考虑风电-负荷特性的理论线损计算方法

Theoretical line loss calculation based on wind power-load characteristics analysis

风电出力的不确定性和波动性将增大配电网理论线损计算的误差,为此提出一种考虑风电-负荷特性的理论线损计算方法.通过选取的风电-负荷特征变量对风电-负荷特性进行Ward聚类,并基于聚类结果进行每一类的特征日选取及权重配置,再分别计算各特征日理论线损值并将通过加权求和得到的综合理论线损作为最终的配电网理论线损计算结果,最后以某个含风电的35 kV配电网为算例验证了所提方法的有效性.与传统的采用平均日负荷曲线法或日最大负荷法选取代表日进行理论线损计算的方法相比,所提方法的线损计算精度更高.

The uncertainty and the volatility of wind power would increase the calculation error of distribution network theoretical line loss. To solve this problem, a method that taking wind power-load characteristics into consideration to calculate the line loss is proposed. This paper selects wind power-load variables to cluster wind power-load characteristics by Ward method, and selects the representative days respectively and configures weights on every category based on the clustering results. And then the paper calculates the theoretical line loss values of every representative day and gets the comprehensive theoretical line loss through weighted sum, and treats it as the final calculation result of theoretical line loss of distribution network. Finally, a 35 kV distribution network with wind power is taken as an example to verify the effectiveness of the proposed method. Compared with the traditional method that calculates theoretical line loss by average daily load curve or daily maximum load method to select the representative days, the calculation accuracy of theoretical line loss of the proposed method is higher.