摘要
随着风电装机容量在电力系统中所占的比重不断增大,风电与电网的相互影响越来越复杂。异步电机作为双馈风电机组重要的发电设备,其暂态模型是否准确直接决定了系统的仿真精度。然而,PSCAD/EMTDC等电磁暂态仿真软件将异步电机数字封装,虽然模型精度高,但速度过于缓慢、用户无法获取电机内部结构,这限制了风电机组的仿真设计与优化加速。针对这一问题,提出了双馈异步风力发电机(Doubly-Fed Induction Generator,DFIG)的电磁暂态等效仿真模型,首先,基于abc/dq 0变换重构了发电机的数学方程,利用后退欧拉法对基本方程进行了离散化;其次,通过近似参数,将电机模型的导纳矩阵转为恒导纳矩阵,通过定转子系统的坐标反变换得到了发电机与外部电网络的直接机网接口;最后,在PSCAD/EMTDC环境中搭建了DFIG测试系统,多工况验证所提发电机模型的可行性,并利用最大相对误差和2范数误差分析方法进行了准确度分析。所提出的DFIG等效建模方法,可为大规模风电机组的电磁暂态模型设计和仿真加速提供模型基础。
As the proportion of installed wind power capacity continues to increase in the power system,the interaction between wind power and the grid is becoming increasingly complex.The asynchronous motor,as a crucial generation device in doubly-fed wind turbines,plays a vital role in determining the simulation accuracy of the system through the transient model.However,electromagnetic transient simulation software such as PSCAD/EMTDC digitally encapsulates the asynchronous motor.While this results in high model accuracy,it also leads to slow simulation speeds and restricts user access to the motor′s internal structure,thereby limiting the simulation design and optimization acceleration of wind turbines.Firstly,we reconstruct the mathematical equations of the generator based on the abc/dq 0 transformation,and discretize the basic equations using the backward Euler method.Secondly,by approximating the parameters,we convert the conductance matrix of the motor model into a constant conductance matrix,and obtain a direct grid-machine interface between the generator and the external power network through inverse coordinate transformation of the stator and rotor systems.Finally,we build a DFIG test system in the PSCAD/EMTDC environment to verify the feasibility of the proposed generator model under various operating conditions,and conduct the accuracy analysis using the 2-parameter error analysis method and the maximum relative error analysis method.The proposed DFIG equivalent modelling method can provide a model basis for the design and simulation acceleration of electromagnetic transient models for large-scale wind turbines.
作者
王焱
邹明
刘逸凡
许建中
冯谟可
贾秀芳
赵成勇
WANG Yan;ZOU Ming;LIU Yifan;XU Jianzhong;FENG Moke;JIA Xiufang;ZHAO Chengyong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《华北电力大学学报(自然科学版)》
北大核心
2025年第3期96-105,116,I0001,共12页
Journal of North China Electric Power University:Natural Science Edition
基金
国家自然科学基金资助项目(52277094).
