中国电机工程学报Issue(30)：5408-5415,8.DOI:10.13334/j.0258-8013.pcsee.2014.30.019
利用环境激励下的发电机组转子动态响应识别次同步振荡模态的方法
Real-time Identification of Subsynchronous Oscillation Modal Parameters Based on Dynamic Characteristics of Generator Rotors Under Ambient Excitation
摘要
Abstract
Through the real-time measurement of rotor speed of a running generator unit, which was a weak response signal excited by power grid load fluctuations and noises, the generator-grid oscillation modal parameters (modal frequecies, dampings and amplitudes) were recognized online. The random decrement characteristic signal including free damped response components of the generator-grid system structure oscillation was obtained through the application of random decrement technique (RDT) to the processing of the rotor angular displacement differential signal under ambient excitation. The time-domain attenuation characteristic curves of subsynchro- nous oscillation (SSO) components were obtained from the random decrement characteristic signal through the application of the narrow band pass filter algorithm, and then the vibration modal dampings at the specified frequencies under the current operation condition were calculated. This new scheme was used to analyze the measured data of a 1000MW generator unit in Suizhong power plant and identified the SSO modal parameters of the Suizhong power plant and Gaoling HVDC power grid effectively. Real-time subsynchronous oscillation safety monitoring can be realized based on this method.关键词
次同步振荡/模态阻尼/环境激励/发电机组/转子Key words
subsynchronous oscillation (SSO)/modal damping/ambient excitation/generator unit/rotor分类
信息技术与安全科学引用本文复制引用
李娟,杨远洪,焦邵华..利用环境激励下的发电机组转子动态响应识别次同步振荡模态的方法[J].中国电机工程学报,2014,(30):5408-5415,8.基金项目
国家自然科学基金项目(51147001)。Project Supported by National Natural Science Foundation of China (51147001)． （51147001）
