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

Weiqi Zhang, Yanmin Wang (), Fengling Han () and Rebeca Yang
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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

Energies, 2024, vol. 17, issue 6, 1-28

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.

Keywords: parallel three-phase inverter; phase circulating current; sliding mode control; virtual impedance droop control; composite control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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