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Parallel Operation Systems of Z-Source Inverters for Fuel Cell Systems  

Moon Hyun-Wook (중앙대 대학원 전자전기공학부)
Jeong Eun-Jin (중앙대 대학원 전자전기공학부)
Kim Yoon-Ho (중앙대 전자전기공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.10, no.5, 2005 , pp. 443-449 More about this Journal
Abstract
In this paper, parallel operation systems with Z-source Inverters for the fuel cell systems are discussed. The carrier phase shifted SPWM(Sinusoidal Pulse Width Modulation) has an advantage in reducing harmonics of output current. However when this technique applies in parallel operation of Z-source inverters, it additionally produces circulating currents. The circulating current is analyzed and a method to prevent the circulating current is applied to the parallel operation systems of Z-source inverters. To maintain high performance with reduced circulating current in inverter output and low harmonic components in load current, circulating current reactors are used. The proposed approach is verified through simulation and experiment.
Keywords
Z-source Inverter; Parallel Operation; Carrier Phase-Shifted SPWM; Circulating Current;
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