摘要
从间谐波产生的机理出发,提出一种分析电网间谐波的新方法——包络分解法。该方法的主要依据是:含间谐波的工频信号一定是非平稳工频信号,间谐波信息一定包含在工频信号的包络之中。该方法的关键步骤是:从工频信号中提取包络,对包络进行分解,按特定公式求出各次间谐波的频率、幅值。包络分解法排除了整次谐波频谱泄漏产生的虚假间谐波,基于Matlab的仿真表明,用于实际电网时它提供的间谐波信息更为真实、精确。
Based on the mechanism of interhamonics producing,a new algorithm,named envelope decomposition-based method,for interharmonic analysis of power system is presented.The proposed method is mainly based on the two points that power frequency signal containing interharmonics must be non-stationary;interharmonics parameters must be restored from the envelope of the power frequency signal.The key steps are that extracting the envelope from power frequency signal,then decomposing the envelope and finally calculating frequency and amplitude of each-order＇s interharmonic based on specific formula.The fake interharmonics caused by the spectral leakage of integral harmonics are avoided.MATLAB simulation verifies that the method is more accurate for interharmonics analysis in the real network.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2011年第6期29-33,共5页
Power System Protection and Control
基金
江苏省2005年科技攻关计划项目(BE2005064)
江苏省高校自然科学基金资助项目(08kjd470002)
江苏省2009创新基金'模块的研发'(BC2009241)
关键词
谐波分析
间谐波
非平稳信号
包络
频谱泄漏
harmonic analysis
interharmonic
non-stationary signal
envelope
spectral leakage
