电力系统自动化2016，Vol.40Issue(8)：78-84,91,8.DOI:10.7500/AEPS20150622001
发电机叠加型低励限制对电力系统动态稳定影响机制
Influence Mechanism of Superimposed Type of Underexcitation Limiter in Generators on Power System Dynamic Stability
摘要
Abstract
The excitation regulator of generators in current power systems are widely equipped with superimposed type of underexcitation limiters(UELs),which have important impacts on the dynamic stability of power systems.But the mechanism has not been fully recognized.Based on an extended Heffron-Phillips model,the variation law of the new coefficient of the model with the change of UEL parameters and operation point is analyzed.The damping torque of generator is divided into four components by using the electromagnetic torque analysis method.They are damping torque provided by UEL,damping torque provided by power system stabilizer (PSS),the inherent damping torque of system and damping torque related to coefficient D .The impacts of UEL parameters on the various parts of the damping torques are deduced and analyzed in detail.The results indicate that UEL boundary line with a large slope may cause damping torque provided by UEL to become negative,and UEL will worsen the positive damping torque provided by PSS in the usual case of UEL parameters.A typical example of the simulation system further validates the conclusions proposed.关键词
低励限制/电力系统稳定器/叠加原理/阻尼转矩分析/扩展 Heffron-Phillips 模型Key words
underexcitation limiter(UEL)/power system stabilizer(PSS)/superposition principle/damping torque analysis/extended Heffron-Phillips model引用本文复制引用
丁建顺,王青,马世英,牛栓保,宋云亭,栗然..发电机叠加型低励限制对电力系统动态稳定影响机制[J].电力系统自动化,2016,40(8):78-84,91,8.基金项目
国家电网公司科技项目(XT71-15-059)。This work is supported by State Grid Corporation of China(No.XT71-15-059) （XT71-15-059）
