双馈风电场等值准确度研究

Research on Equivalent Accuracy of Wind Farm Composed of DFIGs

为衡量双馈风电场等值的效果,提出一种双馈风电场等值准确度的评价方法。该方法基于直接距离法、规范系数法和模糊层次分析法,分别从数值评价和趋势评价2个方面,对系统的不同状态和多个指标进行综合量化评估。首先利用与压降不变原理和等值损耗原理相结合的加权平均法,将变速恒频双馈风力发电机组和集电线路进行相应等值。然后分别搭建风电场的详细模型和等值模型,对风电场的等值准确度进行综合量化评估。所提出的方法不仅可以科学全面地评价模型的等值准确度,还可以根据评价结果对等值模型进行修正,以提高风电场的等值精度。

To measure the effect of the equivalence of wind farm composed of double fed induction generators（DFIGs）, a method to assess the accuracy of equivalence of such a kind of wind farm is proposed. Based on direct distance method, standard coefficient method and fuzzy analytic hierarchy process（AHP）, from two aspects of numerical evaluation and trend evaluation the proposed method performs synthetic quantitative evaluation on different states and multi indices of the wind farm. Firstly, utilizing the weighted average method combining the principle of constant voltage drop with the principle of equivalent power loss, the equivalence of the variable speed constant frequency doubly fed wind power generation units and the collector system are correspondingly carried out. And then the detailed and the equivalent model of the wind farm are constructed respectively to conduct syn-thetic and quantitative evaluation on the equivalent accuracy of the wind farm. Using the proposed method, the equivalent accuracy of the wind farm can be reasonably evaluated, besides, according to the evaluation result, the equivalent model can be modified to improve the equivalent accuracy of the wind farm.