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中文摘要：
随着风电场联网规模的不断扩大,风电功率波动对电网影响愈加显著,风电场建模已成为一项重要研究课题。本文提出了用一台等值机来表征场内风电机组整体性能的风电场等值模型,该等值机组在等效风速作用下所产生的风电功率与所有机组输出功率相等,适用于含风电场的大规模电力系统仿真。构建了基于输出功率最大相关性原则的等效风速选取方法,提出了表征风电机组整体风能捕获特性的等效风能利用概念及其计算方法。以某装有58台双馈感应风电机组的风电场为例,进行风电场等值建模与风电场输出功率计算,通过与风电场实际输出功率误差分析,对所构建等值模型的有效性进行验证。该模型可以用于在给定风况下的风电场输出功率快速计算,适用于大规模风电场联网运行仿真评估。
英文摘要：
With the increasing scale of the integration of wind power into power grids,the influence of wind power fluctuation begins even more significant on the power system,and therefore the modeling of wind farms has become an important research topic.In this paper,a new equivalent model of wind farm is proposed to represent the collective behavior of all the generator units for large power systems simulations,instead of using a complete model of wind farms where all the wind turbines are modeled.The model proposed here is based on aggregating wind turbines into an equivalent wind turbine which receives an equivalent wind of the ones incident on the aggregated wind turbines and generates the same power as the sum of all the wind turbines.Among the possible wind combinations of all wind turbines,the wind which is the most relative with the output power of all the wind turbines selected as the equivalent wind,and the concept and the calculation method of wind energy conversion efficiency is also proposed.The equivalent model of a wind farm equipped with 58 doublyfed induction wind turbines is established using the method proposed here,and the output power of the wind farm is also calculated using the model and is compared with the actual value of the wind farm.The validity of the model is also verified.The proposed equivalent model can be used for fast calculation of the output power of wind farm with given wind conditions and suitable for large-scale simulation of.wind farm interconnection to power grids.
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