摘要
高比例风电接入背景下,配网优化重构是缓解弃风、失负荷问题的一种有效手段。多对象优化重构作为非凸非线性优化问题,同时含大量离散变量求解难度较大,为此建立了基于拓扑相似性的含高比例分散式风电配网双层交互式优化重构模型。模型设计了支路复介数相似度评价指标,来衡量所有辐射状拓扑的相似度,再将相似网络进行聚类,形成了重构层的树状解空间。重构层以分段/联络开关状态为决策变量优化网络拓扑结构,并传输至调度层;调度层以分散式风电出力、储能运行状态、无功补偿装置功率及需求响应量为决策变量,进行配电网有功无功协同优化调度,以确定各对象最优运行状态并反馈到重构层,两层不断交互迭代得出最终策略。为适应该模型提出了一种剪枝和声搜索算法,其中和声库从树枝切换到枝内的过程,提高了重构层网络重构的求解效率。采用IEEE 33节点系统仿真测试,验证了所提方法在提升系统电压安全性、降低系统运行成本方面的优越性。
Under the background of high penetration of wind power,optimal reconfiguration of the distribution network is an efficient way to address the issues of wind curtailment and loss of electricity.Multi-objective optimal reconfiguration is a non-convex nonlinear optimization problem containing many discrete variables,which is difficult to solve.Therefore,this paper establishes a bi-level topology similarity-based interactive reconfiguration method for a distribution network with high penetration of distributed wind power.A branch complex betweenness similarity evaluation index is designed to measure the similarity of all radial topologies for clustering similar networks and forming a tree-shaped solution space.The reconfiguration level optimizes the network topology with the states of the sectionalizing/tie switches as the decision variables which are transmitted to the scheduling level.The scheduling level carries out the coordinated active and reactive power optimal dispatch of the distribution network using the distributed wind power output,operation status of energy storage,power of reactive power compensation device,and demand response as decision variables.The optimized results of the scheduling level are fed back to the reconfiguration level,and the two levels continuously interact and iterate to come up with the final strategy.Furthermore,a pruning branch-harmony search algorithm is proposed to enhance the solution efficiency of the reconfiguration level network reconfiguration,in which the solution space can be switched from the branch to the intra-branch.The proposed method is benchmarked on the modified IEEE 33-node system,and the comparative results demonstrated its superiority in improving the system voltage security and reducing the system operation cost.
作者
张泽坤
杨洁
刘念
ZHANG Zekun;YANG Jie;LIU Nian(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)
出处
《电网技术》
EI
CSCD
北大核心
2024年第6期2436-2447,I0050,共13页
Power System Technology
关键词
配电网
分散式风电
拓扑相似性
双层优化重构
二阶锥规划
distribution networks
distributed wind power
topological similarity
bi-level optimal reconfiguration
second-order cone optimization
