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Title
Japanese: 
English:A Protection Circuit for the Shunt Capacitor equipped with a Series Inverter under Voltage Sags 
Author
Japanese: CIRILO Leandro Guilherme, 佐野 憲一朗, Naotaka Okada.  
English: Guilherme Cirilo Leandro, Kenichiro Sano, Naotaka Okada.  
Language English 
Journal/Book name
Japanese: 
English:5th IEEE Workshop on the Electronic Grid (eGrid 2020) 
Volume, Number, Page        
Published date Nov. 2020 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:5th IEEE Workshop on the Electronic Grid (eGrid 2020) 
Conference site
Japanese: 
English: 
Abstract This paper proposes a protection circuit for the shunt capacitor equipped with a series inverter (active SC) under a voltage sag in the distribution grid. The voltage sag causes the discharge of the shunt capacitors, resulting in a large inrush current that may damage the series inverter. The proposed protection circuit is composed of varistors connected in parallel with the inverters, and a series AC circuit breaker. When the large inrush current flows into the inverter, all of its power devices are turned off. Then, almost all of the inrush current flows into the varistors. As a result, the proposed method mitigates the inrush current of the inverter. Computer simulations are carried out to investigate the behavior of the active SC during balanced and unbalanced voltage sags. Simulation results demonstrate that the proposed protection circuit is able to mitigate the overcurrent in the inverter by a factor close to 2.5 under a balanced voltage sag. It was also verified that the circuit protects the inverter from unbalanced voltage sags caused by a single and double-line-to-ground faults.

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