摘要
随着电网的不断发展和新能源的接入,电力系统短路电流超标问题愈发显著,相对于其他限流方式,线路投切方式拥有更好的灵活性和经济性。针对线路投切限流方式中线路切断过多导致电网安全性降低的问题,提出一种考虑机组启停和线路投切的短路电流抑制方法。根据节点导纳矩阵和节点阻抗矩阵的物理关系以及节点自阻抗的物理意义,推导出投切线路和启停机组与短路电流之间的关系,避免导纳矩阵求逆环节中的非线性项近似误差,得到更为准确的短路电流显式表达方法;进而以综合考虑发电成本、机组启停和线路投切成本为目标,提出计及显式短路电流约束的电力系统日前优化调度混合整数线性规划模型。最后,使用IEEE30节点和118节点系统验证所提模型的有效性和通用性,而后与导纳矩阵求逆法对比证明短路电流显式表达模型的精确性,并给出考虑机组启停和线路投切的日前调度运行方案。
With the expansion of power grid and the integration of renewable energy, the problem of short-circuit current(SCC) has become more and more severe. As compared with other SCC limiting methods, transmission switching(TS)has better flexibility and economics. Considering that switching off too many lines would jeopardize system security,the paper proposed a SCC limiting approach based on commitment of units and TS. According to the physical meaning of self-impedance and relationship between admittance matrix and impedance matrix, the paper presented an explicit expression of SCC considering the impact of TS and CU. The expression did not induce any errors by avoiding the approximation of nonlinear terms in matrix inversion. A mixed integer linear programming(MILP) based power system day-ahead optimal scheduling model considering explicit short-circuit current constrains was proposed, while minimizing the cost of generators and TS. Finally, case studies on the IEEE 30-bus and 118-bus systems validated the effectiveness and scalability of the proposed model. Compared with the SCC calculated from the admittance matrix inversion method, the accuracy of the proposed SCC explicit expression can be validated. Moreover, a day-ahead power system scheduling with commitment of units and switching of transmission lines was obtained.
作者
华浩丞
刘天琪
何川
南璐
胡晓通
苏学能
HUA Haocheng;LIU Tianqi;HE Chuan;NAN Lu;HU Xiaotong;SU Xueneng(College of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan Province,China;State Grid Sichuan Electrical Power Company,Chengdu 610041,Sichuan Province,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第5期1724-1735,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(52007125)。
关键词
短路电流
节点自阻抗
线路投切
机组启停
混合整数线性规划
日前调度
short circuit current(SCC)
nodal self-impedance
transmission switching(TS)
commitment of units
mixed integer linear programming(MILP)
day-ahead scheduling
