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Alternating current and direct current hybrid microgrid group multi-mode coordination control method and device

A technology of AC-DC hybrid and micro-grid group, applied in the direction of AC network load balancing, electrical components, etc., can solve the problems of complex interaction characteristics of sub-micro-grids, reduce the number of charging and discharging, improve the service life of energy storage, and maintain system stability Effect

Pending Publication Date: 2019-10-11
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

The above control strategy realizes the power interaction of the AC-DC hybrid microgrid, but when the hybrid microgrid group consisting of three or more sub-microgrids is taken as the research object, the interaction characteristics between the sub-microgrids are more complicated, and the application of the above control strategy sex needs further research

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  • Alternating current and direct current hybrid microgrid group multi-mode coordination control method and device
  • Alternating current and direct current hybrid microgrid group multi-mode coordination control method and device
  • Alternating current and direct current hybrid microgrid group multi-mode coordination control method and device

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Embodiment Construction

[0072] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0073]The purpose of this application is to realize the independent distribution of power of the AC-DC hybrid microgrid group, ensure the stability of the system, and realize the mutual conversion of various operating modes of the AC-DC hybrid microgrid group in the case of normal communication and failure, so as to reduce system power loss and improve energy storage. service life. First, according to the power flow, the system is divided into three operating modes, namely: sub-microgrid autonomous mode, inter-grid coordination mode, and energy storage balance mode; secondly, based on...

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Abstract

The invention relates to an alternating current and direct current hybrid microgrid group multi-mode coordination control method and device. The method comprises the steps that in a normal condition,all sub-microgrids are in an autonomous running state: each sub-microgrid can realize supply and demand balance of power in the sub-microgrid by effectively controlling a DPDG; when relatively large power fluctuation occurs in a certain sub-microgrid, a current mode is switched to an inter-network coordination mode: system power balance is maintained through power interaction among the sub-microgrids; and when a hybrid microgrid group requires an energy storage system to maintain the system power balance, the inter-network coordination mode is switched to an energy storage balance mode. Compared with the prior art, the method has the advantages that autonomous power distribution of the alternating current and direct current hybrid microgrid group can be realized, and reasonable mode switching of the system under normal communication and fault conditions can be realized, so that the operation efficiency of the system is improved, and the like.

Description

technical field [0001] The invention relates to the field of coordinated control design of an AC-DC hybrid micro-grid group, in particular to a multi-mode coordinated control method and device for an AC-DC hybrid micro-grid group. Background technique [0002] AC-DC hybrid microgrid has received extensive attention because it has efficient AC and DC power access ports and can provide flexible power supply types [1-3]. However, the working capacity of a single microgrid is limited and its anti-disturbance ability is weak [4]. The AC and DC microgrids that are geographically adjacent to each other are interconnected to form a microgrid cluster system, that is, the AC and DC hybrid microgrid group. There is a group public node between the AC and DC hybrid microgrid group and the distribution network, which can realize the hybrid microgrid group on / off grid operation. The group neutron microgrid not only has perfect microgrid characteristics, but also accepts group-level schedu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/32
CPCH02J5/00H02J3/32
Inventor 韩云昊宋根新米阳宋元元
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER