摘要
以光伏阵列发电、锂电池储能、直流负荷和网侧变换器组成的直流微网为研究对象,将整个系统分为6种运行模式,通过不同工作模式的转换运行研究该微网的协调控制策略。锂电池分为2组,为提高电池和系统整个运行效率,优化电池的工作特性,引入了能量均衡的思想,将能量均衡算法和基于蓄电池荷电状态量的下垂控制相结合,以此达到2组锂电池功率均衡的目的。利用Matlab/Simulink仿真软件搭建了该系统的仿真模型,通过改变负荷功率的大小实现系统运行的变化,仿真结果表明,直流母线电压保持恒定,整个系统的功率达到了平衡,验证了系统协调控制策略的可行性。
Taking photovoltaic array power generation,lithium battery energy storage,DC load and grid-side converter as the research objects,the whole system was divided into 6 working modes,and the coordinated control strategy of the microgrid was studied through the conversion operation of different working modes.The lithium battery was divided into two groups.In order to improve the efficiency of the battery and the whole system and optimize the working characteristics of the battery,the idea of energy balance was introduced,and the energy balance algorithm was combined with the droop control based on the state of charge value,which helped to achieve power balance of two groups of lithium batteries.The simulation model of the system was built using Matlab/Simulink software.The change of system operation was realized by changing the size of load power.The simulation results show that the DC bus voltage keeps constant,the power balance of the entire system is realized,and the feasibility of the coordinated control strategy of the system is verified.
作者
李靖
王志和
倪浩
LI Jing;WANG Zhihe;NI Hao(College of Electric Power,Inner Mongolia University of Technology,Hohhot 010080,Inner Mongolia Autonomous Region,China;Inner Mongolia Regional Key Laboratory of Electrical Power Conversion,Transmission and Control(Inner Mongolia University of Technology),Hohhot 010080,Inner Mongolia Autonomous Region,China)
出处
《发电技术》
2021年第6期765-774,共10页
Power Generation Technology
基金
国家自然科学基金项目(51767019)。
关键词
直流微网
协调控制
能量均衡
下垂控制
DC microgrid
coordinated control
energy balance
droop control
