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http://dx.doi.org/10.6113/JPE.2018.18.2.502

Analyzing and Designing a Current Controller for Circulating Current Reduction in Parallel Three-Phase Voltage-Source Inverters  

Kim, Kiryong (Department of Electrical Engineering, Pusan National University)
Shin, Dongsul (LG Electronics)
Kim, Hee-Je (Department of Electrical Engineering, Pusan National University)
Lee, Jong-Pil (Power Conversion Research Center, HVDC Research Division, KERI)
Publication Information
Journal of Power Electronics / v.18, no.2, 2018 , pp. 502-510 More about this Journal
Abstract
A circulating current is a major problem caused by directly connecting voltage-source inverters (VSIs) in parallel. This circulating current occurs as a zero-sequence current between the inverters by specific switch states. Several studies have presented alternatives using hardware and software methods. When coupled inductors (CIs) are employed for the high-frequency circulating current, a controller is required to prevent the low-frequency circulating current from saturating the CIs. In this study, the zero-sequence circulating current and its alternatives are investigated using hardware and mathematical description. A high-performance circulating current controller is proposed by applying a repetitive controller to the zero-sequence current control loop. The proposed controller can effectively minimize the low-frequency circulating current without any data sharing between the inverters in unfavorable conditions. It can also be applicable to the modular configuration of parallel three-phase VSIs. Experimental results verify the performance of the proposed controller.
Keywords
Circulating current; Parallel operation; Voltage source inverter (VSI);
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Times Cited By KSCI : 1  (Citation Analysis)
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