储能科学与技术2024，Vol.13Issue(5)：1564-1573,10.DOI:10.19799/j.cnki.2095-4239.2023.0912
平抑风电出力波动的混合储能功率分配策略
Hybrid energy storage power allocation strategy for smoothing wind power output fluctuations
摘要
Abstract
In recent years,energy storage technology has become an effective means of smoothing wind power fluctuations and improving the acceptance capacity of wind power in the grid;however,wind power fluctuations are complex and variable,and a single energy storage mechanism does not have the required high energy and high power density characteristics.Therefore,to solve the problem of wind power generation power smoothing in terms of its stochastic gap and other typical characteristics,this study intends to use a hybrid energy storage technology,that combines the advantages of lithium-ion batteries and supercapacitors,to design a two-layer power decomposition and allocation strategy based on the adaptive sliding average filtering-wavelet packet decomposition;further,it aims to utilize the sliding average filtering algorithm to complete the adaptive decomposition of wind power,and obtain the minimum power required for grid-connected power and hybrid energy storage systems.The minimum power required for grid-connected power and hybrid energy storage systems is obtained.Considering that the output power of a hybrid energy storage system continues to contain rich information and the rules for determining the number of wavelet packet decomposition layers and the power cut-off point,the wavelet packet algorithm is used to decompose the suppressed wind power twice and optimize the power allocation of the hybrid energy storage system by combining with the inverter entropy value strategy.This improves the fluctuation of the wind power effectively and realizes the optimal decomposition and reasonable allocation of hybrid energy storage power.Comparative analysis of different power allocation methods uses evaluation indexes such as the fluctuation of the national standard time scale,fluctuation before and after the introduction of energy storage,power amplitude,charging and discharging times,etc.The results show that the proposed method can meet the requirements of national standards for wind farm power fluctuation,reduce the impact of fluctuations on the grid,and show better adaptability compared with the traditional wavelet packet decomposition algorithms,with the overall fluctuation situation being improved by 23.69%.The proposed method reduces the lithium battery charging and discharging times by 58.2%.The model evaluation results show that the proposed method can improve the overall economy of the hybrid energy storage system and extend the life of lithium batteries.关键词
混合储能/自适应滑动平均算法/小波分解/变频熵值/功率分配Key words
hybrid energy storage/adaptive sliding average algorithm/wavelet decomposition/variable frequency entropy/power allocation分类
信息技术与安全科学引用本文复制引用
郭东泽,张继红,王庆宇,张帅..平抑风电出力波动的混合储能功率分配策略[J].储能科学与技术,2024,13(5):1564-1573,10.基金项目
内蒙古自治区科技重大专项(2020ZD0017),内蒙古自治区重点研发与成果转化项目(2022YFHH0019),内蒙古自治区新型重要能源综合利用技术集成攻关大平台(2023PTXM001). （2020ZD0017）
