定子电流控制的双馈风机导纳建模与次同步振荡风险分析  

Admittance Modeling and Subsynchronous Oscillation Risk Analysis of DFIG-based Wind Turbine with Stator Current Control

作　　者：杜程茂 杜雄[1] 苏婧媛 樊丽娟 李鸿鑫 安宇 DU Chengmao;DU Xiong;SU Jingyuan;FAN Lijuan;LI Hongxin;AN Yu(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Chongqing 400044,China;Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen 440304,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]深圳供电局有限公司,广东省深圳市440304

出　　处：《电力系统自动化》2023年第13期159-167,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金重点项目(51937001)。

摘　　要：定子电流控制(SCC)具有参考电流不受双馈感应发电机(DFIG)参数漂移影响的优势。然而,SCC的双馈风机与串联补偿线路产生的次同步振荡会阻碍风电的安全消纳。针对这一问题,深入分析SCC-DFIG小信号传递规律,同时考虑直流母线动态、频率耦合以及控制动态特性的影响,建立了准确表征双馈风机频域特性的导纳模型。通过分析双馈风机全风速条件下的负电阻分布规律,提出一种全风速工况虚拟电阻控制策略。MATLAB/Simulink仿真结果表明,SCC较转子电流控制的双馈风机振荡风险更高,且随着SCC比例系数增大、风速减小,系统并网振荡风险增大,仿真验证了所提稳定控制策略在不同风速工况下次同步振荡抑制的有效性。Stator current control(SCC)has the advantage that the reference current is not affected by doubly-fed induction generation(DFIG)parameter drift.However,the subsynchronous oscillation caused by the DFIG-based wind turbine with SCC and series compensation line will hinder the safe accommodation of wind power.To address this problem,the small signal transfer law of SCC-DFIG is deeply analyzed.Then,considering the influence of DC bus dynamics,frequency coupling and control dynamic characteristics,an admittance model is established to accurately characterize the frequency domain characteristics of the DFIG-based wind turbine.By analyzing the distribution law of negative resistance of DFIG-based wind turbine under all the wind speed conditions,a virtual resistance control strategy for all wind speeds is proposed.The MATLAB/Simulink simulation results show that the DFIG-based wind turbine with SCC has higher oscillation risk than rotor current control.With the increase of SCC proportional coefficient or the decrease of wind speed,the oscillation risk of grid-connected system is greater.The effectiveness of the proposed stability control strategy for subsynchronous oscillation suppression under different wind speed conditions is verified by the simulation.

关 键 词：双馈风机 次同步振荡 定子电流控制 导纳模型 串联补偿 

分 类 号：TM614[电气工程—电力系统及自动化]