基于改进SOC幂指数下垂控制的混合储能能量均衡策略
Energy balancing strategy for hybrid energy storage based on improved SOC power exponential droop control
张亦君 1李培强 1陈琦 1刘喜凤 1张仕鹏1
作者信息
- 1. 福建理工大学 电子电气与物理学院,福建 福州 350118
- 折叠
摘要
为了抑制微电网电压波动、消纳不平衡功率,针对直流微电网中的锂电池和超级电容混合储能系统,提出一种改进SOC幂指数的下垂控制能量管理方法.该方法不仅改进了传统下垂控制电流均衡度差和会导致电压偏差的缺点,还采用阻抗在线检测法量化线路电阻值,消除了其对储能输出电流均衡度的影响,并通过二次控制对下垂控制所引起的直流母线电压偏移进行补偿.基于Matlab/Sim-ulink仿真平台搭建了光储直流微电网仿真系统模型,检验了所搭直流微电网的电压稳定效果,并验证了改进SOC幂指数下垂控制方法相对于传统下垂控制方法的优越性.
Abstract
In order to suppress the voltage fluctuation of microgrid and absorb unbalanced power,a droop con-trol energy management method based on improved SOC power index is proposed for the hybrid energy storage system of lithium battery and super capacitor in DC microgrid.This method not only improves the shortcomings of poor current balance and voltage deviation caused by traditional droop control,but also uses online imped-ance detection method to quantify the line resistance value,eliminates its influence on the balance of energy storage output current,and compensates for the DC bus voltage offset caused by droop control through seconda-ry control.Finally,a simulation system model of optical storage DC microgrid is constructed based on the Mat-lab/Simulink simulation platform,which tests the voltage stability effect of the DC microgrid,and verifies the superiority of the improved SOC power index droop control method over the traditional droop control method.
关键词
直流微电网/混合储能/SOC幂指数下垂控制/阻抗在线检测Key words
DC microgrid/hybrid energy storage/SOC droop control/online impedance detection引用本文复制引用
出版年
2024
NETL
NSTL
万方数据