CN102832637A - Reverse current preventing method for photovoltaic power station - Google Patents
Reverse current preventing method for photovoltaic power station Download PDFInfo
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- CN102832637A CN102832637A CN201210303025XA CN201210303025A CN102832637A CN 102832637 A CN102832637 A CN 102832637A CN 201210303025X A CN201210303025X A CN 201210303025XA CN 201210303025 A CN201210303025 A CN 201210303025A CN 102832637 A CN102832637 A CN 102832637A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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 inverse probability control resist technology field, relate to the anti-adverse current method of a kind of photovoltaic plant.
Background technology
Along with country increases the supporting dynamics of new forms of energy especially photovoltaic plant gradually, domestic pv grid-connected plant is more and more.This wherein has a big chunk directly to be connected on the user side power distribution network, and the photovoltaic plant electricity is directly supplied with the user side load and used.But when the user side load reduced, the photovoltaic plant electricity just possibly recharge into power distribution network, thereby safety, the reliability service of power distribution network impacted.State Grid Corporation of China's requirement, photovoltaic generating system are designed to irreversible and during net mode, when detect backward current surpass specified output 5% the time, photovoltaic generating system should stop to send to power network line in 0.5s ~ 2s.
The anti-reverse current protection method that photovoltaic plant is commonly used now is as shown in Figure 1.Anti-backflow device is monitored the electric current of distribution transformer side in real time, when having detected backward current, then breaks off being connected of photo-voltaic power supply and electrical network, perhaps through certain algorithm, makes photovoltaic DC-to-AC converter reduce power output.After backward current disappears, the time-delay regular hour, connect photo-voltaic power supply and electrical network again, perhaps through certain algorithm, increase the power output of photovoltaic DC-to-AC converter step by step.
Adopt this method, be after adverse current takes place, to carry out passive protection, rather than before adverse current takes place, carry out prevention initiatively.This mode need dispose anti-adverse current checkout gear, promptly breaks off being connected of photo-voltaic power supply and electrical network if detect the adverse current signal, then can cause the loss of photovoltaic DC-to-AC converter energy output; If adopt the mode that reduces power output, then need anti-backflow device is linked to each other through communication interface with every inverter, realization is complicated, and needs to realize through complicated algorithm the control of power output.
Summary of the invention
The purpose of this invention is to provide the anti-adverse current method of a kind of photovoltaic plant, is the problem of being brought of after adverse current takes place, carrying out passive protection to solve existing anti-adverse current method.
For realizing above-mentioned purpose, the anti-adverse current method step of photovoltaic plant of the present invention is following:
(1) prevent that at photovoltaic plant load place of reverse current protection system increases the power detection device of load, 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 the photo-voltaic power supply supervisory control system;
(3) the photo-voltaic power supply supervisory control system calculates the active power higher limit of every photovoltaic combining inverter according to quantity, capacity and the bearing power of photovoltaic combining inverter in the power station;
(4) if the current peak power output of inverter is no more than the active power higher limit, then inverter is with its EIAJ power output; If the current peak power output of inverter surpasses the active power higher limit, then, also promptly run on the active power dispatch state by active power higher limit power output, prevent that photovoltaic plant from causing adverse current to power distribution network.
Further, the account form of the active power upper limit is in the said step (3):
Wherein, P
Limit---every inverter active power higher limit,
P
Total---photovoltaic plant is joined the inverter total capacity,
P
n---the rated capacity of every inverter,
P---real-time bearing power.
Photovoltaic plant of the present invention is prevented the adverse current method, increases power detection device at the load place, and load power is uploaded to supervisory control system; In supervisory control system, use this performance number according to certain algorithm, as the active power scheduling value of every inverter in the power station; Guarantee that the output of every inverter can not surpass this limit value, thus the output that has guaranteed photo-voltaic power supply smaller or equal to load power, photovoltaic plant does not have the generation of adverse current; Overcome existing common method and realized complicacy, and can cause the shortcoming of energy output loss, the present invention utilizes the existing system structure; Realize simply, and can avoid the generation of photovoltaic plant adverse current fully.
Description of drawings
Fig. 1 is the anti-reverse current protection schematic diagram of existing photovoltaic plant;
Fig. 2 is the anti-reverse current protection schematic diagram of the photovoltaic plant of the embodiment of the invention.
Embodiment
Existing photovoltaic plant all has supervisory control system, and photovoltaic combining inverter has the function of active power scheduling, and inverter can be according to the dispatch command of supervisory control system; Limit its active power output; Reasonably utilize this function, can realize very easily that photovoltaic plant prevents reverse current protection, guarantee not have adverse current and take place; And can realize the power match of photo-voltaic power supply and load, thereby can not lose the energy output of photo-voltaic power supply.
The anti-reverse current protection method principle of photovoltaic plant is as shown in Figure 2.At first increased the bearing power checkout gear in load place, this power detection device need upload to the photo-voltaic power supply supervisory control system through communication in real time with bearing power, does not need extra increase to prevent the adverse current checkout gear.In the photo-voltaic power supply supervisory control system according to the bearing power uploaded, and the quantity of photovoltaic DC-to-AC converter and every capacity in the power station, according to following formula:
Wherein, P
Limit---every inverter active power higher limit,
P
Total---photovoltaic plant is joined the inverter total capacity,
P
n---the rated capacity of every inverter,
P---real-time bearing power,
Can calculate the active power upper limit of every photovoltaic combining inverter, this upper limit is as the active power scheduling value of every inverter.
If the current peak power output of inverter is no more than the active power higher limit, then inverter is with its EIAJ power output; If the current peak power output of inverter surpasses the active power higher limit, then, also promptly run on the active power dispatch state by active power higher limit power output.
Claims (2)
1. a photovoltaic plant is prevented the adverse current method, and the step of this method is following:
(1) prevent that at photovoltaic plant load place of reverse current protection system increases the power detection device of load, 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 the photo-voltaic power supply supervisory control system;
(3) the photo-voltaic power supply supervisory control system calculates the active power higher limit of every photovoltaic combining inverter according to quantity, capacity and the bearing power of photovoltaic combining inverter in the power station;
(4) if the current peak power output of inverter is no more than the active power higher limit, then inverter is with its EIAJ power output; If the current peak power output of inverter surpasses the active power higher limit, then, also promptly run on the active power dispatch state by active power higher limit power output, prevent that photovoltaic plant from causing adverse current to power distribution network.
2. method according to claim 1 is characterized in that: the account form of the active power upper limit of every photovoltaic combining inverter is following in the said step (3):
Wherein, P
Limit---every inverter active power higher limit,
P
Total---photovoltaic plant is joined the inverter total capacity,
P
n---the rated capacity of every inverter,
P---real-time bearing power.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475028A (en) * | 2013-09-24 | 2013-12-25 | 许继集团有限公司 | Brake feedback device control system and method for counter current resistance of power supply system |
| CN107947230A (en) * | 2017-12-01 | 2018-04-20 | 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 |
| CN114825471A (en) * | 2022-06-28 | 2022-07-29 | 长沙矿冶研究院有限责任公司 | Automatic coordination control method and system for light storage charging and discharging micro-grid system |
| CN115224742A (en) * | 2022-09-21 | 2022-10-21 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
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| 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475028A (en) * | 2013-09-24 | 2013-12-25 | 许继集团有限公司 | Brake feedback device control system and method for counter current resistance of power supply system |
| CN107947230A (en) * | 2017-12-01 | 2018-04-20 | 阳光电源股份有限公司 | A kind of Countercurrent prevention control method of photovoltaic generating system, apparatus and system |
| 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 |
| CN114825471A (en) * | 2022-06-28 | 2022-07-29 | 长沙矿冶研究院有限责任公司 | Automatic coordination control method and system for light storage charging and discharging micro-grid system |
| 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 |
| CN115224742A (en) * | 2022-09-21 | 2022-10-21 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
| 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 |
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| CN102832637B (en) | 2015-01-21 |
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Owner name: XUJI ELECTRIC CO., LTD. Free format text: FORMER OWNER: XUJI GROUP CO., LTD. Effective date: 20131209 |
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Effective date of registration: 20131209 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: Xuji Electric Co., Ltd. Applicant after: State Grid Corporation of China Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Group Co., Ltd. Applicant before: State Grid Corporation of China |
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