increase loaded power detection device in load place of photovoltaic plant counterflow-preventing protection system, and this power detection device is connected with the communication of photo-voltaic power supply supervisory control system;
(2) power detection device detects bearing power in real time, and the detected value of this bearing power is uploaded to photo-voltaic power supply supervisory control system;
(3) photo-voltaic power supply supervisory control system is according to the quantity of photovoltaic combining inverter in power station, capacity and bearing power, calculates the active power higher limit of every platform photovoltaic combining inverter;
(4) if the current peak power output of inverter is no more than active power higher limit, then inverter is with its maximum output power output; If the current peak power output of inverter exceedes active power higher limit, then by active power higher limit power output, also namely run on active power dispatch state, prevent photovoltaic plant from causing adverse current to power distribution network.
Further, in described step (3), the account form of the active power upper limit is:
P
limit---every platform inverter active power higher limit
P
total---photovoltaic plant joins inverter total capacity
P
n---the rated capacity of every platform inverter
P---real time load power
Photovoltaic plant counterflow-preventing method of the present invention, power detection device is increased at load place, load power is uploaded to supervisory control system, in supervisory control system, by this performance number according to certain algorithm, as the active power dispatch value of platform inverter every in power station, guarantee that every platform inverter exports and can not exceed this limit value, thus ensure that the output of photo-voltaic power supply is less than or equal to load power, photovoltaic plant does not have the generation of adverse current, overcoming existing common method realizes complicated, and the shortcoming that energy output loses can be caused, the present invention utilizes existing system structure, realize simple, and the generation of photovoltaic plant adverse current can be avoided completely.
Accompanying drawing explanation
Fig. 1 is existing photovoltaic plant counterflow-preventing protection philosophy figure;
Fig. 2 is the photovoltaic plant counterflow-preventing protection philosophy figure of the embodiment of the present invention.
Embodiment
Existing photovoltaic plant all has supervisory control system; and photovoltaic combining inverter has the function of active power scheduling; inverter can according to the dispatch command of supervisory control system; limit its active power to export; reasonably utilize this function, the protection of photovoltaic plant counterflow-preventing can be realized very easily, guarantee that not having adverse current occurs; and the power match of photo-voltaic power supply and load can be realized, thus the energy output of photo-voltaic power supply can not be lost.
Photovoltaic plant counterflow-preventing guard method principle as shown in Figure 2.First add bearing power checkout gear in load place, this power detection device needs bearing power to upload to photo-voltaic power supply supervisory control system in real time by communication, does not need additionally to increase counterflow-preventing checkout gear.According to the bearing power uploaded in photo-voltaic power supply supervisory control system, and the quantity of photovoltaic DC-to-AC converter and the capacity of every platform in power station, according to the following formula:
P
limit---every platform inverter active power higher limit
P
total---photovoltaic plant joins inverter total capacity
P
n---the rated capacity of every platform inverter
P---real time load power
Can calculate the active power upper limit of every platform photovoltaic combining inverter, this upper limit is as the active power dispatch value of every platform inverter.
If the current peak power output of inverter is no more than active power higher limit, then inverter is with its maximum output power output; If the current peak power output of inverter exceedes active power higher limit, then by active power higher limit power output, also namely run on active power dispatch state.This patent is subsidized by national high-tech research development yearly plan (863 Program) problem, project number: 2012AA050206.
Claims (1)
1. a photovoltaic plant counterflow-preventing method, the step of the method is as follows:
(1) increase loaded power detection device in load place of photovoltaic plant counterflow-preventing protection system, and this power detection device is connected with the communication of photo-voltaic power supply supervisory control system;
(2) power detection device detects bearing power in real time, and the detected value of this bearing power is uploaded to photo-voltaic power supply supervisory control system;
(3) photo-voltaic power supply supervisory control system is according to the quantity of photovoltaic combining inverter in power station, capacity and bearing power, calculates the active power dispatch value of active power higher limit as corresponding inverter of every platform photovoltaic combining inverter; The account form of the active power higher limit of every platform photovoltaic combining inverter is as follows:
Wherein, P
limit---every platform inverter active power higher limit,
P
total---photovoltaic plant joins inverter total capacity,
P
n---the rated capacity of every platform inverter,
P---real time load power;
(4) if the current peak power output of inverter is no more than active power higher limit, then inverter is with its maximum output power output; If the current peak power output of inverter exceedes active power higher limit, then by active power higher limit power output, also namely run on active power dispatch state, prevent photovoltaic plant from causing adverse current to power distribution network.
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| CN201210303025.XA CN102832637B (en) | 2012-08-23 | 2012-08-23 | Reverse current preventing method for photovoltaic power station |
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| CN201210303025.XA CN102832637B (en) | 2012-08-23 | 2012-08-23 | Reverse current preventing method for photovoltaic power station |
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| CN102832637B true CN102832637B (en) | 2015-01-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475028B (en) * | 2013-09-24 | 2016-10-05 | 许继电气股份有限公司 | Brake feedback device is to the counterflow-preventing control system of electric power system and control method |
| CN107947230B (en) * | 2017-12-01 | 2019-11-29 | 阳光电源股份有限公司 | A kind of Countercurrent prevention control method of photovoltaic generating system, apparatus and system |
| CN113708411A (en) * | 2021-09-26 | 2021-11-26 | 阳光电源股份有限公司 | Comprehensive energy system and countercurrent control method thereof |
| CN114825471B (en) * | 2022-06-28 | 2022-09-27 | 长沙矿冶研究院有限责任公司 | Automatic coordination control method and system for optical storage charging and discharging micro-grid system |
| CN115224742B (en) * | 2022-09-21 | 2022-12-20 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| CN102097817A (en) * | 2010-01-06 | 2011-06-15 | 珠海兴业新能源科技有限公司 | Photovoltaic reverse power controller |
| CN202309098U (en) * | 2011-07-01 | 2012-07-04 | 中国电子科技集团公司第三十六研究所 | Communication monitor module of photovoltaic generating grid-connected inverter system |
| CN202353230U (en) * | 2011-10-09 | 2012-07-25 | 天津永明新能源科技有限公司 | Photovoltaic power supply system anti-reverse power device based on single-chip microcomputer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097817A (en) * | 2010-01-06 | 2011-06-15 | 珠海兴业新能源科技有限公司 | Photovoltaic reverse power controller |
| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| CN202309098U (en) * | 2011-07-01 | 2012-07-04 | 中国电子科技集团公司第三十六研究所 | Communication monitor module of photovoltaic generating grid-connected inverter system |
| CN202353230U (en) * | 2011-10-09 | 2012-07-25 | 天津永明新能源科技有限公司 | Photovoltaic power supply system anti-reverse power device based on single-chip microcomputer |
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