This paper proposes a battery charger (BC) for electric vehicles based on sinusoidal-ripple-current (SRC) method. The SRC method is used as an advanced charging-discharging method. On the one hand, the sinusoidal current variations alternately change output active power of the BC, negatively affect AC-side terminal current of the BC, and therefore, cause a power quality problem. On the other hand, the output active and reactive powers must be regulated at constant values without any variations for participation in vehicle-to-grid technology. Thus, a particular topology is suggested and then a control system is precisely designed in order to implement SRC charging-discharging method and adjust the output active and reactive powers for vehicle-to-grid technology without the power quality problem. SRC method can also be used in online electrochemical impedance spectroscopy (EIS) for state of charge and state of health estimation in battery management. The proposed control system can also generate the SRC signals, suitable for online EIS, in a controlled way unlike the recently proposed BCs. The simulation and experimental results demonstrate the effectiveness of the proposed solution.

中文翻译：

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电动汽车电池充电器的正弦纹波电流控制

本文提出了一种基于正弦纹波电流 (SRC) 方法的电动汽车电池充电器 (BC)。SRC方法被用作一种先进的充放电方法。一方面，正弦电流变化交替改变BC的输出有功功率，对BC的交流侧端电流产生负面影响，从而导致电能质量问题。另一方面，必须将输出有功和无功功率调节为恒定值，而不会因参与车辆到电网技术而发生任何变化。因此，提出了一种特定的拓扑结构，然后精确设计了控制系统，以实现 SRC 充放电方法并调整车辆到电网技术的输出有功和无功功率，而不会出现电能质量问题。SRC 方法还可用于在线电化学阻抗谱 (EIS)，用于电池管理中的充电状态和健康状态估计。与最近提出的 BC 不同，所提出的控制系统还可以以受控方式生成适用于在线 EIS 的 SRC 信号。仿真和实验结果证明了所提出的解决方案的有效性。