考虑环境温度的磷酸铁锂电池SOC实时修正及频率控制方法  

Real-Time SOC Correction and Frequency Control Method for LFP Batteries Considering Ambient Temperature

作　　者：余杰 廖思阳[1,2] 徐箭 杨璨然[1,2] 王新迎 Yu Jie;Liao Siyang;Xu Jian;Yang Canran;Wang Xinying(Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network,Wuhan 430072 China;School of Electrical Engineering and Automation Wuhan University,Wuhan 430072 China;China Electric Power Research Institute,Beijing 100192 China)

机构地区：[1]交直流智能配电网湖北省工程中心,武汉430072 [2]武汉大学电气与自动化学院,武汉430072 [3]中国电力科学研究院有限公司,北京100192

出　　处：《电工技术学报》2023年第17期4564-4573,共10页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2020YFB0905904)。

摘　　要：配置储能系统是解决新能源机组并网对电网产生冲击,保证系统安全可靠运行的有效手段。温度会对磷酸铁锂(LFP)电池的电性能产生显著的影响,从而影响储能参与电网调频过程中的实际充放电情况。该文重点分析温度对LFP电池荷电状态(SOC)的影响,首先展开温度对LFP电池实际容量、充放电效率等电池特性的影响机理研究,结合设备厂商给出的实际测试数据,提出基于环境温度的LFP电池模型参数修正方法;然后研究储能系统考虑校正SOC的时变下垂控制方法,提供快速频率支撑;最后在改进的IEEE 13节点微电网上验证了考虑环境因素后,能更准确地估计储能的SOC状态,提高了电力系统频率控制可靠性。Lithium iron phosphate(LFP)batteries occupy an important position in the field of energy storage system(ESS)because of their excellent charge and discharge performance,better safety and cycle life.Temperature is an important factor in the application of LFP,affecting the capacity and material activity of LFP under operating conditions.The physical model of ESS involved in system frequency control is often based on conventional model data.However,the traditional mechanism model analysis and optimal control methods are difficult to meet the requirements of actual system.Therefore,this paper proposes a real-time correction method of model parameters based on environmental temperature correlation when ESS is involved in system frequency control,which can estimate the SOC of ESS more accurately and improve the reliability of frequency control.Firstly,the mechanism analysis of temperature on the performance parameters of LFP is developed,focusing on the reasons for the impact of high and low temperature on the actual capacity and charging/discharging efficiency of the battery.Secondly,based on the actual test data provided by the manufacturer,the temperature coefficient and coulomb correlation coefficient are used to correct the actual capacity and efficiency,followed by real-time correction of the SOC in battery operation.Subsequently,the time-varying droop control method of the ESS considering the corrected SOC is studied to provide fast frequency support.The SOC considering environmental factors during actual operation will be different from the SOC without considering the extreme temperature,which will also affect the arrival time of the high and low alert positions in the operation state,thus affecting the battery discharge.By making real-time corrections to the SOC,the accuracy of ESS participation in system frequency regulation can be improved.The improved IEEE13 node simulation results show that:under the step disturbance of the system by the sudden change of load,the SOC of ESS is always in the normal range wi

关 键 词：磷酸铁锂电池 荷电状态(SOC) 环境温度 充放电效率 频率控制 

分 类 号：TM732[电气工程—电力系统及自动化]