基于下垂控制的微电网DG选址和功率分配方法研究  

Research on DG location selection and power sharing method of sag control microgrid based on MILP

作　　者：赵长军 周丽 司晓峰 张龙基 牛威如 董浩男 ZHAO Changjun;ZHOU Li;SI Xiaofeng;ZHANG Longji;NIU Weiru;DONG Haonan(State Grid Gansu Electric Power Company,Lanzhou 730030)

机构地区：[1]国网甘肃省电力公司,兰州730030

出　　处：《电力需求侧管理》2024年第4期23-29,共7页Power Demand Side Management

基　　金：国家自然科学基金(52167010)。

摘　　要：在基于下垂控制的微电网运行中,分布式发电机(distributed generators,DG)之间的无功功率共享是一个关键问题。造成无功功率共享不平等的原因包括馈电阻抗差异、负载差异以及DG在尺寸和位置上的不均匀分布。因此,提出一个适用于微电网的混合整数线性规划(mixed-integer linearprogramming,MILP)问题,旨在实现微电网之间的比例无功功率共享。首先,研究了DG的最佳尺寸和放置位置,对涉及的各种非线性项进行了线性化的详细讨论;之后,针对给定的负荷曲线,在这些DG上生成一天的提前调度;然后,为了更准确地建模负载,采用了实际的恒定阻抗-电流-功率(ZIP)负荷模型;最后,用所提方法在一个经过修改的33总线网络上进行测试,实验结果验证了所提出的规划和调度方法的准确性。Reactive power sharing among distributed generators(DG)is a key problem in droop control based microgrid operation.The causes of unequal reactive power sharing include feed impedance differences,load differences,and uneven distribution of DG in size and position.Therefore,a mixed-integer linear programming(MILP)problem for microgrids is presented to achieve proportional reactive power sharing among microgrids.Firstly,the optimum size and position of DG are studied,and various nonlinear terms involved are linearized in detail.Then a one-day advance schedule is generated on these DGs for a given load profile.After that,an actual ZIP load model is used to model the load more accurately.Finally,the proposed method is tested on a modified 33-bus network.The experimental results verify the accuracy of the proposed planning and scheduling methods.

关 键 词：下垂控制 微电网 损耗最小化 MILP优化 无功功率共享 重新配置 

分 类 号：TM714[电气工程—电力系统及自动化] TK018[动力工程及工程热物理]