Multi-Mode Voltage Sag/Swell Generator Based on Three-Phase Inverter Circuit

Qiguo Han, Xing Wang, Pengfei Hu, Maolin Wang, Xu Luo and Weihua Hou
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Qiguo Han: School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China
Xing Wang: School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China
Pengfei Hu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Maolin Wang: School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China
Xu Luo: School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China
Weihua Hou: School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China

Energies, 2021, vol. 14, issue 20, 1-15

Abstract: The voltage ride through capability of the major auxiliary variable-frequency drive (VFD) in large thermal power plants is the key technical issue of power grid and source coordination. In order to test the high voltage ride through (HVRT) and low voltage ride through (LVRT) capability of the auxiliary VFD, it is necessary to develop a power supply to simulate different grid voltage sag and swell accurately. In this paper, a generator (VSSG) based on the common three-phase inverter circuit that can simulate multi-mode voltage sag/swell is proposed. The designed main circuit consisting of transformer, rectifier, DC split capacitors, three-phase inverter, and LC-filter can generate single-phase and three-phase voltage sag, swell, and phase angle jumping flexibly. The developed control strategies composed of the double closed-loop control and the neutral voltage balance control achieve accurate output, fast dynamic response, and step-less adjustment. Simulation and experiment results verify the multi-mode voltage simulation performances of the proposed VSSG, which can be effectively used to emulate power grid voltage sag and swell phenomena under the IEEE 1159 and IEC standards.

Keywords: voltage sag/swell generator (VSSG); voltage sag; voltage swell; voltage phase angle jumping; three-phase inverter circuit (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: 2021
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