计及多点电池储能系统的电网二次调频协同控制

Coordination control for secondary frequency regulation with participation of multiple battery energy storage systems

在“碳达峰•碳中和”国家能源战略变革背景下,大规模可再生能源的加速并网加剧了电力系统对于快速调频资源需求的迫切性,如何充分发挥以电池储能系统(battery energy storage systems,BESS)为代表的新型快速资源在电网调频中的作用是解决该问题的关键。首先,为满足电网各类型调频资源在自动发电控制(automatic generation control,AGC)系统中的接入监视与分类决策需求,提出“域-群-机”三级控制模型架构;然后,从BESS的荷电状态(state of charge,SOC)主动管理出发,提出基于改进的动态调频容量(dynamic available AGC,DAA)的多元集群协同控制策略,以及引入SOC影响因子的多点BESS功率分配策略;最后,结合实际电网的持续扰动工况及模拟跳机扰动工况进行仿真分析,验证了文中所提控制策略的有效性。文中所提策略不但可以显著改善各单点BESS的SOC一致性,而且能够提升电网调频品质。

In the procedure of carbon peaking and carbon neutrality energy revolution,large-scale renewable energy is aggrandizing frequency regulation capacity of power grid.How to make the best use of new rapid resources,represented by battery energy storage systems(BESS),in the secondary frequency regulation is the key to solve the problem.Firstly,a three-layer frame is designed,embodying area,cluster and plant,which can satisfy the needs for access monitoring and classification decision of various regulation resources in automatic generation control(AGC)system.Secondly,a coordination control strategy including BESS is proposed,and so is the strategy of regulation requirements assignment based on state of charge(SOC)effecting factor in BESS group.Finally,simulations are conducted for continuous disturbance cases from an actual power system,as well as simulations for tripping fault disturbances.The results show that the proposed strategy can improve the SOC consistency between the respective BESS,promoting the availability of BESS,and improve the performance of network frequency response characteristics either.