计及功率裕度的FDN模糊下垂控制策略研究  

Research on FDN Fuzzy Droop Control Strategy Considering Power Margin

作　　者：刘玉洁 袁旭峰[1] 班国邦 徐玉韬 辛晓云 吴舟 LIU Yujie;YUAN Xufeng;BAN Guobang;XU Yutao;XIN Xiaoyun;WU Zhou(Electrical Engineering College,Guizhou University,Guiyang 550025,China;Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)

机构地区：[1]贵州大学电气工程学院,贵州贵阳550025 [2]贵州电网有限公司电力科学研究院,贵州贵阳550002

出　　处：《电力科学与工程》2021年第3期8-15,共8页Electric Power Science and Engineering

基　　金：国家自然科学基金(51667007);贵州省科学技术基金([2019]1128)、([2018]5615);南方电网公司重点科技项目(GZKJXM20182104)。

摘　　要：传统下垂控制按照固定下垂系数分配不平衡功率,未能兼顾功率合理分配和直流电压稳定。针对这一问题,提出了一种基于模糊规则的下垂控制策略,该策略根据电压偏差和功率裕度实时优化更新下垂系数,通过在各馈线之间快速、合理地分配不平衡功率维持直流电压稳定,并保证传输功率在换流器功率裕度内。最后,以柔性配电网中的负荷投切和光伏波动为算例,在PSCAD仿真软件中对所提控制策略进行了验证,仿真结果表明所提控制方法能使换流器在功率裕度内快速分配不平衡功率,提高直流电压偏差精度,降低换流器容量过载风险。Traditional droop control distributes unbalanced power according to fixed droop coefficient,and it failures to balance reasonable power distribution and DC voltage stability.To solve this problem,this paper proposes a droop control strategy based on fuzzy rules.This strategy optimizes and updates the droop coefficient in real time according to the voltage deviation and power margin,maintaining DC voltage stability by quickly and reasonably distributing unbalanced power between feeders,and ensuring that the transmitted power is within the converter power margin.Finally,this paper takes the load switching and photovoltaic fluctuations in the flexible distribution network as an example and the proposed control strategy is verified by PSCAD simulation software.The simulation results show that the proposed control method can enable the converter to quickly allocate unbalanced power within the power margin,improve the accuracy of DC voltage deviation and reduce the risk of inverter capacity overload.

关 键 词：直流电压 功率裕度 MMC 下垂控制 模糊控制 

分 类 号：TM721[电气工程—电力系统及自动化]