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A Highly Integrated Electric Traction System With Bidirectional Energy Conversion for EVs/HEVs
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DOI：10.1109/jestpe.2026.3688763.png)
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Abstract
En 中文
A highly integrated electric traction system (ETS) is a key technology for promoting electric vehicles (EVs) and hybrid EVs (HEVs). This article proposes an integrated ETS with bidirectional energy conversion, aiming to reduce costs at the power electronics level. Unlike conventional ETS configurations, the proposed system eliminates the need for a separate physical DC/DC converter. Instead, it powers the battery bank through the neutral point of the traction motor using a smoothing inductor. To clearly illustrate the operating principles, a detailed mathematical model of the system is developed. Two equivalent circuits representing the positive-sequence and zero-sequence components are derived from the model. The zero-sequence circuit effectively fulfills the role of a bidirectional DC/DC converter. Power flow behavior under both driving and regenerative braking conditions is analyzed within these two circuit frameworks. To enable coordinated control of the traction motor and DC-bus voltage, an extended field-oriented control (EFOC) strategy is introduced, incorporating additional regulators for DC-bus voltage and neutral-point current. Finally, comparative experiments are conducted on a 1.2-kW test bench, demonstrating the effectiveness of the proposed ETS and its control strategy under both motoring and braking operations.
Keywords:
Bidirectional DC/DC converter
electric traction system (ETS)
extended field-oriented control (EFOC)
regenerative braking
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4.9
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249
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0
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