电力系统保护与控制2011，Vol.39Issue(15)：28-32,5.
基于SSI和LS的间谐波检测新方法
Novel method on interharmonics detection based on SSI and LS
摘要
Abstract
A novel method of high-accuracy detection for interharrnonics based on stochastic subspace identification (SSI) and least square technique (LS)technique is proposed. SSI is used for modal parameters identification of linear system in time-domain. Firstly, Hankel matrix is built by using the output data of system, then system matrix and output matrix of system state equation are separated, so system modal parameters (inherent frequency, damping ratio and mode shape of variation) are identified. Frequency, attenuation factor and amptitute ofinterharmonics can be detected by SSI and the automatic ranking of system can be realized based on the mode shape of vibration, and phases of each frequency component of interharmonics can be estimated based on LS furthermore. Numerically simulating signals of noise, fluctuating frequency and fluctuating amplitude, and variable-frequency-speed-regulation system's current are analysed based on SSI and LS, and contrasting to Prony method, high accuracy and anti-noise ability of the novel algorithm are represented by simulation results. This work is supported by Natural Science Foundation of Hunan Province (No. 07JJ6079).关键词
间谐波/随机子空间辨识/模态参数/最小二乘法/PronyKey words
interhannonics/ stochasitc subspace identification/ modal parameter/ least square technique/ Prony分类
信息技术与安全科学引用本文复制引用
金国彬,李天云,黄绍平,李玲,彭晓..基于SSI和LS的间谐波检测新方法[J].电力系统保护与控制,2011,39(15):28-32,5.基金项目
湖南省自然科学基金项目(07JJ6079) （07JJ6079）
湖南省教育厅资助科研项目(10C0550) （10C0550）
湖南省高校创新平台开放基金项目(09K100) （09K100）
