access icon free Reduced switching state multilevel improved power factor converter for level-3 electric vehicle applications

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.

Inspec keywords: power grids; power system control; battery chargers; switching convertors; harmonics suppression; power supply quality; invertors; power factor; electric current control; electric vehicles; power convertors; AC-DC power convertors; battery powered vehicles; voltage control

Other keywords: negative sequence elimination control; dc-link voltage change; reduced switching state multipoint clamped; reduced switching state multilevel; level-3 electric vehicle charging; active input current shaping; EV charging; level-3 charging circuits; off-board multiterminal dc charger; standard ac grid; level-3 electric vehicle; power factor converter

Subjects: Power system control; Voltage control; Transportation system control; Power system management, operation and economics; Transportation; Power supply quality and harmonics; AC-DC power convertors (rectifiers); Current control; DC-AC power convertors (invertors); Control of electric power systems; Electric actuators and final control equipment

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2019.0193
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content/journals/10.1049/iet-pel.2019.0193
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