A Restoration Method for Distribution System Based on Projection of Multiple Microgrids

doi:10.11930/j.issn.1004-9649.202405103

Abstract

Abstract:

The participation of microgrids in distribution system restoration can improve the restoration effects and thereby enhance the system resilience. A restoration method for distribution system with multiple microgrids is proposed, which considers the microgrids' privacy and restoration preferences, and can coordinate the power generation resources of the distribution network and microgrids. Firstly, a coordination mechanism for multiple microgrids to participate in distribution network restoration based on virtual nodes and virtual flow decomposition is established to effectively protect the privacy of microgrids. Subsequently, a projection-based critical restoration information-sharing method is proposed to solve the restoration problem, and the vertex search is used to quickly obtain the projection domain and realize critical information interaction. And then, a two-layer coordinated restoration framework for the distribution network and microgrid is proposed, in which the lower microgrid provides limited information including restoration preferences and feasible domain to the distribution network; the upper distribution network makes overall decisions and sends the tie-line power obtained by the decision to the microgrid, and the lower microgrid uses the tie-line power as the constraints to determine the internal load restoration. Finally, based on the constructed power distribution system with multiple microgrids, the effectiveness and advantages of the proposed method is verified.

Key words: resilience, distribution system restoration, restoration, microgrid

Shiyan ZHU, Yin XU, Jinghan HE, Ying WANG. A Restoration Method for Distribution System Based on Projection of Multiple Microgrids[J]. Electric Power, 2024, 57(9): 224-230.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202405103

https://www.electricpower.com.cn/EN/Y2024/V57/I9/224

Figures/Tables 12

Fig.1 Virtual node of microgrid

Fig.2 Virtual stream decomposition for energy restoration

Fig.3 Vertex search algorithm

Fig.4 The power distribution system with multiple microgrids

Fig.5 The two-layer restoration process

Fig.6 Case of a power distribution system with 3 microgrids

Fig.7 Feasible domain of coordination variable projection of MG1

Fig.8 Distribution system topology after restoration

Fig.9 The active output of each power source and each microgrid tie line

Table 1 The restoration status of microgrid load

微电网		恢复负荷
MG1		一级负荷5、一级负荷11
MG2		一级负荷5
MG3		一级负荷1、一级负荷7、二级负荷5

Fig.10 The active power of microgrid power supply and tie line

Table 2 The restoration status of load

方法	负荷类型	配电网	MG1	MG2	MG3
策略1	一级	6、16、18、28	5	—	1、7
策略1	二级	—	7	—	3、6
策略2	一级	6、9、16、18、28	5、11	5	1、7
策略2	二级	7、26	—	—	—
本文方法	一级	6、9、16、18、28	5、11	5	1、7
本文方法	二级	—	—	—	3、5

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