Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid

Xiangzhen Yang; Haixi Zhao; Mengke Duan; Yan Du; Haining Wang; Jian Zhang

doi:10.17775/CSEEJPES.2020.01990

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Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid

Regular Papers | 更新时间：2026-10-15

- Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid
- CSEE Journal of Power and Energy Systems Vol. 10, Issue 1, Pages: 222-234(2024)
- 作者机构：
  
  1. School of Electrical Engineering and Automation. Hefei University of Technology,Hefei,China
  2. NR Electric,Nanjing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2020.01990
  CLC：
- Published：01 January 2024
- 稿件说明：
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Xiangzhen Yang, Haixi Zhao, Mengke Duan, et al. Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid[J]. CSEE Journal of Power and Energy Systems, 2024, 10(1): 222-234.
DOI：

Xiangzhen Yang, Haixi Zhao, Mengke Duan, et al. Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid[J]. CSEE Journal of Power and Energy Systems, 2024, 10(1): 222-234. DOI： 10.17775/CSEEJPES.2020.01990.

摘要

Abstract

The negative-sequence reactive power-conductance (Q-G) droop control strategy is a conventional method to compensate for the output unbalanced voltages in an islanded MG. Nevertheless

the conflict between unbalanced voltage compen-sation and negative-sequence reactive power sharing

caused by the impedance mismatching of distribution lines and distributed generators

has not been solved only by Q-G droop control. In this paper

a distributed cooperative secondary unbalanced voltage control strategy is proposed to decrease the output voltage unbalance factor (VUF) of each droop-controlled DG

as well as to further enhance the negative-sequence reactive power sharing effectiveness among DGs by properly shifting up and down the Q-G droop characteristics of each DG. An algorithm for adaptive VUF weight coefficient is proposed to better suppress VUF under severe imbalance conditions. Furthermore

a negative-sequence small-signal model of an MG under an unbalanced condition

considering the communication delay time of the proposed SUVC

is established to analyze the system's stability and transient performance under the influence of some critical parameters. Finally

the effectiveness of the proposed strategy is validated by the simulation results from a real-time emulator of StarSim HIL.

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