限制短路电流水平的220 kV电网规划方法

220 k V network expansion planning considering short-circuit current constraint

随着系统装机容量和负荷的不断增长,220 k V电网所面临的短路电流越限问题日益凸显。从网架结构规划上限制系统短路电流水平,既要考虑与上级500 kV相配合,避免电磁环网,分区分片运行;又要考虑对下级系统的供电可靠性,能够满足N-1原则。文章以系统阻抗矩阵出发,计及故障限流器及断路器遮断容量的优化配置,提出了考虑短路电流约束的双层网架规划模型及其相应求解方法,随后以华东某地区实际网架作为算例进行了2030年的网架规划,验证了所提出规划方法的可行性。

220 kV network is confronted with problems such as violation of short-circuit current constraints brought by increasingly installed generation capability and system load.For restricting the value of short-circuit current of power system,220 kV network needs to cooperate with 500 kV network in order to avoid electromagnetic coupled power loop thus to be operated in voltage-grading and district-dividing topology.Meanwhile,220 kV network is supposed to meet reliability restrictions based on N-1 principles to further ensure the responsibility as energy supplying system.Aiming at the limitation of short-circuit current,a bi-layer model of 220 kV network expansion planning with its corresponding solution algorithm considering the optimization of current limiting method is proposed in this paper.An actual study case of expansion planning in 2030 generated from eastern China power system is used to prove the feasibility of the mentioned methodology.