摘要
传统的时频分析方法在处理复杂故障信号时存在一定的局限性,无法满足电力系统发生故障和复杂扰动时的电力信号实时分析的需求。提出基于Hilbert-Huang变换(HHT)的电能质量暂态多扰动信号分析方法,先利用经验模态分解得到电能信号的固有模态函数,再对固有模态函数进行HHT变换,准确刻画电能扰动信号的时间、幅值与频率。Matlab仿真分析结果表明,该方法可有效确定干扰信号的类型、持续时间以及瞬时频率和幅值,方法简便,分析精度高,具有一定的工程实用价值。
Traditional time-frequency analysis method has some limitations in the complex fault signals processing,and is unable to satisfy the requirement of real-time signal analysis in large power system disturbances and faults.In this paper,Hilbert-Huang Transform（HHT）was used to analysis the transient disturbance signal of power quality.Firstly,the signal was decomposed into Intrinsic Mode Function（IMF）by the EMD.Then amplitude and frequency of corresponding time could be detected accurately and quantitatively.Matlab based simulation results showed that this method could effectively determine the type,lasting time,simultaneous frequency and amplitude of disturbances.The proposed method is simple and has high accuracy,which can be used in practical power system.
出处
《电力科学与技术学报》
CAS
北大核心
2016年第1期55-61,共7页
Journal of Electric Power Science And Technology
基金
宜昌市科技研究与开发项目(A15-302-a12)
