基于谱聚类与功率传输分布因子的电网静态等值

Power System Static Equivalence Based on Spectral Clustering and Power Transfer Distribution Factors

大规模互联电网结构复杂,不便于大电网优化分析计算。传统电网等值方法不适用于构建基于全网的等值模型,为降低电力网络复杂度,建立大规模电网等值模型,提出基于谱聚类与功率传输分布因子的电网等值方法。首先,以功率传输分布因子为相似性测度,考虑节点间的连通性,基于规范化谱聚类算法对电网进行合理分区。其次,根据分区结果,计及关键线路输电能力约束,通过母线聚合技术对电网结构进行简化等值,构建等值模型,并以保证区间潮流交换准确性为目标计算等值模型参数。最后,给出了基于等值模型的区域电价计算方法,并通过算例验证等值模型计算准确性。

Simulation of large-scale interconnected power grids is relatively complex.A power system reduction method based on spectral clustering and PTDF is proposed in this paper to reduce complexity of power network and build large-scale equivalence mode of power grid due to that traditional equivalence method of power grid is not suitable for constructing equivalence model of whole system.Firstly,the power transfer distribution matrix is selected as the similarity criteria,and normalized spectral clustering method is used to partition the system by considering connectivity between buses.Then based on the clustering result,the power network is equivalence through bus aggregation technique by considering the power flow limits of branches.In addition,the equivalence model is built,and its parameters are calculated with aim of guaranteeing the correctness of power flow transfer between regions.Finally,a model for calculating marginal zonal price is presented based on equivalence model,and the calculation accuracy is verified through case analysis.