基于背靠背变流器互联的多微网主动配电系统有功-无功鲁棒协同优化运行策略  

Active-reactive Power Robust Collaborative Optimization Strategy for Active Distribution System With Multi-microgrids Based on Back-to-back Converter Interconnection

作　　者：郑舜玮 廖凯[1] 杨健维[1] 张怀远 何正友[1] ZHENG Shunwei;LIAO Kai;YANG Jianwei;ZHANG Huaiyuan;HE Zhengyou(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756

出　　处：《电网技术》2023年第12期5005-5014,共10页Power System Technology

基　　金：国家重点研发计划项目(2022YFB2603100);四川省自然科学基金项目(2022NSFSC0271)。

摘　　要：为解决微网发用电不确定性及并网功率因数限制给多微网主动配电系统带来的运行调度难题,以基于背靠背变流器互联的多微网主动配电系统为研究对象,提出一种计及功率因数约束的有功-无功鲁棒协同优化运行策略。首先,计及并网功率因数约束影响,对基于背靠背变流器并网的微网有功-无功调节特性进行分析;其次,综合考虑微网发用电不确定性及并网功率因数约束,建立min-max-min结构的有功-无功鲁棒协同优化运行模型,并基于二阶锥松弛法将所建立模型转化为混合整数二阶锥规划问题;然后,为解决所提模型第二阶段max-min中含有0-1整数变量导致无法直接利用KKT条件转对偶求解的问题,提出基于双层列生成算法的求解方法,并给出相应的加速策略以保证算法的快速求解;最后,基于改进的含3微网IEEE-33节点系统对比仿真验证所提策略的有效性及优越性。仿真结果表明,所提策略能够在“最恶劣”运行场景下,通过协调系统有功无功出力,有效保障微网并网功率因数运行在要求范围之内,并实现多微网主动配电系统运行成本最优运行。To solve the scheduling problems caused by the uncertainties of microgrids (MGs) and the power factor limitation of grid-connected MGs,an active-reactive power robust collaborative operation strategy considering the power factor constraint and uncertainties is proposed for the active distribution system with multi-microgrids.Firstly,considering the influence of grid-connected MG power factor constraint,the active and reactive power regulation characteristics of a microgrid based on the back-to-back converter are analyzed.Secondly,considering the MG uncertainties and the MG power factor constraint,an active-reactive power robust collaborative optimization operation model with a min-max-min structure is proposed.This model is transformed into a mixed integer second-order cone programming problem by the second-order cone relaxation method.Then,to solve the problem that the max-min problem can't be solved directly by using the KKT condition to dual because of 0-1 integer variables,a solving method is proposed based on the two-level column and constraint generation algorithm,and an acceleration strategy is given to ensure the rapid solution of the algorithm.Finally,the effectiveness and superiority of the proposed strategy are verified based on the modified IEEE-33 bus system with 3MGs.Simulation results demonstrate that the proposed strategy can effectively ensure the MG power factors within the required range and minimize the system operation cost by coordinating the active and reactive power output of the active distribution system in the"worst"operation scenario.

关 键 词：微电网 主动配电网 多微网主动配电系统 有功-无功协同优化 鲁棒优化 功率因数约束 

分 类 号：TM721[电气工程—电力系统及自动化]