三电平逆变器容错拓扑的多载波控制策略

多电平逆变器由于具有不少相对于两电平逆变器的优势,在大功率等场合得到了大量应用,但是其复杂的拓扑结构也带来了故障概率比较大的缺点.在针对多电平逆变器的故障诊断和容错研究中,提出了不少新的容错拓扑,针对一种具有不对称桥臂的NPC逆变器容错拓扑进行控制技术的研究.该拓扑中同时具有两电平桥臂和三电平桥臂,提出两电平桥臂的三角载波和三电平桥臂的多载波之间的相位将会影响到电路的输出特性.当这两种载波同相位时,输出电压波形的谐波含量比较少,并进行了理论分析和实验验证.

Multi-Carrier Control Strategy for a Three-Level Inverter Tolerant Topology

Abstract： Since multi-level inverter has a lot of advantages over the two-level inverter, it is widely used in high power and other situation. However, its complex topology also brings a relatively large probability of failure problem. In studying on fault diagnosis and tolerant multi-level inverter, a lot of new fault tolerant topologies were proposed. Aimed at a NPC inverter tolerant topology with asymmetrical bridge, control strategies were studied in this paper. This tolerant topology has a two-level bridge and some three-level bridges. It is proposed that the phase between triangular carrier of the two level bridge and multi-carrier of three-level bridges will affect the output characteristics of the circuit. When both carriers are in the same phase, the harmonic content of the output voltage waveform is relatively small. The theoretical analysis and experimental results verified the effectiveness of the topology.