Parallel voltage sag compensator without an injection transformer

Woo-Young Choi, Min-Kwon Yang () and Yu-Jin Kim
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Woo-Young Choi: Chonbuk National University
Min-Kwon Yang: Chonbuk National University
Yu-Jin Kim: Chonbuk National University

International Journal of System Assurance Engineering and Management, 2020, vol. 11, issue 4, No 15, 856-863

Abstract: Abstract A parallel voltage sag compensator (PVSC) is a power electronics device to compensate the voltage sag and interruption. The conventional PVSC uses an energy storage device and a bidirectional inverter with an injection transformer. However, the injection transformer reduces the power efficiency with high power losses. This paper proposes a PVSC without the injection transformer. The proposed PVSC has a bidirectional DC–DC converter to transfer the electrical power between the energy storage device and the bidirectional inverter. It uses the common-mode filter capacitors for the AC-side filter in the bidirectional inverter. The ground leakage current can be effectively suppressed between the energy storage device and the AC voltage. The proposed system has high power efficiency and low ground leakage current. Experimental results are discussed to evaluate the performance of the proposed system.

Keywords: Voltage sag; Compensatorinjection transformer; Bidirectional DC–DC converter; Bidirectional inverter; Ground leakage current (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s13198-019-00930-6

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