摘要
低频振荡是威胁电网安全稳定运行的一个重要因素。传统的基于测量信号的低频振荡模态参数辨识方法难以在系统未发生明显振荡时准确的检测模态参数。提出了一种利用系统正常运行时的白噪声响应识别系统模态参数的方法。首先用自然激励技术从白噪声响应间接获取系统的脉冲响应,再用HHT法对脉冲响应函数进行分析,得到系统各阶模态的频率、阻尼比等模态参数。通过对四机两区系统的仿真分析和实际电网数据的计算验证了方法的有效性。
Low frequency oscillation has become one of the most serious problems threatening power system security. Conventional measurement-based modal parameter identification methods cannot work effectively when there is no ob- vious oscillation. A method using the white noise response of the system under normal operation to identify modal pa- rameters is proposed. The impulse response of the system is first obtained from the white noise responses u^ing the natural excitation technique, then the impulse response is analyzed with HHT method to obtain modal parameters in- cluding frequency and damping ratio. The validity of the method is verified with the simulation of four-machine two- area system and the analysis of practical power system measurements.
出处
《华东电力》
北大核心
2013年第5期991-994,共4页
East China Electric Power
基金
国家自然科学基金(51007043)
国家电网公司大电网重大专项资助项目(SGCC-MPL017-2012)
三峡大学硕士学位论文培优基金(2012PY33)~~
