考虑转子磁链-电流环控制动态的虚拟惯量DFIG功频响应特性建模  

Active Power-frequency Response Modeling of Doubly-fed Induction Generator With Virtual Inertia Control Considering Rotor Flux-current Loop Control Dynamics

作　　者：李国庆[1] 刘先超 姜涛[1] 王长江[1] LI Guoqing;LIU Xianchao;JIANG Tao;WANG Changjiang(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,Jilin Province,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市132012

出　　处：《电网技术》2023年第12期4897-4905,共9页Power System Technology

基　　金：国家电网公司科技项目(5108-202299258A-1-0-ZB)。

摘　　要：含有虚拟惯量控制的双馈风电机组的频率响应特性受风电本体和控制环节等因素影响,该文提出一种考虑转子磁链-电流环控制动态的虚拟惯量双馈风电机组功频响应特性建模方法。首先,分析含虚拟惯量控制的双馈风电机组在受扰后的运行特性,基于小信号线性化方法分别建立风轮机、异步发电机及其轴系、转子侧功率环控制以及电流环控制的状态方程;基于定子磁链定向原理化简转子磁链-电流环线性化方程,利用状态方程建立考虑转子磁链-电流环控制的风电机组五阶闭环传递函数;通过频域法量化电流环作用的转子磁链频域响应,剖析所提模型与已有简化模型之间的区别,采用摄动理论分析电流环控制参数对所提模型有功功率-频率响应的影响。最后,在含双馈风电的5节点测试系统与某实际电力系统算例中对比时域仿真结果,结果表明:所提模型的功频响应精度高、适用性强。The frequency response characteristics of a doubly-fed induction generator(DFIG) with virtual inertia control are influenced by various factors,including the wind turbines and their control elements.An active power-frequency response model for the DFIG considering the dynamics of rotor magnetic flux and current loop is proposed in this paper.Firstly,this paper investigates the operational characteristics of DFIG with virtual inertia control when subjected to disturbances.Utilizing the small signal linearization technique,the state equations are formulated for the wind turbine,the asynchronous generator,the shaft system,the rotor-side power loop control,and the current loop control.Then,the linearized equations for the rotor magnetic flux-current loop are simplified based on the principle of stator flux orientation.Using the state equations,a five-order closed-loop transfer function for the wind turbine system is derived,accounting for the influence of rotor magnetic flux and current loop control.The impact of the current loop on the rotor magnetic flux frequency response is quantified through a frequency domain analysis.Furthermore,a comparative analysis is performed between the proposed model and the existing simplified models,and the perturbation theory is employed to analyze the effects of current loop control parameters on the active power-frequency response of the proposed model.Finally,the high response accuracy and strong applicability of the proposed model are demonstrated through the comparative time-domain simulations on the five-node test system with DFIG and an actual power system example.

关 键 词：双馈风电 小信号模型 转子磁链 电流环 虚拟惯量 控制参数 

分 类 号：TM721[电气工程—电力系统及自动化]