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中文摘要：
随着风电场规模的日趋扩大，其随机变化功率对接入电网的影响也越来越受到重视。风电场并网的仿真研究中，通常将数十台甚至上千台风力发电机等值简化为由几台风电机组成的风电场模型。因此，如何在多方面因素的影响下建立符合实际情况的风电场等值模型极为重要。本文分析了风电场风速的实际状况，运用同调等值法，结合风速产生的尾流效应和时滞效应，对大型风电场中不同型号的双馈风力发电机（DFIG）进行了区域划分，将同一区域的风电机等值为一台风电机。最后，基于Matlab／Simulink仿真平台，验证了在不同风速情况、故障情况下的等值效果，证实了本文等值方法的正确性，为风电场并网研究提供了一种可靠的参考模型。
英文摘要：
With the increasing of wind farm＇ s scale, the influence of random variable power upon power grid has been more and more seriously. In general simulation study about wind farm, it is possible to simplify tens or even thousands of wind turbines into a few wind turbines with suitable dynamic equivalent model. Therefore, it is very significant to establish a suitable dynamic equivalent model for actual wind farm under the influence of various factors. This paper analyzes the actual situation of wind speed, and takes both wake effect and time-delay effect into consideration. Next, using coherency method, this paper divides DFIG （Doubly Fed Induction Generator） in largescale wind farms into different regions, and then makes the wind turbines within the same region equivalent to one. Furthermore, based on the Matlab/Simulink, the equivalent effect at different wind speeds and fault conditions is studied. Finally, the correctness of equivalent method is validated in this paper as to provide a reference model for researches on large grid connected wind farms.
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