基于改进阻性下垂控制的分布式储能系统SOC均衡策略  

SOC Balancing Strategy for Distributed Energy Storage System Based on Improved Resistive Droop Control

作　　者：颜石 谭海洋 肖华 陈赐 李圣清[2] YAN Shi;TAN Haiyang;XIAO Hua;CHEN Ci;LI Shengqing(State Grid Hengyang Power Supply Company,Hengyang 421600,China;School of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]国网湖南省电力有限公司衡阳供电分公司,湖南衡阳421600 [2]湖南工业大学电气与信息工程学院,湖南株洲412007

出　　处：《湖南电力》2024年第2期104-111,共8页Hunan Electric Power

基　　金：国家自然科学基金项目(51977072)。

摘　　要：低压微电网运行时,由于各分布式储能单元初始状态不一致和输出线路阻抗差异,采用传统阻性下垂控制易出现荷电状态(state of charge,SOC)不平衡问题,由此提出一种基于改进阻性下垂控制的储能系统SOC均衡策略。该策略首先引入动态虚拟复阻抗,消除各逆变器输出线路阻抗差异,实现阻性下垂控制功率解耦和有功功率精确均分。然后改进传统阻性下垂控制方程,通过各分布式储能单元的SOC变化自适应调整下垂系数,确保低压微电网各储能单元在充放电过程的SOC平衡,并对下垂控制过程中的电压与频率偏差进行补偿,进一步提升系统稳定性。最后,通过搭建仿真模型验证了所提策略的有效性。During the operation of low voltage microgrid,due to the inconsistency of the initial state of distributed energy storage units and the impedance difference of the output line,unbalanced state of charge(SOC)is easy to occur when the traditional resistive droop control is adopted.Therefore,the SOC balancing strategy for energy storage system based on improved resistive droop control is proposed in this paper.Firstly,the dynamic virtual complex impedance is introduced to eliminate the impedance difference of the output line of each inverter,and the power decoupling of the resistive droop control is realized and the active power is precisely equalized.Then,the traditional resistance droop control equation is improved,and the droop coefficient is adjusted adaptively by SOC changes of each distributed energy storage units to ensure SOC balance of each energy storage unit in the low-voltage microgrid during the charge and discharge process,and the voltage and frequency deviation in the droop control process is compensated to further improve the stability of the system.Finally,a simulation model is built to verify the effectiveness of the proposed strategy.

关 键 词：低压微电网 DESU 阻性下垂控制 SOC均衡 

分 类 号：TM91[电气工程—电力电子与电力传动]