论文部分内容阅读
介绍了一种应用于中高压变频调速装置的9电平输出电压源逆变器,逆变器的主电路由2种不同拓扑结构的逆变电路组成,分别使用不同参数的开关器件实现,可以综合利用阻断电压高的器件和开关速度快的器件的优点。分析了逆变器主电路的拓扑结构及特点,研究了主电路的开关模式后提出了一种基于载波调制的适合于任意电平数目混合逆变器的PWM(脉宽调制)算法,最后仿真研究了混合9电平逆变器在变速驱动场合中的应用,并验证了算法的有效性。对线电压的频谱分析表明,混合9电平逆变器有很好的输出波形,输出谐波含量少,在高频段输出线电压的总谐波畸变率小于5％,输出电压的dv/dt小,可用于驱动大容量的中高压异步电动机。
A 9-level output voltage source inverter applied to medium and high voltage frequency conversion speed regulation device is introduced. The main circuit of the inverter is composed of two kinds of inverters with different topologies, which are respectively realized by switching devices with different parameters. The advantages of high blocking voltage devices and switching speed devices can be combined. The topology structure and characteristics of the main circuit of the inverter are analyzed. After the switching mode of the main circuit is studied, a PWM (pulse width modulation) algorithm based on the carrier modulation is proposed, which is suitable for any level of hybrid inverter. The final simulation The application of hybrid 9-level inverter in variable speed drive is studied and the effectiveness of the algorithm is verified. The spectrum analysis of the line voltage shows that the mixed 9-level inverter has a good output waveform and a small output harmonic content. The total harmonic distortion of the output line voltage in the high frequency band is less than 5%, and the output voltage dv / dt Small, can be used to drive large-capacity high-voltage induction motors.