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Method and device for flexible grid-connection of optical storage power generation system based on UPFC

A photovoltaic storage power generation and flexible technology, applied in photovoltaic power generation, circuit devices, flexible AC transmission systems, etc., can solve problems such as three-phase imbalance, node voltage fluctuations, frequency fluctuations, etc., to ensure safety and reliability, The effect of reducing the risk of grid connection shock

Active Publication Date: 2019-03-01
XUJI GRP +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible grid-connection method and device for a solar-storage power generation system based on UPFC, which is used to solve node voltage fluctuations, three-phase unbalance, The problem with frequency fluctuations

Method used

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  • Method and device for flexible grid-connection of optical storage power generation system based on UPFC
  • Method and device for flexible grid-connection of optical storage power generation system based on UPFC
  • Method and device for flexible grid-connection of optical storage power generation system based on UPFC

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] method embodiment

[0024] figure 1 It is the flexible grid-connected system of UPFC-based photovoltaic storage power generation system of the present invention, including photovoltaic storage power generation system, UPFC and large power grid; wherein the photovoltaic storage power generation system includes load, photovoltaic array, energy storage system; load, photovoltaic array, energy storage system Connected to the DC bus; UPFC includes a parallel-side converter 1, a series-side converter 2, a series transformer, a parallel transformer, and a DC capacitor, and a DC capacitor C is connected in parallel with the two converters.

[0025] Among them, the parallel side converter 1 is connected to the AC bus of the photovoltaic storage power generation system through a parallel transformer. Work provides active power, which behaves as a controlled cu...

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Abstract

The invention relates to a method and a device for flexible grid-connection of an optical storage power generation system based on UPFC. The method comprise: collecting voltage amplitude and phase ofan optical storage power generation system and voltage amplitude and phase of a large power grid; and calculating voltage amplitude difference and phase deviation of the optical storage power generation system and the large power grid; control the UPFC to use the voltage amplitude difference and the phase deviation as targets, and injecting compensation voltage to a grid-connected node, to realizegrid connection of the optical storage power generation system and the large power grid. The method can realize seamless and flexible paralleling and splitting of the optical storage power generationsystem and the large power grid, so that equipment of the large power grid can operate efficiently, and power supply reliability and overall stability are improved.

Description

technical field [0001] The invention belongs to the field of power system power flow control and photovoltaic power generation, and specifically relates to a flexible grid-connection method and device for a photovoltaic storage power generation system based on UPFC. Background technique [0002] At present, the grid-connected methods of off-grid solar-storage power generation systems generally include direct grid-connected technology and virtual synchronous generator grid-connected technology. When it is consistent, close the grid-connection switch directly. This method will inevitably produce large shocks and vibrations, which will easily cause grid-connection failure or even damage the system. The principle of virtual synchronous generator grid-connected technology is to use the virtual generator characteristics of the converter to use it as a voltage source to realize the grid-connected solar storage power generation system. This method has a high threshold and lack of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/38H02J3/40H02J3/28
CPCH02J3/383H02J3/1814H02J3/28H02J3/40Y02E10/56Y02E40/10
Inventor 马红伟徐军郭宝甫杨慧彪田盈王卫星丁茂生李旭涛顾雨嘉梁剑
Owner XUJI GRP
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