弱电网不对称故障期间双馈风电系统动态稳定性分析  

Dynamic Stability Analysis of DFIG-based Wind Power System During Asymmetric Faults of Weak Grid

作　　者：姚骏[1] 孙鹏[1] 刘瑞阔 方欣 迟永宁 田新首 YAO Jun;SUN Peng;LIU Ruikuo;FANG Xin;CHI Yongning;TIAN Xinshou(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China;Institute of Science and Technology,China Three Gorges Corporation,Haidian District,Beijing 100089,China;State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems(China Electric Power Research Institute),Haidian District,Beijing 100192,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044 [2]中国长江三峡集团有限公司科学技术研究院,北京市100089 [3]新能源与储能运行控制国家重点实验室(中国电力科学研究院有限公司),北京市100192

出　　处：《中国电机工程学报》2021年第21期7225-7236,共12页Proceedings of the CSEE

基　　金：国家自然科学基金委员会-国家电网公司智能电网联合基金(U1966208);国家自然科学基金项目(51977019)。

摘　　要：弱电网严重不对称故障期间双馈感应发电机与电网之间的动态耦合作用增强,使得风电系统存在振荡失稳的风险。为探索其振荡失稳机理,该文首先建立考虑控制器动态的双馈风电系统复频域阻抗模型。根据阻抗模型的输入输出特性,详细描述双馈风机和电网正负序阻抗之间的动态相互作用关系。并采用广义奈奎斯特判据综合评估不同因素对弱电网不对称故障期间双馈风电系统动态稳定性的影响规律,为故障过程中控制器带宽的选择提出建议。最后,通过仿真和实验验证理论分析的正确性。The dynamic coupling between the doubly fed induction generator(DFIG)and the power grid is strengthened during the severe asymmetric fault of weak grid,which makes the wind power system have the risk of oscillation instability.To explore the oscillation instability mechanism,the complex frequency domain impedance model considering the controller dynamic was derived.Based on the input-output characteristics of impedance model,the dynamic interaction between the positive and negative sequence impedances of the DFIG-based wind turbine and power grid was described.Moreover,the influence of different factors on the dynamic stability of system during weak grid asymmetric fault was investigated by the generalized Nyquist criterion.The suggestions of controller bandwidth selection during fault were proposed.Finally,the correctness of theoretical analysis was verified by the simulation and experiments.

关 键 词：双馈感应发电机 弱电网 不对称故障 动态稳定 风电并网 

分 类 号：TM315[电气工程—电机]