级联多电平逆变器单元故障时的载波调制

Modulation of cascaded multilevel inverters with faulty cells based on carrier

给出了计算中性点移位参数的一般公式.这些公式可用于单元直流电压相等或不相等的级联多电平逆变器发生单元故障时的载波调制或空间矢量调制.给出了一般的不对称的开关频率最优载波移相脉宽调制(ASFOCPSPWM)方法.采用所提出的ASFOCPSPWM方法,可以大大提高级联多电平逆变器系统的可靠性.仿真结果验证了理论分析的正确性.

The neural-shift method was a control strategy for cascaded multilevel inverters under faulty cells bypassed. The general formulations for the calculation of the neural-shift parameters has been derived. With these perameters, the carrier-and space vector-based modulation can be implemented easily for both equal and unequal DC voltage cascaded multilevel inverter with faulty cells. The general Asymmetric Switching Frequency Optimal Carrice Phase Shift PWM (ASFOCPSPWM) method was presented. The presented ASFOCPSPWM method can greatly enhance the reliabity of cascaded multilevel inverter. The simulation results have shown the validity of the theoretical analysis.