Narrow Pulse Suppression for Ultra Sparse Matrix Converter
Shi Tingna1,An Shaobo1,Yan Yan1,Xia Changliang1,2
1. School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China; 2. Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic University Tianjin 300387 China
Abstract:Limited by the property of switching devices, lots of narrow pulses are generated in the conventional space vector modulation of ultra sparse matrix converter (USMC), which will cause nonlinear distortion of the output waveform. Aiming at this condition, the causes that generating narrow pulses were analyzed and a narrow pulse suppression method was developed after improving the conventional modulation strategy. With the improved strategy, the order of active vectors in rectifier stage was rearranged after comparing the magnitude of duty cycle of each vector, which could avoid the losing of active vectors. At the same time, suitable zero space vectors were placed in the modulation of inverter stage to increase the width of pulses, which could reduce the number of narrow pulses. This strategy not only can effectively suppress the nonlinear distortion caused by narrow pulses, which can optimize the input-output performance of USMC, but also easily to implement without additional hardware. The feasibility and effectiveness of the proposed method are verified by experimental results.
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