基于浸入与不变理论的电动汽车快充站飞轮储能系统非线性控制策略
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上海电力大学 电气工程学院

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上海市科技创新行动计划(20DZ2205500)Project Supported byShanghai Science and technology innovation action plan


Nonlinear control strategy of flywheel energy storage system for electric vehicle fast charging station based on immersion and invariance theory
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College of Electrical Engineering,Shanghai University of Electric Power

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    摘要:

    为更好地补偿快充站直流侧母线电压跌落并限制电网功率爬坡率,提出一种基于浸入与不变理论的直流快充站飞轮储能系统非线性控制策略。首先,考虑快充站供电系统功率平衡关系,分析飞轮储能传统控制策略下充电负荷接入瞬间引发的冲击特性,确立直流母线电压稳定为优化目标。然后,考虑快充站母线电压控制效果和储能出力电流控制精度,建立飞轮储能的仿射非线性模型,利用浸入与不变方法构建流形面及控制律以提供快速响应充电负荷电流突变和飞轮转速变化的能力,并设计储能系统充放电控制策略。最后,搭建仿真模型对单/多台电动汽车接入下不同控制策略进行对比分析,结果表明所提控制策略可有效抑制电动汽车接入及飞轮转速变化对母线电压的影响,缓解对配电网的冲击。

    Abstract:

    In order to better compensate the voltage drop of DC side bus of fast charging station and limit the power ramp rate of power grid , a nonlinear control strategy for flywheel energy storage system of DC fast charging station based on immersion and invariance theory is proposed. Firstly, considering the power balance relationship of the power supply system of the fast charging station, the impact characteristics caused by the charging load instantaneous access under the traditional control strategy of flywheel energy storage system are analyzed, and the voltage stability of DC bus is determined as the optimization objective. Then, the effect of bus voltage control and the accuracy of power output current control are considered, an affine nonlinear model of flywheel energy storage is established, the manifold surface and control law are constructed by using the immersion and invariance method to provide the ability to quickly respond to charging load current mutation and flywheel speed change, and the charging and discharging control strategy of energy storage system is designed. And finally, the simulation model is built to compare and analyze different control strategies under single/multiple electric vehicle access, the results show that the proposed control strategy can effectively suppress the influence of flywheel speed changes and load access on the bus voltage, and the impact on the distribution network is alleviated.

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  • 收稿日期:2021-11-26
  • 最后修改日期:2022-01-11
  • 录用日期:2022-03-04
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