CAJ | 학술논문

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.
급련형다전평역변기채용저압H교천련실현고압수출,기량호적수출전압여전류파형,사기재중고압변빈기중축점득도엄범적운용.이대급련다전평역변기적공제균채용쌍겁성다중재파수평이상공제,수요실시계산다중재파여조제파비교산생적다로PWM파,소이주공제기공작량교대,차용역산생교대적계산오차.제출료"준단겁성"다중재파수평이상공제,재파부위정겁성,차유일반주기위령전평,기가대대강저주공제기공작량여감소계산오차,실험결과증명료기교쌍겁성다중재파수평이상공제구유경호적수출전압파형화계동성능,기재급련형다전평역변기중불실위일충유효적공제방법.
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 controller's 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.