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Regular Paper | Open Access

Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid

Xiangzhen Yang1, Haixi Zhao1, Mengke Duan2, Yan Du1( ), Haining Wang1, Jian Zhang1
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 23009, China
NR Electric, Nanjing 211102, China
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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 compensation 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.

Keywords

Distributed cooperative controlMGnegative-sequence reactive powerstarsim real-time platformtime delayvoltage unbalance compensation

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 1,
January 2024
Pages 222-234
DOI: 10.17775/CSEEJPES.2020.01990
Cite this article:
Yang X, Zhao H, Duan M, et al. Distributed Cooperative Secondary Voltage Control in an Unbalanced Microgrid. CSEE Journal of Power and Energy Systems, 2024, 10(1): 222-234. https://doi.org/10.17775/CSEEJPES.2020.01990

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Received: 19 May 2020
Accepted: 23 July 2020
Published: 06 October 2020
© 2020 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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