1.Key Laboratory of Wide-area Measurement and Control on Power System of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 611731, China;2.China Electric Power Research Institute, Beijing 100192, China;3.Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610072, China
Power system stabilizer (PSS) is an effective means to solve low-frequency oscillation, but it cannot provide effective positive damping to suppress the ultra-low frequency oscillations which occur in enriched hydropower interconnection systems. Based on the complex torque coefficient method, the mechanism of ultra-low frequency oscillations is analyzed and the feasibility of additional damping control is verified. By utilizing the sub-band control idea, a low-pass branch is added to the traditional PSS to expand the ultra-low frequency control section, and a new anti-ultra-low frequency oscillation of power system stabilizer (AULFOPSS) controller structure is constructed. Then， the robust set algorithm is proposed to set the frequency band and the control parameters considering the changes of the system operation conditions. Through the example test applied to a hydropower outgoing area of Sichuan Power Grid in China, it is verified that the additional damping control method can effectively suppress the ultra-low frequency oscillations generated in different operating conditions.
This work is supported by National Key R&D Program of China (No. 2017YFB0902000) and State Grid Corporation of China (No. 521999180001).
|||YI Jianbo, ZHANG Guozhou, LIU Min, et al. Control Mechanism and Strategy Verification of Stabilizer for Suppressing Ultra-low Frequency Oscillation[J]. Automation of Electric Power Systems,2020,44(8):192-199. DOI:10.7500/AEPS20190530013|