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Distributed photovoltaic system and grid-connected control method thereof

A distributed photovoltaic and control method technology, applied in photovoltaic power generation, system integration technology, information technology support system, etc., can solve problems such as voltage and frequency fluctuations, affecting the safe and stable operation of regional power grids, and affecting the quality of electricity used by surrounding users. Achieve the effects of reducing impact, reducing impact, and avoiding delay waiting

Pending Publication Date: 2021-01-15
STATE GRID JIBEI ELECTRIC POWER COMPANY LIMITED CHENGDE POWER SUPPLY +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of distributed photovoltaics connected to the grid at the same time will bring voltage and frequency fluctuations, affect the quality of power consumption of surrounding users, and even affect the safe and stable operation of the regional power grid.

Method used

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  • Distributed photovoltaic system and grid-connected control method thereof
  • Distributed photovoltaic system and grid-connected control method thereof
  • Distributed photovoltaic system and grid-connected control method thereof

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "com...

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Abstract

The invention provides a distributed photovoltaic system and a grid-connected control method thereof. The grid-connected control method is applied to a controller in the distributed photovoltaic system, and after a line is detected to be recovered to be electrified, if each distributed photovoltaic system in communication connection is determined to need to perform grid-connected recovery work after power failure, power transmission precedence corresponding to the distributed photovoltaic system and the grid-connected delay time of the distributed photovoltaic system are determined according to a preset grid-connected sequence, and after the grid-connected delay time is over, controlled equipment of the distributed photovoltaic system is controlled to work to recover grid connection. Therefore, according to the grid-connected control method provided by the invention, orderly grid connection recovery of each distributed photovoltaic system can be realized, the impact on the power grid when a large amount of distributed photovoltaic systems are simultaneously connected to the grid is reduced, and the influence on the power utilization quality of surrounding users is decreased.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a distributed photovoltaic system and a grid-connected control method thereof. Background technique [0002] With the rapid development of distributed photovoltaics in recent years and the explosive growth of installed capacity, it is accompanied by the need for a single substation, transformer, and line to bring more photovoltaic users. In the case of power grid equipment, that is, transformers, lines, etc., which carry more photovoltaics and have a larger installed capacity, if the power grid equipment is powered off and then powered on again, a large number of distributed photovoltaics will be connected to the grid for power generation at the same time. Specifically: When the grid equipment is powered off and the photovoltaic users lose power, when the line resumes power transmission, the photovoltaic inverter detects that the line resumes power transmiss...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J13/00
CPCH02J3/381H02J13/00022H02J13/00001H02J2300/24Y04S10/123Y02E10/56Y02E40/70Y04S40/126Y02E60/00
Inventor 尹兆磊白明辉刘健孙荣富丁然席海阔袁绍军王靖然徐海翔陈璨王轶刘驰孙中琦
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY LIMITED CHENGDE POWER SUPPLY
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