The Resonance Mechanism Low Frequency Oscillations Induced by Nonlinear Governor System
Many low frequency oscillation phenomenons cannot be interpreted by negative damping theory and the AnBao line low frequency oscillation is one of them. The oscillation mode of AnBao line is local mode of ShangAn power plant through analyzing by Prony and eigenvalue method separately. So singlemachine infinite bus system with PSS and AVR was set up using MATLAB to analyze the AnBao line low frequency oscillation. Simulation results indicate that the AnBao line low frequency oscillation cannot be reproduced by adjusting damping. Consequently, the resonance mechanism of low frequency oscillation was put up. When the disturbance frequency of prime mover power is near to natural frequency of power system, constant amplitude power oscillation will occur even if the damping is big enough. Finally, the cause of power disturbance is analyzed from the governor system of steam turbine. If the speeddroop of governing system is nonlinear in some running point, small speed deviation may result in highlevel control valve oscillation that can arouse low frequency oscillation of resonance mechanism.
Powersystem lowfrequencyoscillation negativedamping resonancemechanism controlvalve speed-droop
Xu Yanhui Zhang Jingbo
School of Electrical and Electronic EngineeringNorth China Electric Power UniversityBeijing, China Jiyuan Power Supply Company Henan Province Electric Power Corporation Jiyuan, China
国际会议
广州
英文
1-4
2011-05-13（万方平台首次上网日期，不代表论文的发表时间）