确定风电场群功率汇聚外送输电容量的静态综合优化方法

A Static Optimization Method to Determine Integrated Power Transmission Capacity of Clustering Wind Farms

风电大规模集中并网是实现风能大规模开发利用的重要途径。由于风电电源具有输出易变、能量密度低等特点,在进行风电外送配套输电系统的容量规划时,必须考虑风电功率整体波动特性的影响。对多个风电场汇聚成风电场群后的功率波动特性进行量化分析,以风电场群的持续出力曲线描述其变化规律;在此基础上,提出一种风电场群功率汇聚外送输电容量的静态优化方法,该方法综合考虑了诸如电网输电收益、输电工程建设成本以及可能的阻塞造成弃风损失等因素对风电外送输电工程综合收益的影响。算例表明该方法与以风电场群总装机容量来规划外送输电容量的方法相比,能够显著提高输电工程的综合效益。

As some wind energy enriched regions are away from load centers,especially in the North China,it is necessary to connect clustering wind farms into the main grid with high-voltage transmission lines.So the primary issue is to rationally determine transmission capacity of the transmission line.This paper presented a static optimization method for transmission capacity determination considering the low energy density characteristics of wind generation.In order to maximize the comprehensive benefits of the transmission project,the following factors have been taken into account such as the transmission benefit,transmission constructing costs as well as the congestion loss probably caused by a low transmission capacity.Example shows that the proposed method can achieve optimal transmission project benefit than the traditional one based on the total installed capacity.Meanwhile,the proposed method is an effective tool to determine transmission capacity for incorporating some 10 GW-class wind farms into main grid.