【摘要】 级联H桥多电平变换器由多个单元模块组成，故障发生率相对较高，采取容错运行控制可以有效提高系统的性能和可靠性。通过注入零序电压来增强变换器故障后输出能力的容错控制方法具有不增加额外成本、实现简单的优势，不同的实现方式所注入的零序电压值和基波分量值各不相同，但是过大的零序电压会在电机驱动中对电机轴承和绝缘产生较大的影响。针对该问题，探讨了1种包含三次谐波的零序电压注入方法，减小所注入零序电压的基波分量，从而减小注入的零序电压对电机运行的影响。通过仿真和10 kW七电平变换器样机实验，验证了所提出的容错控制策略的有效性。更多还原

【Abstract】 A cascaded H-bridge( CHB) multilevel inverter is composed of many unit modules, and the probability of failure is relatively high. The fault-tolerant operation can effectively improve the reliability and performance of a system. By injecting zero-sequence voltage to enhance the output capability after fault, the fault-tolerant control method has advantages of not adding any additional cost and simple implementation. As a result, it has attracted wide attention. The zero-sequence voltage value and fundamental component value injected by different implementation methods are different, and an excessive zero-sequence voltage will have a great impact on the motor bearing and insulation in the motor drive. Aimed at this problem, a zero-sequence voltage( containing third harmonic component) injection method is discussed to reduce the fundamental component of injected zero-sequence voltage, so as to decrease the influence of injected zero-sequence voltage on the motor operation. The effectiveness of the proposed fault-tolerant control strategy was verified by simulations and a 10 kW 7-level converter prototype.更多还原