Jun-Hyeok Park and Kyo-Beum Lee, "An Improved Five-Level Space Vector Modulation Method on Parallel Three-Level Inverters to Suppress Circulating Current and Leakage Current," in Proc. ICEE Conf., 2022. > Paper

This paper proposes an improved five-level space vector modulation (SVM) method to suppress circulating current and leakage current simultaneously. A parallel operation of threelevel inverters has recently been used to increase the power rating in many applications, including photovoltaic (PV), wind power, and medium voltage motor drive systems. An interleaved pulse width modulation (PWM) of the parallel inverters is used to improve the output current quality. However, the carrier phase difference due to the interleaved PWM generates a significant circulating current, which causes current 

distortion and power losses. To solve this problem of the interleaved PWM, the existing proposed method is a five-level SVM method. This 

modulation method guarantees a better output current quality and a lower circulating current than the interleaved PWM. This method has a trade-off 

that the leakage current increases due to the high frequency of the common-mode voltage (CMV). The leakage current is an important consideration 

in PV and motor drive systems because of many safety issues and degradation of the output current quality. This paper proposes an improved 

modulation method to suppress the leakage current and the circulating current and improve the quality of the output current. The feasibility and effectiveness of the proposed method are verified by the simulation results.