This article presents a T-type 5-level inverter based dynamic voltage restorer (DVR) as a power quality (PQ) solution to enhance DC-bus voltage regulation in grid fed electric vehicle fast charging stations (EVFCS). The designing of DVR connected EVFCS is carried out in this work. There is a noticeable impact of EV loading on EVFCS performance. To observe the effect of EVs loading on DC-bus, three Li-ion battery packs are used. The performance of closed loop current regulated buck converters is examined for various loading scenarios. Further, the impact of EVs loading on several EVFCS parameters, including DC-bus voltage, charging current, battery SOC and battery voltage is examined in simulation. A closed loop voltage controller based on the $ \alpha \beta$ to dq transformation is constructed for 1- $ \phi$ DVR in order to reduce the loading effect of EVs. This DVR maintains the rated DC-bus voltage (110 V), guaranteeing proper voltage regulation and the rated current of each battery under all three loading scenarios. Additionally, the DVR protects the point of common coupling (PCC) from voltage harmonics generated by EVFCS and maintains it within the IEEE 519 limit. Finally, to validate the simulation results, an experimental study is also carried out on reduced scale with a T-type 5-level DVR to observe the improved performance of EVFCS.

中文翻译：

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使用基于 MLI 的 DVR 改善并网电动汽车快速充电站的直流母线电压调节


本文介绍了一种基于 T 型 5 电平逆变器的动态电压恢复器 (DVR)，作为电能质量 (PQ) 解决方案，用于增强并网电动汽车快速充电站 (EVFCS) 中的直流母线电压调节。本工作进行了DVR连接EVFCS的设计。 EV 负载对 EVFCS 性能有显着影响。为了观察电动汽车负载对直流母线的影响，使用了三个锂离子电池组。针对各种负载情况检查闭环电流调节降压转换器的性能。此外，还通过仿真研究了电动汽车负载对多个 EVFCS 参数（包括直流母线电压、充电电流、电池 SOC 和电池电压）的影响。基于闭环电压控制器$\阿尔法\贝塔$为 1- $\phi$ DVR 构建到 dq 变换，以减少 EV 的负载效应。该 DVR 保持额定直流母线电压 (110 V)，保证在所有三种负载情况下正确的电压调节和每个电池的额定电流。此外，DVR 还可以保护公共耦合点 (PCC) 免受 EVFCS 生成的电压谐波的影响，并将其保持在 IEEE 519 限制范围内。最后，为了验证仿真结果，还使用T型5级DVR进行了缩小规模的实验研究，以观察EVFCS的性能改进。