Seamless Transfer Algorithm of AC Microgrid Inverter Compensating Load Current for Weak Grid

Jae-Uk Lim, Il-seob Kwon, Hag-Wone Kim and Kwan-Yuhl Cho
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Jae-Uk Lim: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea
Il-seob Kwon: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea
Hag-Wone Kim: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea
Kwan-Yuhl Cho: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea

Energies, 2019, vol. 12, issue 4, 1-15

Abstract: In this paper, we propose a voltage control technique for the seamless transfer algorithm of a microgrid inverter. When the microgrid inverter is switched from grid-connected mode to standalone operation mode, an output voltage transient may occur, and adversely affect the load. To solve this, seamless transfer algorithms that complete mode switching within 4 ms have been studied. However, previous control techniques have very complex structures. In this study, we find the cause of the voltage transient occurring in the mode conversion, through state average modeling of the inverter. Subsequently, we propose a feed-forward compensator for seamless transfer. The cause of the voltage transient is removed by the compensation, and smooth mode switching is achieved. The proposed controller is verified by Powersim (PSIM) simulations.

Keywords: microgrid; inverter; seamless transfer (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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