基于效能评估的混合储能电站调频功率优化

Frequency Regulation Power Optimization of Hybrid Energy Storage Station Based on Efficiency Evaluation

混合储能电站由含不同类型及不同性能的储能单元组成,为有效利用各独立储能单元的调频性能,亟需完善混合储能电站参与电网调频功率优化策略。为此,提出了考虑储能参与系统调频效能的混合储能电站功率控制策略,建立了包含储能参与调频成本、效益和性能3类6大指标的效能评估体系,采用基于层次分析法和熵权法的主客观综合权重TOPSIS评价法对各储能单元调频综合效能进行评估;并考虑各储能参与调频的效能,以其技术特征为约束实现调频需求在各储能单元之间的优化分配。经含6个不同技术特征储能单元的混合储能电站验证表明,所提策略可以兼顾各储能的调频性能及成本效益,充分发挥不同类型储能的调频潜力,提升系统频率性能,提升储能电站总体效益,激励储能提供更好的调频服务。

The hybrid energy storage station consists of energy storage units with different types and different performances.To utilize the frequency regulation(FR)performance of each independent energy storage unit effectively,it is urgent to improve the power optimization strategy of the hybrid energy storage station participating in the power grid FR.This paper proposes a power control strategy in which the FR efficiency of energy storage units participating in the grid is taken into account.An efficiency evaluation system that includes three categories of energy storage FR cost,benefit,and performance with six indicators is established.The TOPSIS evaluation method of subjective and objective comprehensive weights based on the analytic hierarchy process and entropy weight method is adopted to evaluate the comprehensive efficiency of each energy storage unit.The efficiency of each energy storage unit in FR is taken into account,and the technical characteristics are taken as constraints to realize the optimal distribution of FR demand among them.The verification of a hybrid energy storage station including six energy storage units with different technical characteristics shows that the proposed strategy can compromise the FR performance and cost of each energy storage,utilize the FR potential of different energy storage types,improve the system frequency performance,enhance the overall benefits of the energy storage station,and stimulate energy storage to provide better FR services.