CAJ | 학술논문

传统中点箝位型三电平 Z 源逆变器多为双直流电源结构,针对单直流电源电容分压式拓扑,介绍两种直通状态与中点电位的关系,分析双调制波载波脉宽调制(Double Modulation Wave carrier-based PWM,DMWPWM)原理,提出一种基于DMWPWM 的三电平 Z 源逆变器中点电位平衡控制方法.通过合理设计直通状态的插入位置,动态调节中间电压调制波,对中点电位进行反馈控制,在消除中点电位低频波动的同时有效抑制中点电位直流偏移,且不会增加逆变器开关损耗.仿真分析验证了所提出中点电位平衡控制方法的优越性.
전통중점겸위형삼전평 Z 원역변기다위쌍직류전원결구,침대단직류전원전용분압식탁복,개소량충직통상태여중점전위적관계,분석쌍조제파재파맥관조제(Double Modulation Wave carrier-based PWM,DMWPWM)원리,제출일충기우DMWPWM 적삼전평 Z 원역변기중점전위평형공제방법.통과합리설계직통상태적삽입위치,동태조절중간전압조제파,대중점전위진행반궤공제,재소제중점전위저빈파동적동시유효억제중점전위직류편이,차불회증가역변기개관손모.방진분석험증료소제출중점전위평형공제방법적우월성.
@@@@Conventional neutral point clamped (NPC) three-level Z-source inverters are commonly powered by two isolated DC sources. For a topology composed of a DC source and two cascaded capacitances, the relationship between two shoot through states and neutral-point potential is introduced, and the basic principle of double modulation wave carrier-based PWM (DMWPWM) is analyzed. A neutral-point potential control method of three-level Z-source inverter based on DMWPWM is proposed. The position of shoot through is designed rationally and the intermediate voltage modulation wave is adjusted dynamically. The feedback control method is adopted to control the neutral point potential, which eliminates the low-frequency oscillations of NP potential and restrains the DC offset effectively, and won’t increase the number of semiconductor commutations. The superiority of the proposed method is verified by simulation.