摘要
谐振接地系统发生单相接地故障时,故障线路与非故障线路的故障相暂态分量的频谱分布具有明显差别。近似熵作为一种衡量时间序列复杂度的方法,在非平稳信号分析方面具有独特的优势。据此探讨了近似熵(approximate entropy,Ap En)作为谐振接地系统故障选线判据的可能性与适用性。利用Matlab建立了故障仿真模型,考虑故障角、接地电阻、故障距离等故障条件,通过对含噪声环境、采样不同步以及不同消弧线圈补偿度等情况下的仿真,证明了近似熵作为一种选线判据的可行性。
When single-phase earth fault occurs in resonant earthed system,there are significant differences in spectrum distribution of fault phase current between fault line and non-fault line. Approximate entropy has its unique advantage in the non-stationary signals analysis as a way of measuring the complexity of time series. Then the possibility and applicability of using approximate entropy（ Ap En） as the criterion in resonant earthed system fault line detection is discussed. The fault model is built on the basis of Matlab. Fault conditions such as fault inception angle,grounding resistance and fault position are considered. Some factors such as noise,asynchronous sampling and different compensation degrees are also taken into account. Simulation results verify the feasibility of Ap En criterion for fault line detection.
出处
《电测与仪表》
北大核心
2015年第12期18-22,共5页
Electrical Measurement & Instrumentation
关键词
谐振接地系统
单相接地
故障选线
近似熵
resonant earthed system
single-phase earth fault
fault line detection
approximate entropy（Ap En）
