级联型多电平逆变器准单极性控制策略  

Quasi-unipolar Control Strategy for Cascaded Multi-level Inverter

作　　者：朱思国[1] 欧阳红林[1] 朱英浩[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电气传动》2009年第12期40-43,共4页Electric Drive

摘　　要：级联型多电平逆变器采用低压H桥串联实现高压输出,其良好的输出电压与电流波形,使其在中高压变频器中逐渐得到广泛的运用。而对级联多电平逆变器的控制均采用双极性多重载波水平移相控制,需要实时计算多重载波与调制波比较产生的多路PWM波,所以主控制器工作量较大,且容易产生较大的计算误差。提出了"准单极性"多重载波水平移相控制,载波仅为正极性,且有一半周期为零电平,其可大大降低主控制器工作量与减小计算误差,实验结果证明了其较双极性多重载波水平移相控制具有更好的输出电压波形和启动性能,其在级联型多电平逆变器中不失为一种有效的控制方法。Cascaded multi-level inverter with low voltage H-bridge in series to achieve high-voltage output is gradually widely used in the high-voltage inverter because of its good output voltage and current waveforms. Most of them are controlled by the way of bipolar multiple levels of carrier phase-shift. Because it needs to compute the multi-channel PWM wave in real-time which is compared by multiple-carrier and modulation wave, the main controller has large workload and is easy to have a greater calculation error. A＂quasi-unipolar＂ multiple levels of carrier phase-shift control with only polarity carrier and half-cycle zero level was presented which can greatly reduce the main controllerrs workload and the calculation error. Experimental results show that it has better output voltage waveform and starting performance than bipolar phase shifter, so it may be an effective control method in cascaded multi-level inverter.

关 键 词：级联型多电平逆变器 多重载波水平移相 双极性 准单极性 

分 类 号：TM921.52[电气工程—电力电子与电力传动]