基于小波分析的逆变电路故障诊断方法研究

摘要

针对逆变电路受到输入电压不稳定性等因素的影响时容易产生故障的问题,提出一种基于小波分析的逆变电路故障诊断方法.构建逆变电路的电压、电流和功率的输入/输出模型,确定电路故障的约束参量模型,构建逆变电路运行状态目标函数,对电路中的传输信息流采用小波分析方法进行特征提取,实现故障准确检测和诊断.测试结果表明,采用该方法进行逆变电路故障诊断的准确性较高,可靠性较好.%The inverter circuit may easily produce the fault caused by the influence of input voltage instability and other fac-tors;therefore a wavelet analysis based fault diagnosis method of inverter circuit is proposed. The input/output model of voltage, current and power of the inverter circuit is constructed to determine the constraint parameter model of circuit fault. The target function of inverter circuit operation state is established. The wavelet analysis method is adopted to extract the features of trans-mission information flow in the circuit,and realize the accurate fault detection and diagnosis. The test results show that the meth-od has high accuracy and reliability for fault diagnosis of inverter circuit.