Performance Benchmarking of Active-Front-End Rectifier Topologies Used in High-Power, High-Voltage Onboard EV Chargers
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Tarih
2021
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info:eu-repo/semantics/openAccess
Özet
High power onboard battery chargers employed in electric vehicles (EVs) and plug-in hybrid EVs\r(PHEVs) fed from three-phase mains typically consist of a two-stage structure as AC-DC and DC-DC\rstages. The AC-DC stage is also known as the active front end (AFE). While the AFE rectifies the mains\rvoltage, maintains the power factor, and provides a constant DC-link voltage to the DC-DC converter, the\rDC-DC converter stage regulates the charging current considering the charging algorithms in order to\rextend the battery service life. This study focuses on the selection of cost/performance effective AFE\rtopology that can be used in high power onboard chargers. Four different suitable AC-DC topologies are\rinvestigated: (i) 3-phase 2-level rectifier, (ii) 3-phase, 3-level neutral-point-clamped (NPC) rectifier, (iii)\r3-phase, 3-level T-type rectifier, and (iv) Vienna rectifier. In this study, the aforementioned AFE\rtopologies have been simulated on the PLECS/SpeedFit environment and compared in terms of\refficiency, losses, temperature, the number of switching elements, cost and cost/efficiency metrics. The\rperformance results of the aforementioned topologies have been evaluated under different operating\rfrequencies. The results reveal that the most suitable topology alternatives for the front-end AC-DC\rconverter are 3-phase 2-level PWM rectifier and Vienna rectifier. Although the 3-phase 2-level PWM\rrectifier is superior with its 12% cost advantage, fewer components, and ease of control advantages, it\rlags a little behind the Vienna rectifier in terms of total harmonic distortion.
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Çukurova Üniversitesi Mühendislik Fakültesi dergisi
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4
