附加频率控制双馈风电场频率响应特性建模与参数辨识

Frequency Response Modeling and Parameter Identification of Doubly-Fed Wind Farm with Additional Frequency Control

随着风电渗透率的增加,风电机组参与电力系统调频已成为间歇式风电消纳的共识。为实现含高比例风电电力系统频率特性的高效准确分析,该文首先建立了附加频率控制下双馈异步风电机组(DFIG)双输入(风速、频率)-单输出(并网功率)频率响应模型,并通过劳斯近似,依次建立了DFIG频率响应4阶和2阶模型;进而针对双馈风电场整体频率响应特性的建模需求,结合矩阵束法和最小二乘法,设计了采用数据重构的双馈风电场频率响应降阶模型参数辨识算法;最后,基于DFIG单机并网系统和含双馈风电场的扩展IEEE 30节点系统,通过对比Matlab/Simulink电磁暂态仿真结果,分别验证了频率响应降阶模型和所提参数辨识算法的准确性和有效性。

With the increasing penetration of wind power into power system, wind turbines participating in frequency regulation has become a consensus for wind power consumption. In order to realize the efficient and accurate analysis of frequency response characteristic in power system with high proportion wind power, the paper firstly establishes the double input(the wind speed and frequency) and single output(the grid-connected power) frequency response model of doubly-fed induction generator(DFIG). Then by using Routh approximation method, the fourth-order and second-order reduction models of DFIG frequency response are sequentially derived. Furthermore, to satisfy the need of building the frequency response model for doubly-fed wind farm, a parameter identification algorithm for the frequency response characteristics of doubly-fed wind farm is designed by combining matrix pencil method and least square method. Finally, the test results based on the DFIG gridconnected system demonstrate the accuracy of the derived frequency response reduce-order model. The effectiveness of parameter identification method is verified by comparing the electromagnetic transient simulation results of MATLAB/Simulink in DFIG grid-connected system and modified IEEE 30 node system with wind farm.