中国电机工程学报2026，Vol.46Issue(3)：863-874,中插1,13.DOI:10.13334/j.0258-8013.pcsee.242215
功角摇摆与新能源低穿控制切换耦合诱导的同步机暂态功角多摆失稳机理
Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources
摘要
Abstract
After system disturbances,the rotor angle oscillation of synchronous machines may cause voltage fluctuations at adjacent grid connection nodes of renewable energy sources(RESs),periodically triggering low voltage ride-through(LVRT)control.The activation and deactivation of LVRT controls,in turn,affect the dynamics of the synchronous machine's rotor angle swing,leading to transient rotor angle instability risks.To investigate the impact of LVRT switching on rotor angle stability during subsequent swings,assuming the first swing is stable,this paper first establishes a transient stability analysis model for the RES and SYNs combined system.Then the analytic relationship between the rotor angle of synchronous machines and the voltage of RES grid connection points is derived to obtain switching conditions for LVRT control represented by state variables.Subsequently,the changes in transient energy of the synchronous machine during periodic LVRT switching are analyzed by the transient energy function method to reveal the mechanism of the synchronous machine's rotor angle multi-swing instability.Afterward,an assessment method for the conservative stability boundary of the switching system is proposed.Finally,the correctness of the theoretical analysis is verified through time-domain simulation.关键词
暂态功角稳定性/周期性失稳/新能源发电/低电压穿越控制/暂态能量函数Key words
transient rotor angle stability/periodic instability/renewable energy generation/low voltage ride through control/transient energy function分类
信息技术与安全科学引用本文复制引用
李秉芳,杨松浩,胡艺雯,郝治国,张宇博,赵明..功角摇摆与新能源低穿控制切换耦合诱导的同步机暂态功角多摆失稳机理[J].中国电机工程学报,2026,46(3):863-874,中插1,13.基金项目
国家电网有限公司科技项目(5100-202340815A-3-8-KJ).Science and Technology Project of State Grid Corporation of China(5100-202340815A-3-8-KJ). （5100-202340815A-3-8-KJ）
