1.Power Dispatching and Control Center of China Southern Power Grid, Guangzhou 510623, China;2.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
This work is supported by China Southern Power Grid Company Limited (No. ZDKJXM20160001).
Some frequency oscillations occurred near the governor dead band in the test of asynchronous interconnection in Yunnan in China. To analyze this issue, a piecewise linear system model considering governor dead band is established. The effect of governor dead band on frequency stability is clarified through steady-state and dynamic behavior analysis. Research results show that the system may have no equilibrium point with step-response dead band and it will cause frequency oscillations near the dead band. Meanwhile, the stability of piecewise linear system is determined by the eigenvalue of the linear system corresponding to each frequency range, and the negative damping effect can also cause system frequency instability. Different frequency oscillations in the test are simulated by both the simplified system model and the actual model of Yunnan power grid.
CHEN Yiping,LI Chongtao,YANG Ruopu,et al.Analysis Method of Piecewise Linear Model for Frequency Oscillation in Asynchronous Power Grid of Yunnan in China[J].Automation of Electric Power Systems,2020,44(6):186-193.DOI:10.7500/AEPS20190729004Copy