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Technical Lecture

Multilevel Inverters

T26.1 - An Approach to Compensate for Low Frequency DC-Link Voltage Ripple in High Power ANPC Inverter

Thursday, March 20, 2025
8:00 AM – 8:20 AM ET
Location: Level Three, A311
DC-Link Voltage ripple has an adverse impact on the performance of Electric Vehicle Traction Drives. Employing a large LC Filter may not be feasible in scenarios demanding high power density such as in Electric Vehicle Aviation Applications. In this paper, a new technique is discussed to compensate for the DC-link voltage fluctuation using a feedforward strategy to eliminate the impact of fluctuation. The proposed DC-link ripple rejection technique is combined with space vector PWM (SVPWM) method, and the dynamic performance is guaranteed by tracking voltage variation in real time. Simulation and experiment results on a 14kW SiC ANPC inverter are presented to verify the effectiveness of the proposed technique, which successfully compensates for a 10% DC-link fluctuation.