计及健康状态差异的集中式共享储能分级调控策略

HIERARCHICAL CONTROL STRATEGY FOR CENTRALIZED SHARED ENERGY STORAGE CONSIDERING DIFFERENCES IN HEALTH STATUS

针对发电侧储能利用率低、经济性差的问题,提出包含新电池、退役电池(后文简称新旧电池)的发电侧集中式储能共享结构与分级调控策略。首先,设计计及健康状态差异的新能源场站群集中式储能资源共享结构,凭借聚合调控手段应对多方主体的调节需求;其次,通过分析新旧电池性能差异,以最大可用容量表征健康状态(SOH)、以荷电状态(SOC)计算实时可用裕量,兼顾两者制定储能单元出力排序规则,提出计及SOH和可用裕量的电池储能单元群分级调控策略。最后,结合算例分析表明:包含新旧电池的集中式共享储能可提升利用率和经济性;所提调控策略可使新旧电池单元动作次数分别降至等比例策略的53.68%和20.79%,充放电转换总次数降至等比例策略的14.29%,且能保持较好的储能调节能力。

To address the issues of low energy storage utilization and poor economic efficiency on the power generation side,a centralized energy storage sharing structure for the power generation side and a hierarchical control strategy are proposed,including new batteries and retired batteries.Firstly,design a centralized energy storage resource sharing structure for renewable energy station clusters that considers differences in health status,and respond to the power needs of multiple stations through aggregated control methods.Secondly,by analyzing the performance differences between new and old batteries,the maximum available capacity is used to represent the state of health(SOH),and the state of charge(SOC)is used to calculate the available charge and discharge margin in real time.The energy storage units’output ranking rule is formulated,and a hierarchical control strategy for the battery energy storage units considering SOH and available charge and discharge margin is proposed.Finally,a case study shows that a hybrid configuration of new and old batteries can reduce investment costs.The proposed control strategy can reduce the number of actions of new and old battery units to 53.68%and 20.79%,respectively,and the total number of charge and discharge state transitions to 14.29%,while maintaining good energy storage regulation capability continuously.