直流高压ISOP型多电平逆变拓扑控制及对比分析

Control and Comparative Analysis of DC High Voltage ISOP Multilevel Inverter Topology

在输入直流电压较高的场合,考虑到逆变器的功率开关管耐压能力有限,采用了一种输入串联输出并联(ISOP)逆变器拓扑,由两个单相全桥逆变器模块组成,在输入均压控制下可以均分输入直流电压,使功率开关管只承受输入直流电压的1/2,并在载波移相正弦脉宽调制(SPWM)方式下输出电平数增加,从而可以降低输出电压的THD。此外,在谐波、扩展性等方面对比ISOP逆变器和有源中点钳位(ANPC)三电平逆变器,指出ISOP逆变器的优越性。最后进行了仿真验证。

When the input DC voltage is high,considering the limited voltage endurance capability of the power switch of the inverter,an input-series and output-parallel(ISOP)inverter topology was adopted,which is composed of two single-phase full-bridge inverter modules. The input DC voltage could be divided equally under the inputvoltage sharing control,so that the power switch could only bear half of the input DC voltage,and the output level quantity increases under the carrier phase shift sinusoidal pulse width modulation(SPWM)mode,which can reduce THD of the output voltage. In addition,the ISOP inverter and the active neutral point clamped(ANPC)three-level inverter were compared in terms of harmonics and scalability,and pointed out the superiority of the ISOP inverter.Finally,the simulation verification was carried out.