Microgrid smooth switch control method based on composite energy storage
A composite energy storage and smooth switching technology, which is applied in the field of power transmission and distribution in power systems, can solve problems such as power shortage, asynchronous microgrid and public distribution network, and degradation of power quality, so as to achieve high power density and improve power supply reliability and power supply quality, reducing shock and vibration effects
Inactive Publication Date: 2015-01-21
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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Problems solved by technology
[0006] The purpose of the present invention is to solve the serious decline in power quality caused by the power shortage when the micro-grid is switched from grid-connected to unplanned island in the prior art, and the problem that the micro-grid and the public distribution network are not synchronized when the micro-grid is grid-connected problem, to provide a micro-grid smooth switching control method and strategy based on composite energy storage
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[0040] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
[0041] The micro-grid smooth switching control method and strategy based on composite energy storage involved in this embodiment sets a low-voltage micro-grid containing multiple distributed power sources. The public connection point PCC, each distributed power source and all supporting The switch of the circuit is monitored by the microgrid energy management system EMS. The microgrid energy management system EMS determines whether the low-voltage microgrid is in an island operation state or a grid-connected operation state by detecting the open / close state of the microgrid common connection point PCC. It is characterized in that : A composite energy storage unit is set in the low-voltage microgrid containing multiple distributed power sources, and the composite energy storage unit is used to control the smooth switching of the microgrid on the basis ...
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The invention relates to a microgrid smooth switch control method and strategy based on composite energy storage. According to the invention, a low voltage microgrid containing a plurality kinds of distributed power supplies is arranged, a public connecting point PCC in the low voltage microgrid, the distributed power supplies and the switches of all branches are monitored by a microgrid energy management system EMS, and the microgrid energy management system EMS detects the on / off state of the public connecting point PCC of the microgrid to judge whether the low voltage microgrid is located at an isolated island operation state or a grid-connected operation state. The microgrid smooth switch control method is characterized in that a composite energy storage unit composed of a supercapacitor and a storage battery is arranged in the low voltage microgrid containing the plurality kinds of distributed power supplies, and the composite energy storage unit is used for performing microgrid smooth switch control on the basis of the monitoring of the microgrid energy management system EMS on the low voltage microgrid. According to the invention, the composite energy storage characteristics are fully utilized to greatly improve the power supply reliability and power supply quality of the microgrid under a switch emergency state to facilitate the generalization and application of the microgrid.
Description
technical field [0001] The invention relates to a micro-grid smooth switching control method, in particular to a micro-grid smooth switching control method and strategy based on composite energy storage. It belongs to the technical field of electric power transmission and distribution. Background technique [0002] The microgrid has two operating modes: grid-connected and island-connected. Under normal circumstances, the microgrid and the public distribution network operate in parallel, and its voltage and frequency stability are supported by the public distribution network. When the distribution network or the microgrid fails , the point of public connection (PCC) between the microgrid and the distribution network will be disconnected immediately, and the microgrid will change from the grid-connected operation state to the island operation state. For most microgrids, the output of distributed power generation using renewable resources in the microgrid cannot fully meet the...
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IPC IPC(8): H02J3/38H02J3/28
Inventor 刘志文夏文波刘明波陈志刚孙浩张磊
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD