【摘要】 逆变器的安全性与可靠性是电力电子系统稳定运行的不可或缺的条件,而逆变器的故障大部分是由其中的开关元器件运行故障所引起的。本文以滞环电流控制的逆变器作为研究对象,提出了一种可适用于各种控制策略下的开路故障诊断方法。逆变器的开路故障会导致输出相电流畸变,可将此现象作为一个故障特征,并结合比较故障发生前后入相电流方向,实现在半个周期内对开路故障的诊断及定位。此外,该诊断方法既不需要获取系统控制信号,也不需要添加额外传感器。最后,通过dSPACE半实物实验平台,对所提出方法的有效性、可靠性及局限性进行了验证和分析。更多还原

【Abstract】 Security and reliability of inverter are an indispensable part in power electronic system. Faults of inverter are usually caused by switch elements’ operating fault. Taking the inverter with hysteresis current control as the research object, a universal open-circuit fault location method which can be applied to multiple control strategies is proposed in the paper. If the switch open-circuit fault happens in inverter, the output phase current will inevitably change, which can be used as a characteristic for diagnosis, combined with the comparison of phase-current direction before and after the fault occurrence, to diagnose and locate the open-circuit fault in a half cycle. Moreover, this method requires neither system control signals nor sensor. The validity, reliability and limitation of the fault location method in the paper are verified and analyzed through dSPACE-based experiment platform.更多还原