考虑电力系统阻塞的电网充裕度评价

Power Network Adequacy Assessment Considering Transmission Congestion

通过研究市场环境下电网传输的新特点,定义了电网传输的不同状态。提出了衡量线路阻塞程度的指标,用于评价电网传输能力的不充裕性,并应用于电力系统的扩展规划和运行计划。基于蒙特卡罗方法建立了计算充裕度指标的模型,考虑各类不确定性因素,对IEEE-24节点系统进行了市场模拟和仿真计算,结果表明,所提指标能有效识别电网传输中的瓶颈。线路阻塞风险指标可评估输电阻塞的风险,在电网规划中可构成新的规划准则并为阻塞管理提供依据。

Previous researches on network adequacy mostly focused on the measurements of the system reliability caused by component failures, but under market environment impact of congestion on network adequacy must be considered. Through the research on new features of power network transmission under market environment, different states of power network transmission are defined. The indices to measure transmission line congestion are proposed to evaluate the inadequacy of network transmission capacity and apply in the expansion planning and operation schedules of power grid. Based on Monte Carlo method a model to calculate the adequacy indices is built. Considering various uncertainty factors, market simulation of IEEE 24-bus system and simulation calculation are performed, and results of simulation and calculation show that the proposed indices can effectively recognize the bottlenecks during transmission congestion. The line congestion risk index defined in this paper can be use to evaluate the risk of transmission congestion, and it is also available to constitute new criterion in the expension planning and to offer reference for congestion management.