摘要
孤岛型微电网采用传统下垂控制策略时,无法按照无功下垂系数对负荷无功功率进行合理分配,严重影响了微电网系统的稳定运行。针对这一问题提出改进下垂控制策略,在传统下垂控制策略的基础上加入自适应虚拟阻抗,根据中央控制器发送给分布式电源逆变器的无功功率参考值,改变虚拟阻抗值,在不需测量线路阻抗的情况下,使因线路阻抗差异导致的电压降落差得到改善,实现负荷无功功率的合理分配。在Matlab/Simulink仿真平台上建立了基于自适应虚拟阻抗的孤岛型微电网下垂控制模型,通过对1∶1∶1相同容量和1∶2∶3不同容量下功率分配的结果分析,验证了该控制策略的可行性和有效性。
The islanded microgrid cannot allocate the reactive power of the load reasonably according to the reactive power droop coefficient when using traditional droop control strategy,which seriously affects the stable operation of the microgrid system.To address this issue,an improved droop control strategy is proposed.On the basis of the traditional droop control strategy,an adaptive virtual impedance is added,which can change the virtual impedance value based on the reactive power reference value sent by the central controller to the distributed power inverters.Without measuring the line impedance,the voltage drop caused by the difference in line impedance can be improved,and the reasonable allocation of load reactive power can be achieved.This study establishes a droop control model for islanded microgrids based on adaptive virtual impedance on the Matlab/Simulink simulation platform.The feasibility and effectiveness of the control strategy are verified by analyzing the results of power allocation under the same capacity of 1∶1∶1 and different capacities of 1∶2∶3.
作者
刘武扬
胡伟
晋世博
张民幸
LIU Wuyang;HU Wei;JIN Shibo;ZHANG Minxing(School of Electrical Engineering,Xuchang University,Xuchang Henan 461000,China;School of Materials Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China)
出处
《兰州工业学院学报》
2025年第6期76-82,共7页
Journal of Lanzhou Institute of Technology
基金
许昌学院科研项目(2025YB001)
兰州工业学院博士科研启动金(2023PY-03)
河南省高等学校重点科研项目(25A470011)。
关键词
微电网
虚拟阻抗
下垂控制
无功功率
microgrid
virtual impedance
droop control
reactive power
