Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title Circulating current suppression method of grid-connected inverters in parallel using serial communication
Authors 전세봉(Se-Bong Jeon) ; 조성준(Sung-Joon Cho) ; 이교범(Kyo-Beum Lee)
DOI https://doi.org/10.5370/KIEE.2021.70.6.878
Page pp.878-886
ISSN 1975-8359
Keywords Circulating current; Grid-connected inverter; Serial communication; PWM synchronization
Abstract This paper proposes a circulating current suppression method of grid-connected inverters in parallel inverters using serial communication. The grid-connected inverter for large scale photovoltaic generation system consists of multiple modules in parallel based in unit inverter module. The existing method to synchronize PWM signals between inverter modules was implemented by CAN communication with high interrupt priority. However, the high priority of CAN communication can cause deterioration in current control performance due to limited resource of controller. This paper introduces an improved synchronization method of PWM signals with low interrupt priority using time stamp function. The effectiveness of the proposed method is verified by experimental results with 250kW inverter system