考虑噪声抗扰特性的配电系统可测试性设计研究

Research on Testability Design of Power Distribution System Considering Noise Immunity Characteristics

基于MOSFET的电力电子系统具备高可靠性的要求,故需要一种高精度的故障诊断方法。但实际产品中存在信号噪声严重、一致性差等不完善的情况,常规的故障诊断方法难以准确识别故障。为此,本文提出一种基于仿真的考虑抗噪性的批量产品测试性设计方法,首先通过FMEA确定元器件的软故障、硬故障模型,构建电路仿真模型;然后进行故障注入仿真,构造依赖矩阵,通过提取不同类型信号的抗噪特性,选择和优化测试点方案;最后以某供电所配电系统为例进行测试性设计方法研究,通过仿真和实验验证评估测试点的有效性。

Power electronic systems based on MOSFET require high reliability,so a high-precision fault diagnosis method is needed.However,in actual products,there are situations where signal noise is severe and consistency is poor,making it difficult for conventional fault diagnosis methods to accurately identify faults.Therefore,this paper proposes a simulation based design method for batch product testability considering noise resistance.Firstly,the software and hardware fault models of components are determined through FMEA,and a circuit simulation model is constructed.Then conduct fault injection simulation,construct a dependency matrix,extract the anti noise characteristics of different types of signals,and select and optimize test point schemes.Finally,a testability design method was studied using the distribution system of a certain power supply station as an example,and the effectiveness of the test points was evaluated through simulation and experimental verification.