The power component open circuit faults diagnosis method of a cascaded converter is mainly stud- ied. According to the output voltage signal features of a frequency-domain, an energy eigenvector was estab- lished by the means of a wavelet packet. Then fault pattern recognition of the cascaded converter was presen- ted using BP neural network. The result shows that wavelet packet neural network in the cascaded converter fault diagnosis has high feasibility and validity.%以级联式变频器为研究对象，重点研究功率器件开路故障的诊断方法．对变频器输出电压进行小波包分解，寻求变频器正常和故障情况下的输出电压频带能量的变化规律．选取输出电压能量变化大的频带能量值作为特征向量，利用BP神经网络进行故障诊断．研究结果表明，小波包神经网络在级联式变频器故障诊断中具有较高的可行性和有效性．
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