考虑电池储能单元分组优化的微电网运行控制策略

针对大规模电池储能系统参与微电网调节面临储能单元充放电路径优化选择问题，基于对储能单元能量转换效率与运行功率关系的研究，提出了以双电池储能系统（DBESS）控制策略为基础，充、放电单元组可临时转换的控制方式,以克服DBESS结构功率调节能力不足的问题。制定了储能单元间功率分配机制以降低储能单元启用数量，减少了储能单元因功率分配不当而造成不必要的寿命衰减和能量损耗。基于含8个储能单元的风光储共交流母线型微电网系统，结合给定功率波动平抑需求，对所提控制策略、DBESS控制策略和传统控制策略进行仿真分析，从储能系统控制效果、循环寿命和能量转换效率的角度验证了所提策略的合理性和有效性。

Operation Control Strategy of Microgrid Considering Grouping Optimization of Battery Energy Storage Units

Aiming at the issue of optimal selection of charging and discharging paths of energy storage units when large-scale battery energy storage systems participate in microgrid regulation, this paper studies the relationship between energy conversion efficiency and operation power of energy storage units. Based on the control strategy of the double battery energy storage system(DBESS), this paper proposes a control method in which charging and discharging unit groups can be temporarily converted, to solve the problem of insufficient power regulation capability of the DBESS. A power distribution mechanism among energy storage units is formulated to reduce the number of energy storage units in operation and reduce the unnecessary life attenuation and energy loss of the energy storage unit due to improper power distribution. Based on the wind-solar-storage common AC bus microgrid system with eight energy storage units, and combined with the given power fluctuation suppression demand, the proposed control strategy, DBESS control strategy and conventional control strategy are simulated and analyzed. The rationality and effectiveness of the proposed strategy are verified from the control effect, cycle life and energy conversion efficiency of the energy storage system.