双馈感应风力发电机的参数辨识分析  

Analysis on the Identification of Doubly Fed Induction Generator

作　　者：金宇清[1] 赵泽[1] 鞠平[1] 吴峰[1] 

机构地区：[1]河海大学能源与电气学院,南京210098

出　　处：《高电压技术》2011年第7期1700-1705,共6页High Voltage Engineering

基　　金：国家杰出青年科学基金(50725723)~~

摘　　要：双馈感应发电机(DFIG)是当前国内外风力发电机(WTG)的主流机型。要研究大规模风电并网对电力系统的影响,必须要有准确的风力发电机和风力发电场的模型及参数。关于模型结构目前已有较多的研究成果,但是有关获取模型准确参数的研究却极少。为此,研究了双馈感应风力发电机的模型参数的辨识方法。首先通过研究各个参数的轨迹灵敏度相位来判断其可辨识性,发现除定子电抗和转子电抗不可以同时辨识外,其它参数均可以唯一辨识。然后通过分析可辨识参数的时域、频域灵敏度大小以及灵敏度曲线的形状来判断辨识的难易度,确定需要重点辨识的参数为定子电阻、定子电抗、励磁电抗和转子电阻。最后设计了基于蚁群优化算法的双馈感应风力发电机参数辨识方法,在Matlab/Simulink环境中搭建了仿真系统并验证了该辨识方法的有效性。We focus on the parameter identification of doubly fed induction generator （DFIG} based wind turbine generator （WTG）. Firstly, the trajectory sensitivity analysis is used to make judgments about the identifiability of parameters. If the phases of sensitivity curves are not the same or reverse, the parameters are uniquely identifiable. By this theory, we find that the stator reactance and rotor reactance cannot be simultaneously identified, but the other parameters are uniquely identifiable. Secondly, the difficulty of identification which means the possibility of obtaining the accurate values o{ the parameters from the measurement data is analyzed. A parameter is easy to be identified if the sensitivities of both time-domain and frequency-domain are high. A parameter which has a high value only in the low frequency area of the frequency-domain sensitivity curve is relatively easy to be identified. It is found that the stator reactance, rotor reactance, and exciting reactance are easy to be identified; the stator resistance and rotor resistance are relatively easy to he identified; the inertial constant is difficult to be identified. According to the analysis of identifiability and the difficulty of identification, four key parameters including the stator resistance, stator reactance, exciting reactance, and rotor resistance are decided to be identified. Then, an ant colony optimization algorithm based identification method is designed. Finally, the correctness of the analysis and the efficiency of the identification method are validated by the simulation results obtained in Matlab/Simulink environment.

关 键 词：风力发电机(WTG) 双馈感应发电机(DFIG) 参数辨识 可辨识性 轨迹灵敏度 频域灵敏度 蚁 群算法 

分 类 号：TM315[电气工程—电机]