计及荷电状态的并联储能微电网孤岛运行策略  

Microgrid Parallel Energy Storage Island Operation Strategy Based on State of Charge

作　　者：单新文 朱佳佳 查俊杰 陆佳鑫 SHAN Xin-wen;ZHU Jia-jia;ZHA Jun-jie;LU Jia-xin(State Grid Jiangsu Electric Power Company Information&Telecommunication Branch,Nanjing 210024,China)

机构地区：[1]国网江苏省电力有限公司信息通信分公司,江苏南京210024 [2]华北电力大学(北京),北京100096

出　　处：《电力电子技术》2024年第5期80-84,89,共6页Power Electronics

基　　金：江苏省碳达峰碳中和科技创新专项基金(BE2022003)。

摘　　要：储能系统(BESS)为含波动性可再生能源(RES)、负荷扰动大的微网孤岛运行实现系统稳定提供了一种有效的方法。这里分析了并联型储能系统(P-BESS)的工作原理,根据电池系统工作特性并结合传统下垂控制,提出了基于电池荷电状态(SOC)的负荷分配功率外环控制策略,同时,考虑到下垂控制存在固有静态误差、中低压电网线路阻抗不完全为纯感性等因素,提出了含线性补偿环的电压幅值-频率内环控制策略。仿真和实验结果表明,在不同带载情况下,该系统不仅能维持系统电压幅值和频率稳定、且能有效地分配负荷功率,进而提高电池均衡管理能力。The battery energy storage system(BESS)provides an effective method for the islanded operation of microgrid with fluctuating renewable energy sources(RES)and large load disturbance to achieve system stability.The operational principle of parallel-connected battery energy storage system(P-BESS)is analyzed.On the basis of the analysis of operating characteristic of battery system and traditional droop control,the load sharing power outer loop control strategy based on state of charge(SOC)of battery system is proposed.Meanwhile,considering the inherent static error in droop control and the impedance being not pure inductance in middle or low voltage grid,a voltage amplitude-frequency inner loop control strategy based on linear compensating loop is presented.Simulation and experimental results show that not only the voltage and frequency of the system can be kept at desired level,but alos the load powers can be shared effectively regardless of various loads by the proposed method,which contributes to the balance management of battery system.

关 键 词：电池 负荷分配 电压幅值-频率内环控制 荷电状态 

分 类 号：TM912[电气工程—电力电子与电力传动]