基于Crowbar的DFIG低电压穿越控制方法研究  

Research on low voltage ride through control method of doubly-fed induction generators based on Crowbar

作　　者：史春飞 刘世林[1] SHI Chun-fei;LIU Shi-lin(Anhui Key Laboratory of Detection Technology and Energy Saving Devices,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学检测技术与节能装置安徽省重点实验室

出　　处：《陕西理工大学学报（自然科学版）》2019年第4期39-45,共7页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：安徽省高校优秀青年人才支持计划项目(gxyq2017013);安徽省教育厅自然科学重点项目(KJ2018A0121)

摘　　要：针对双馈风力发电机(DFIG)在电网故障期间面临的脱网问题,研究基于Crowbar电路的低电压穿越控制方法。首先,在分析电网电压跌落过程中DFIG暂态特性的基础上,对Crowbar电路进行阻值整定,得到最优的Crowbar阻值范围;其次,根据电网电压跌落状况下DFIG的暂态响应特性,提出了相应的Crowbar电路投切控制方法;最后,在MATLAB/Simulink上对双馈风电系统低电压穿越问题进行仿真研究。仿真结果证明了采取Crowbar电路的必要性与所提出的控制策略的可行性。Aiming at the off-grid problem faced by doubly-fed induction generators(DFIG)during grid faults,the low voltage ride-through control method based on Crowbar circuit is studied.Firstly,based on the analysis of the transient characteristics of DFIG in the process of voltage sag in power grid,the optimal range of Crowbar resistance is obtained by setting the resistance of Crowbar circuit.Secondly,according to the transient response characteristics of DFIG in the condition of voltage sag in power grid,the corresponding input of Crowbar circuit and the optimal range of Crowbar resistance are proposed.Secondly,according to the transient response characteristics of DFIG under grid voltage sag,the corresponding Crowbar circuit switching-in and switching-off control method is proposed.Finally,the low voltage ride-through problem of DFIG system is simulated in MATLAB/Simulink.The simulation results prove the necessity of adopting the Crowbar circuit and the feasibility of the proposed control strategy.

关 键 词：双馈风力发电机 CROWBAR电路 阻值整定 低电压穿越 

分 类 号：TM315[电气工程—电机]