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Composite Sliding Mode Control of Phase Circulating Current for the Parallel Three-Phase Inverter Systems

Author

Listed:
  • Weiqi Zhang

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Yanmin Wang

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Fengling Han

    (Solar Energy Application Group (SEAL), RMIT University, Melbourne, VIC 3001, Australia)

  • Rebeca Yang

    (Solar Energy Application Group (SEAL), RMIT University, Melbourne, VIC 3001, Australia)

Abstract

The phase circulating current (PCC) of the parallel three-phase inverter systems dramatically affects the power quality and conversion efficiency of the power grid. In this paper, a composite suppression strategy is proposed to solve the PCC issue by using the sliding mode control (SMC) approach and improved virtual impedance droop control. Taking the commonly used 2-group parallel three-phase inverter as an example, an inter- and intra-classification model is established by analyzing the sources of PCC. In order to suppress the inter-PCC, the traditional virtual impedance droop control is given, following the improved substitute by combining SMC. And the variables of the bus voltage, Q - U loop, P - f loop, and the virtual-induced reactance are also introduced for the robust control of the impedance droop. On the other side, a SMC-based suppression approach is designed to solve the issue of the intra-PCC. Its idea is to introduce a regulation factor for the space vector pulse width modulation (SVPWM) so that the zero-sequence voltage can be eliminated and the influence of the intra-PCC can be relieved. Comparative simulations and experiments validate the effectiveness of the methods proposed in this paper.

Suggested Citation

  • Weiqi Zhang & Yanmin Wang & Fengling Han & Rebeca Yang, 2024. "Composite Sliding Mode Control of Phase Circulating Current for the Parallel Three-Phase Inverter Systems," Energies, MDPI, vol. 17(6), pages 1-28, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1389-:d:1356554
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