中国电机工程学报2024，Vol.44Issue(22)：8884-8896,中插16,14.DOI:10.13334/j.0258-8013.pcsee.231160
基于老化成本实时次梯度的异构储能系统功率分配策略
Power Allocation Strategy for Heterogeneous Energy Storage System Based on Real-time Subgradients of Aging Cost Function
摘要
Abstract
With the promotion of lithium-ion batteries and the development of hybrid energy storage technologies,the difference of energy storage units in the energy storage system becomes more and more significant,which puts forward challenges for power allocation.In order to reduce the aging cost of energy storage systems during operation,this paper proposes a power allocation strategy based on the cycle-based aging feature of each energy storage unit to reduce aging costs.An online rainflow counting method is proposed for real-time updating of power-cycle mapping relationships,then the real-time subgradients of the aging cost with respect to charging and discharging power are obtained by using the chain rule of differentiation.The reciprocal of real-time subgradients is used as power allocation weight to achieve equalizing aging costs of energy storage units.A transferrable power allocation algorithm is further developed,which allocates power according to weights while considering power limits and the state of charge(SOC)boundary of energy storage units.In an energy storage system participating in secondary frequency regulation,the proposed strategy can reduce the aging cost by 8.08%and 10.34%,respectively,compared with two commonly used power allocation methods(based on maximum power and residual energy).关键词
电池储能系统/功率分配/老化成本/雨流计数法/实时次梯度Key words
battery energy storage system/power allocation/aging cost/rainflow counting/real-time subgradient分类
信息技术与安全科学引用本文复制引用
刁锐,胡泽春,钱伟杰,刘维亮,宋永华..基于老化成本实时次梯度的异构储能系统功率分配策略[J].中国电机工程学报,2024,44(22):8884-8896,中插16,14.基金项目
国家重点研发计划项目(2022YFB2403000) （2022YFB2403000）
国家电网有限公司科技项目(5419-202199514A-0-5-ZN). National Key R&D Program of China(2022YFB2403000) （5419-202199514A-0-5-ZN）
Science and Technology Project of State Grid Corporation of China(5419-202199514A-0-5-ZN). （5419-202199514A-0-5-ZN）
