摘要
N-1最大供电能力(total supply capability,TSC)是评估配电网的重要指标。该文提出TSC判定定理并证明。定理1:每回馈线均能找到与其具有转带关系的一回馈线/馈线段,使两者负荷互补;且N供一备和不对称分段联络接线的备用馈线负荷最小,对称分段联络接线由同一馈线提供备用的馈线段负荷相等。定理2:任意馈线N-1后,所有与故障馈线相联络馈线都满载。定理3:冗余量最小。冗余量是由严格边界等式约束得到的冗余式的取值。这3个定理分别从N-1前负载特征、N-1后负载特征和数学模型的不同角度进行判定。该文证明以上3个定理,并采用我国常见接线模式和配电网算例验证;进一步给出定理的应用举例。判定定理是TSC理论体系的一个基础性工作。与现有研究相比,判定定理提炼出了TSC点的负荷分布特征,能方便地确定所有达到TSC的系统状态,为规划运行中优化负荷分布提供方向,便于发挥配电网的供电能力。
N-1 total supply capability(TSC)is an important index for evaluating distribution network.This paper proposes and proves the TSC judgment theorems.Theorem 1:each feeder can find a feeder/feeder segment that has a transfer relationship with it,so that the loads of the two are complementary;and the load of backup feeder in N-supplyone-backup mode and asymmetry multiple-section-and-tie mode is the smallest,and the load of feeder segments with backup provided by the same feeder is equal in the symmetry multiple-section-and-tie mode.Theorem 2:after any feeder N-1,all feeders connected with the fault feeder are fully loaded.Theorem 3:redundancy is the smallest.Redundancy is the value of redundancy formula obtained by strict boundary equality constraints.These three theorems are judged from different angles of load characteristics before N-1,load characteristics after N-1 and mathematical model.Above three theorems are proved in this paper,and verified by typical wiring modes in China and distribution network case.Furthermore,an example of the application of the theorem is also given in this paper.Judgment theorem is a basic work of TSC theory system.Compared with existing research,judgment theorems abstract the load distribution characteristics of TSC points,which can easily determine all the system states reaching TSC,provide a direction for optimizing load distribution in planning and operation,and give full play to the power supply capability of distribution network.
作者
肖峻
蔡仲伟
XIAO Jun;CAI Zhongwei(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),NanKai District,Tianjin 300072,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第24期9481-9495,共15页
Proceedings of the CSEE
基金
国家自然科学基金项目(51877144)。
关键词
N-1最大供电能力
配电网
判定定理
负荷分布
N-1 total supply capability
distribution network
judgment theorem
load distribution
