基于充放电裕度的电动汽车集群一次调频控制策略

Primary frequency regulation control strategy for electric vehicle aggregation based on charging and discharging margin

针对未来电网一次调频资源不足的问题,文中提出一种基于充放电裕度的电动汽车集群虚拟储能参与电网一次调频的自适应控制策略。首先,分析电动汽车的调控运行范围。其次,研究电动汽车集群参与电网一次调频方法。考虑电动汽车充放电时间和电池荷电状态(state of charge,SOC)裕度,设计电动汽车充放电裕度指标。接着,提出基于充放电裕度的自适应一次调频控制策略,优化电动汽车参与一次调频的下垂功率,从而兼顾电网一次调频和电动汽车充放电需求。然后,通过定时更新方式评估电动汽车集群虚拟储能的一次调频能力,并提出一次调频效果评价指标。最后,通过区域电网仿真案例分析,验证所提策略减少系统频率偏差和优化电动汽车一次调频出力的有效性。

Aiming at the problem of insufficient primary frequency regulation resources of power grid in the future,an adaptive control strategy based on charging and discharging margin is proposed for virtual energy storage of electric vehicle aggregation to participate in primary frequency regulation of power grid.Firstly,regulatory and operating range of the electric vehicle is analyzed.Secondly,the primary frequency regulation method of electric vehicle aggregation participating in the power grid is studied.Considering the margin of charging and discharging time and state of charge(SOC),charging and discharging margin index of electric vehicles is designed.Then,an adaptive primary frequency regulation control strategy based on charging and discharging margin is proposed to optimize the droop power of electric vehicles participating in primary frequency regulation,which considers both requirements of primary frequency regulation of power grid and charging,discharging of electric vehicles.Then,the primary frequency regulation capability of virtual energy storage in electric vehicle aggregation is evaluated by regular update,and the evaluation index of primary frequency regulation effect is proposed.Finally,through the simulation analysis of regional power grid cases,the effectiveness of the proposed strategy in reducing the system frequency deviation and optimizing the primary frequency regulation output of electric vehicles is verified.