二极管钳位型级联多电平逆变器新型SPWM研究

针对目前级联型多电平逆变器正弦脉冲宽度调制(sinusoidal pulse width modulation,SPWM)数字化实现问题,分析常规载波调制SPWM算法的工作原理,提出了一种基于脉冲编码与轮换的多电平SPWM调制策略。通过对正弦调制波的提取变换,进行单载波"量化"调制,并采用脉冲编码与轮换控制技术,对"量化"后的信号进行脉冲编码和脉冲轮换,均衡各逆变单元的输出电压与输出功率,以及单元内部电容电压。仿真结果表明,与同相层叠载波SPWM调制策略相比,该调制具有更好的控制效果和更小的计算量;另外,控制算法的消耗资源对比分析表明,所提的控制算法较常规的SPWM算法更节省硬件资源。

Novel SPWM for diode-clamped cascaded multilevel inverter

A novel sinusoidal pulse width modulation ( SPWM ) strategy was presented for diode-clamped cascaded multilevel inverter, based pulse encoding and rotation, which decreases controller’ s computation-al load and takes up much more memory space. The strategy converted the multi-carrier modulation into single carrier modulation by compression transformation sinuous waveform, which extracted in different lev-els. Based on pulse recoding and rotation control technology, the control strategy balances each inverter unit output voltage and power, and each capacitance voltage of inverter unit. Compared with phase disposi-tion carrier PWM, the simulation results were given in order to illustrate the efficiency of the proposed multi-level SPWM to achieve high-performance control of cascaded multilevel inverter, which is suitable for low resources system with lower calculation, lower hardware resource consumption.