基于主元分析优化的光伏逆变电路故障诊断

Fault Diagnosis on Photovoltaic Inverter Based on Principal Component Analysis

最近几年,多电平逆变器的作用愈来愈明显,尤其体现在大功率变频电机调速驱动、并网发电,静止无功补偿装置等大功率高电压领域,中性点箝位型三电平逆变器获得了最普及的应用,它效率高,开关耗损小,输出电压质量好。本文针对三电平逆变器功率管开路,在分析其故障诊断方法后,可提高系统的安全可靠性。对仿真实验中采集到的输出电压信号利用主元分析优化法进行处理,利用主元分析优化算法经过矩阵变换、降低维数从而提取输出电压的特征参数,得到各个故障条件下的主元分析优化结果,得到引起三电平逆变器开路故障的主导因素。

In recent years,multi-level inverters have played an increasingly important role in high-voltage and high-power fields such as grid-connected power generation,high-power variable-frequency speed-regulating motor drives,and static reactive power compensation devices.Among them,neutral-point clamp type III Level inverters are the most widely used,and they have significant advantages such as low switching loss,high efficiency,and high output voltage waveform quality.In this paper,aiming at the open circuit problem of three-level inverter power tube,the fault diagnosis method is studied to improve the safety and reliability of the system,which has good theoretical research and engineering application value.The output voltage signal collected in the simulation experiment is processed by principal component analysis method.The principal component analysis algorithm is used to transform the matrix and transform the dimension to extract the characteristic parameters of the output voltage.The principal component analysis results under various fault conditions are obtained,and the dominant factor causing the open fault of the three-level inverter is obtained.