摘要
基于双馈感应发电机(DFIG)并网模型,首先分析电网短路故障后DFIG机端电压相位跳变特征;其次通过分析锁相环(PLL)在电压相位跳变下的暂态响应特性,揭示故障恢复后暂态过电压形成机理,并在此基础上,分析了考虑相位跳变时PLL锁相误差对风电机组低电压穿越特性的影响;最后根据故障恢复时刻电压相位跳变特性提出对转子侧变流器(RSC)以及锁相环的改进控制策略,实现风电机组对暂态过电压的主动抑制,提高风电送出系统的稳定性。
Firstly,based on the grid-connected doubly-fed induction generator(DFIG)model,this paper analyzed the phase angle jump characteristics of DFIG terminal voltage after grid short circuit fault.Then by analyzing the transient response characteristics of the phase-locked loop(PLL)under phase angle jump,the formation mechanism of transient overvoltage after fault recovery was revealed.On this basis,the influence of PLL phase-locked error on the LVRT characteristics of the wind turbines was analyzed.Finally,an improved control strategy for rotor-side converter(RSC)and PLL was proposed according to the voltage phase angle jump characteristics after fault recovery,which realized the active suppression of transient overvoltage by wind turbines and improved the stability of the wind power transmission system.
作者
刘其辉
吴勇
闫佳颖
吴林林
孙大卫
刘辉
Liu Qihui;Wu Yong;Yan Jiaying;Wu Linlin;Sun Dawei;Liu Hui(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;State Grid Jibei Electric Power Company Limited Research Institution,Beijing 100045,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第5期86-94,共9页
Acta Energiae Solaris Sinica
基金
国家电网有限公司科技项目(5100-202214502A-3-0-SF)。
