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Regular Paper | Open Access

Coordinated Control of Parallel Three-phase Four-wire Converters in Autonomous AC Microgrids

Rui Liu1, Li Guo1, Xialin Li1( )
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
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Abstract

The coordinated control of parallel three-phase four-wire converters in autonomous AC microgrids is investigated in this paper. First, based on droop control, virtual impedance is inserted in positive-, negative- and zero-sequences to enhance system damping and imbalance power sharing. Then, to facilitate virtual impedance design, small signal models of the three-sequence equivalent circuits are established respectively. Corresponding indexes are proposed to comprehensively evaluate the impact of sequence virtual impedance on current sharing accuracy, voltage quality at the point of common coupling (PCC) and system stability. In addition, constraint of DC-link voltage is also considered to avoid over modulation when subjected to unbalanced loads. Furthermore, to address the PCC voltage degradation resulting from virtual impedance, a voltage imbalance compensation method, based on low-bandwidth communication, is proposed. Finally, simulation and experimental results are provided to verify the correctness of the theory model, indicating that the proposed method can achieve PCC voltage restoration while guaranteeing the current sharing accuracy with desirable dynamics.

Keywords

AC microgridssequence virtual impedancethree-phase four-wire (3P4W) convertervoltage imbalance compensation

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 5,
September 2024
Pages 2065-2078
DOI: 10.17775/CSEEJPES.2020.03650
Cite this article:
Liu R, Guo L, Li X. Coordinated Control of Parallel Three-phase Four-wire Converters in Autonomous AC Microgrids. CSEE Journal of Power and Energy Systems, 2024, 10(5): 2065-2078. https://doi.org/10.17775/CSEEJPES.2020.03650

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Received: 31 July 2020
Revised: 31 December 2020
Accepted: 22 February 2021
Published: 30 December 2021
© 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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