Jun-Hyeok Park, Hye-Won Choi, and Kyo-Beum Lee, "Analysis and Suppression of Zero-Sequence Circulating Current in Parallel Three-Level Inverters using Improved Interleaved DPWM," in Proc. IPEC (ECCE-Asia) Conf., May 2022, pp. 845-848. > Paper

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Paper

International Conference Jun-Hyeok Park, Hye-Won Choi, and Kyo-Beum Lee, "Analysis and Suppression of Zero-Sequence Circulating Current in Parallel Three-Level Inverters using Improved Interleaved DPWM," in Proc. IPEC (ECCE-Asia) Conf., May 2022, pp. 845-848.

2022

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This paper analyzes the switching sequence of an improved interleaved discontinuous pulse width modulation (IIDPWM). An interleaved PWM is used

to improve the output current quality of parallel inverters. However, the carrier phase difference caused by the interleaved PWM inevitably generates

zero-sequence circulating current (ZSCC). The IIDPWM is the interleaved DPWM applied the carrier phase shift algorithm to suppress ZSCC and has

been proposed only in parallel two-level inverters. This paper proposes the IIDPWM applied to parallel three-level inverters for higher power capacity

and better output current quality. The switching sequence analysis of the proposed method proves that it has significant ZSCC suppression

performance even at high modulation index (MI). The effectiveness of the proposed modulation method is verified by the simulation results. 

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