摘要
针对孤岛型微电网逆变器并联运行系统中由于系统交流母线至各逆变器线路之间的距离不同导致其输出总阻抗不同,使得系统的输出功率无法达到均分,产生功率环流等问题,在传统的P-V/Q-f下垂控制策略的基础上提出一种基于动态虚拟阻抗自适应的下垂控制策略。将虚拟阻抗设计成一个跟随系统电压和电流变化的动态虚拟阻抗。在动态虚拟阻抗回路的作用下,不断调整虚拟阻抗的值,以弥补系统电压降落,同时抑制功率环流。最后,通过建立MATLAB仿真模型对该方法进行仿真测试,通过仿真验证了该方法的可行性。
In an isolated micro-grid system with the operation of parallel inverters,due to different distances between the AC bus and inverter lines,the total output impedances of the system are different,which makes the output power from the system unequal and generates a power loop.On the basis of the traditional P-V/Q-f droop control strategy,a droop control strategy based on dynamic virtual impedance adaptation is proposed in this paper.The virtual impedance is designed as a dynamic virtual impedance that follows the voltage and current changes of the system.In the dynamic virtual impedance loop,the value of virtual impedance is adjusted continuously to compensate for the system voltage drop while restraining the power loop.Finally,a MATALB simulation model is built to test the proposed method,and its feasibility is verified through simulations.
作者
朱作滨
黄绍平
李振兴
ZHU Zuobin;HUANG Shaoping;LI Zhenxing(School of Electronics and Information Engineering,Hunan Institute of Engineering,Xiangtan 411100,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2020年第2期119-124,共6页
Proceedings of the CSU-EPSA
关键词
下垂控制
动态虚拟阻抗
电压补偿
功率环流
droop control
dynamic virtual impedance
voltage compensation
power loop
