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A microgrid structure and its power quality control method

A technology of power quality and micro-grid, applied in the field of power grid, to reduce operating costs, improve anti-islanding capabilities, and compensate for voltage fluctuations

Active Publication Date: 2018-05-18
CHANGSHA VICTORY ELECTRICITY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, these methods only solve some power quality problems of microgrids, and for grid-connected microgrids with complex structures and diverse loads, it is necessary to comprehensively consider various factors affecting power quality problems to improve the power supply reliability of microgrids as much as possible. and power quality

Method used

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  • A microgrid structure and its power quality control method
  • A microgrid structure and its power quality control method
  • A microgrid structure and its power quality control method

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Embodiment Construction

[0040] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0041] figure 1 It is a topological structure diagram of a microgrid according to an embodiment of the present invention, in which both the distributed micro-sources and the common bus have nonlinear loads. Among them, the microgrid includes several distributed micro sources, a common bus, an inverter for compensation and an isolation transformer, and also includes a nonlinear load, a linear load, a first switch K, and a static switch S. Wherein, the several distributed micro-sources (power generation units) are connected in parallel, the distributed micro-sources are connected with the nonlinear load and the linear load, the several distributed micro-sources are connected to the common bus throu...

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Abstract

The invention provides a micro-grid structure and a power quality control method thereof. The micro-grid structure comprises a plurality of distributive micro sources and a common busbar. The distributive micro sources are parallelly connected to the common busbar through corresponding feeder lines and respectively connected with nonlinear loads and linear loads, and the common busbar is connected with the nonlinear loads and the linear loads. A first switch is in parallel connection with an isolation transformer to control an input state of an inverter for compensation. A static switch which is an option switch is arranged at a point of common coupling, and option ends of the static switch correspond to a large power grid side and a ground terminal respectively.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a micro-grid structure and a power quality control method thereof. Background technique [0002] At present, combined with the power consumption and management needs of the power grid, more and more user grids have established grids through the grid-connected mode of large grids and micro-grids. By controlling the operation of large grids and micro-grids, the power of the entire user grid is controlled. quality. [0003] As an effective carrier of distributed power, microgrid includes various forms of micro sources, energy storage devices, energy conversion devices, protection devices and load control devices, as well as small power generation systems that can realize self-control, protection and management. It operates in both island and grid-connected modes. [0004] The microgrid provides a new and effective way to improve the reliability of power supply in the power sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/38H02J3/388Y02E40/40
Inventor 杨建钟朝露侯小超韩华孙尧原文宾粟梅于晶荣
Owner CHANGSHA VICTORY ELECTRICITY TECH
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