In this study, an off-board multi-terminal dc charger with active input current shaping for level-3 electric vehicle (EV) charging applications is proposed. The configuration is based on reduced switching state multi-point clamped, three phase improved power factor converter and supplied by the standard ac grid. The topology has the advantage of reduced device count along with reduced maximum device stress. This will increase the speed of EV charging and enables the reduction of capital and maintenance costs of the charging facilities, enhancing further expansion of the eco-friendly transport. In addition, one of the key performance indicator, i.e. the fault ride-through capability, is investigated in the proposed topology under various unbalanced input conditions. Further, steady-state and transient performance of topology during load, as well as, dc-link voltage change is presented. Minimum distorted and balanced line currents are drawn from supply by implementing negative sequence elimination control algorithm. The validation of the proposed topology is verified with simulation and a down-scaled experimental setup.

中文翻译：

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降低开关状态的多级改进功率因数转换器，用于3级电动汽车应用

在这项研究中，提出了一种用于有源三级电动汽车（EV）充电应用的具有有源输入电流整形功能的板外多端子直流充电器。该配置基于降低的开关状态多点钳位，三相改进的功率因数转换器，并由标准交流电网提供。拓扑具有减少设备数量以及减少最大设备压力的优势。这将提高电动汽车的充电速度，并减少充电设施的资金和维护成本，从而进一步促进环保运输的发展。另外，在各种不平衡输入条件下，在提出的拓扑中研究了关键性能指标之一，即故障穿越能力。此外，负载期间拓扑的稳态和瞬态性能以及 给出了直流母线电压变化。通过实施负序消除控制算法，可从电源中获取最小的失真和平衡线电流。通过仿真和按比例缩小的实验设置来验证所提出拓扑的有效性。