An Improve Synchronized Space Vector Modulation Strategy for Three-Level Inverter
Zhang Guozheng1, Chen Wei2, Gu Xin1, Li Xinmin1, Zhou Zhanqing2
1. School of Electrical Engineering and Automation Tiangong University Tianjin 300387 China; 2. School of Artificial Intelligence Tiangong University Tianjin 300387 China
Abstract：Due to the limitation of switching loss, the switching frequency of three-level traction inverter for high-speed railway and urban railway is usually low than 1kHz. If the inverter is operated in the medium and high frequency regions, the decrease of carrier ratio will lead to the increase of low-order harmonics in the output voltage, so synchronous modulation strategy should be adopted. The conventional strategy can only guarantee the synchronization and symmetry of the output waveform, and fails to further optimize the quality of the output waveform. As a result, the amplitudes of low-order harmonics in the output waveform are still high. The design rules of switching sequence for the synchronous space vector modulation (SVM) were deduced according to the restriction of synchronization, three-phase symmetry, half-wave symmetry and quarter-cycle symmetry. Then an alternative switching sequence set was established, and the optimal switching sequence was obtained by evaluating the weighted total harmonic distortion. Simulation and experimental results show that the proposed strategy can effectively improve the output waveform quality of traction inverter.
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2020, Vol. 35 
