风电并网系统可用输电能力的评估

Assessment on Available Transfer Capability of Wind Farm Incorporated System

可用输电能力(available transfer capability,ATC)是衡量电力系统两点(区域)间可用来进一步可靠传输电能的能力。随着风力发电技术的快速发展和电力市场的逐渐成熟,迫切需要研究大型并网风电场对系统ATC的影响。利用时间序列模型描述风电场风速和输出功率,进而采用序贯蒙特卡罗仿真的方法对包含风电场的ATC进行概率评估;每一抽样状态的ATC采用关键约束下的交流潮流方法来计算;结合期望值和方差及相应的年度化指标评估风电场对ATC的影响。利用包含风电场的改进IEEE-RTS79系统进行仿真和算法验证,表明所提算法能快速而准确地计算ATC,并能有效评估风电场对ATC的影响,研究成果可为电力系统的运行和风电场的规划提供有益的参考。

Available transfer capability （ATC） is used to measure the further reliable power transfer capability between two nodes （or areas） in power system. With the rapid development of wind power generation and gradual maturity of power market, the research on large-scale wind power penetration on ATC has been an urgent need. Under the chronological model of wind speed and wind farm’s power output, ATC incorporated with wind farm is evaluated based on sequential Monte Carlo simulation. ATC determination of every sample state is calculated by key factor constrained AC power flow method. Expectation and variance and corresponding annualized indices are used to evaluate the impacts of wind farm on ATC. Simulation is employed on the modified IEEE-RTS79 system involving wind farm, the results show the proposed algorithm with the merits of fast and accurate calculation. The research could be a valuable reference to power market operations and wind farm planning.