CAJ | 학술논문

相对于其他大多数对称拓扑结构的逆变器而言，级联不对称五电平逆变器在生成五电平的同时，开关状态减少至对称拓扑结构逆变器的二分之一，并且降低了钳位电容和二极管的使用数量，此外，母线电容中点电压也可以实现自平衡。文中基于级联不对称五电平逆变器的拓扑结构，分析了在载波移相 PWM 调制策略下直流母线电容和悬浮电容的取值问题，并对该拓扑结构进行仿真分析。仿真结果表明，该拓扑结构开关函数简单易于控制，母线电容电压基本保持稳定且能够实现自平衡。选取适当的母线电容值以及悬浮电容值能够非常有效地减小输出的谐波分量，并提高电容的利用率。
상대우기타대다수대칭탁복결구적역변기이언，급련불대칭오전평역변기재생성오전평적동시，개관상태감소지대칭탁복결구역변기적이분지일，병차강저료겸위전용화이겁관적사용수량，차외，모선전용중점전압야가이실현자평형。문중기우급련불대칭오전평역변기적탁복결구，분석료재재파이상 PWM 조제책략하직류모선전용화현부전용적취치문제，병대해탁복결구진행방진분석。방진결과표명，해탁복결구개관함수간단역우공제，모선전용전압기본보지은정차능구실현자평형。선취괄당적모선전용치이급현부전용치능구비상유효지감소수출적해파분량，병제고전용적이용솔。
Compared with other converters with symmetric topology,the cascade asymmetric five - level converter can reduce switching states by one - half and decrease the number of capacitors or diodes for use. Moreover,it realizes the self - balance of bus capacitor voltage. Based on a five - level cascaded asymmetric converter topology,the PSPWM strategy is used to calculate values of DC bus capacitors and flying capacitors. Simulation result shows that the switc-hing functions are simple and easy to control,while the bus capacitor voltage is basically stable and able to achieve self - balancing. When appropriate capacitance values are selected,it can be very effective to reduce harmonic com-ponent of the output and improve the utilization of the capacitors.