Research on the Control Method of the PV Grid-Connected Inverter under an Asymmetrical Power Grid Fault

Shiji Tian, Min Lu (), Ruikang Wang and Di’an Liu
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Shiji Tian: School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832007, China
Min Lu: School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832007, China
Ruikang Wang: School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832007, China
Di’an Liu: School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832007, China

Energies, 2023, vol. 16, issue 22, 1-15

Abstract: The negative-sequence current component and harmonic components generated when an asymmetrical fault occurs in the power grid seriously affect the normal operation of the photovoltaic (PV) grid-connected inverter. In order to suppress the negative-sequence current component and the harmonic component of the grid-connected current, and to meet the normal grid-connected operation requirements of the PV grid-connected inverter when asymmetrical faults occur in the grid, this paper proposes the proportional integral double-resonant (PI-DR) current controller, which consists of the PI controller and double-resonant controllers. The PI-DR current controller can directly control the negative-sequence current component and the grid-connected current harmonic component in the output current in the forward synchronous rotating coordinate system, without decomposing the positive and negative sequence currents. The PI-DR current controller ensures that the PV grid-connected inverter can realize normal grid-connected operation and improves the quality of the power when an asymmetrical fault occurs in the power grid. MATLAB/Simulink experiments show that the PI-DR current controller can improve the dynamic characteristics of the PV grid-connected inverter and improve the operating capability of the system when an asymmetrical fault occurs in the power grid.

Keywords: asymmetrical power grid fault; PV grid-connected inverter; negative-sequence current component; harmonic components; the PI-DR current controller (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: 2023
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