At present, multi-level three-phase voltage source inverters are widely applied in high-voltage and high-power electronic equipment. To solve the problem of DC-side capacitor voltage imbalance during the operation of the traditional three-phase voltage source inverter, the inverter structure is optimized in this paper based on the space vector modulation switch DC power supply. The equivalent model of a multi-level three-phase voltage source inverter is estab-lished, the space vector modulation algorithm of the 60° coordinate is used to realize the space vector modulation, and the capacitor voltage balance algorithm is used to fully take into account the switching sequence between different vec-tors, thus realizing the capacitor current balance. Experimental results show that compared with the traditional method, the proposed method can modulate the multi-level three-phase voltage source inverter, the output line voltage waveform distortion rate is 0.18％, and the voltage fluctuation at the capacitor point can be controlled within 3 V, indicating that this method is superior to the comparison method and has a better application performance.
关键词
空间矢量调制开关/直流电源/多电平/三相电压源逆变器
Key words
Space vector modulation switch/DC power supply/multi-level/three-phase voltage source inverter
维普
万方数据