摘要
分析研究风电接入后系统的动态运行与稳定控制,需要建立准确的风电机组结构和参数模型。为此,根据系统辨识理论,推导双馈风电机组(DFIG)的传递函数矩阵,构造传递函数系统与未知参数之间的关系,分析风电机组电抗参数的可辨识性;对风电并网系统进行动态轨迹保稳降维等效变换,通过分析系统主导映像轨迹的特征,建立双馈风电机组参数识别系统的受扰轨迹差异度指标,并将参数待识别系统受扰轨迹与实际轨迹的差异度作为目标函数,优化求解双馈风电机组电抗参数;对算例系统发生线路故障和风速变化等不同情况下进行参数识别计算。仿真结果检验了采用系统轨迹差异度方法识别DFIG参数的有效性和可行性。
When investigating dynamic operating characteristics of power systems with large scale wind power integration, accurate models for structures and parameters of wind power generators are needed. Based on system identification theory, the transfer function of the double-fed induction generators （DFIG ） is derived, then the relationship between the unknown parameters and the transfer function system is constructed to analyze the identifiability of the DFIG’s parameters. The equivalent transform of reduced dimension is imposed on the DFIG-integrated system, and by analyzing the dominant image trajectory characteristics, the index of trajectory difference degree is proposed, which can be designed as an objective function to optimize the solutions to DFIG reactor parameters. Finally, some simulations are conducted with consideration of different line faults and changes in wind speed to further validate the effectiveness and feasibility of the proposed method of parameter identification for DFIGs.
出处
《中国电力》
CSCD
北大核心
2013年第7期100-104,共5页
Electric Power
基金
中国博士后基金资助项目(20100481153)
江苏省博士后基金资助项目(1002038C)
关键词
双馈风电机组(DFIG)
稳定计算
轨迹特征
参数识别
double-fed induction generator （DFIG）
stability calculation
trajectory characteristics
parameter identification
