Hye-Won Choi and Kyo-Beum Lee, "Reduction Method of Circulating Current for Parallel Connected Inverters Using Proportional Resonant Control," in Proc. ICPE (ECCE ASIA) Conf., May 2023. > Paper

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International Conference Hye-Won Choi and Kyo-Beum Lee, "Reduction Method of Circulating Current for Parallel Connected Inverters Using Proportional Resonant Control," in Proc. ICPE (ECCE ASIA) Conf., May 2023.

2023

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This paper proposes a reduction method of circulating current for parallel connected inverters using proportional resonant (PR) control. Paralleled 

inverter has been increasingly applied in many power conversion systems such as renewable energy systems, motor drives, and energy storage 

systems. Modular inverters have several advantages of convenient maintenance and adjustable rating of power by the number of modules. 

However, a circulating current of paralleled inverter is generated due to the difference in the output parameters in each module. The circulating 

current distorts the quality of output current and deteriorates the performance of the parallel systems. To mitigate the problems, a reduction 

method is proposed using the PR controller of the paralleled connected inverter. The PR control method extracts the third harmonics of output 

current to reduce the circulating current of low-frequency component. The proposed method controls the low-frequency circulating current 

applying only controllers. The simulation results demonstrate the validity of the proposed control method.

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