Analytical Calculation of Switching Loss of Single-Phase Neutral Point Clamped H-Bridge Cascaded Inverters Based on SVPWM
Yuan Jingxin1, Zhu Junjie1, Nie Ziling1, Ye Weiwei1, Jia Yingjie1, Dong Lei2
1. National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 China; 2. Military Representative Office of Naval Equipment Departments in Shanghai and Ningbo Ningbo 315000 China
Abstract：In order to optimize the performance of single-phase neutral point clamped (NPC) H-bridge cascaded inverter, the calculation method of switching loss based on pulse-shifting space vector pulse width modulation (SVPWM) voltage-sharing modulation is analyzed. To solve the problem that the effective switching frequency and control frequency are different, and the switching action is scattered and irregular, a new method based on the pulse-shifting SVPWM voltage-sharing modulation is proposed. The total switching loss calculation method directly calculates the sum of all switching transient losses. Aiming at the uncertainty of balancing voltage redundancy vector action, a maximum estimation method is proposed to estimate the switching transient losses. The simulation results show that the maximum and minimum errors of the calculated and actual switching losses are 9.55% and 1.29% respectively. The maximum errors of the experimental results and the theoretical values are less than 10%, which shows that the analytical expressions are more accurate.
原景鑫, 朱俊杰, 聂子玲, 叶伟伟, 贾英杰, 董蕾. 基于脉冲跳变SVPWM的单相中点钳位型H桥级联逆变器开关损耗解析计算[J]. 电工技术学报, 2020, 35(23): 4877-4887.
Yuan Jingxin, Zhu Junjie, Nie Ziling, Ye Weiwei, Jia Yingjie, Dong Lei. Analytical Calculation of Switching Loss of Single-Phase Neutral Point Clamped H-Bridge Cascaded Inverters Based on SVPWM. Transactions of China Electrotechnical Society, 2020, 35(23): 4877-4887.
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2020, Vol. 35 
