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The role of electric vehicles for frequency regulation during grid restoration

机译:电动汽车在电网恢复中对频率调节的作用

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Power system restoration after a blackout involves generation restart, energization of buses/power lines and sequential load pickup. During this process, it is of paramount importance to maintain system frequency stable to prevent system collapse or cascading events. As a fast response energy resources in smart grid with bidirectional power flow capability, Electric Vehicle (EV) can be used to compensate for load-generation imbalance in the system which stabilizes frequency and accelerate the load pick up process. In this paper, an optimization problem is formulated which utilizes EVs to provide for frequency regulation over the restoration time horizon. At the end of restoration the EVs are also returned to their initial State of Charge (SOC). The problem is solved as a finite time optimal control problem which determines the global optimal charging/discharging trajectories of the EV batteries which regulates system frequency and also returns the SOC of the batteries to the original state at the end of restoration. Simulations are carried out to illustrate the analytical results.
机译:停电后的电力系统恢复包括发电重新启动,总线/电力线通电和顺序负载提取。在此过程中,保持系统频率稳定以防止系统崩溃或级联事件至关重要。作为具有双向潮流功能的智能电网中的快速响应能源,电动汽车(EV)可用于补偿系统中的负载生成不平衡,从而稳定频率并加快负载提取过程。在本文中,提出了一个优化问题,该问题利用电动汽车在恢复时间范围内提供频率调节。在恢复结束时,EV也将返回其初始充电状态(SOC)。该问题作为有限时间最优控制问题解决,该问题确定了确定系统频率的EV电池的全局最佳充电/放电轨迹,并在恢复结束时将其SOC恢复到原始状态。进行仿真以说明分析结果。

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