Hybrid Modulation Based Bidirectional Electrolytic Capacitor-less Three-phase Inverter for Fuel Cell Vehicles: Analysis, Design, and Experimental Results - 2017


This paper presents a novel six-pulse low-frequency (LF) fluctuating high-voltage dc-bus-based mostly Power System architecture for fuel cell vehicles (FCVs) application. A completely unique hybrid modulation theme consisting of six-pulse modulation at LF scale and changed secondary modulation and thirty threep.c pulse width modulation at high-frequency (HF) scale is proposed. 3-section ac waveforms for the propulsion system of FCVs are generated from LF fluctuating high-voltage dc bus. The proposed modulation technique considerably reduces the switching losses of the bidirectional twin-stage inverter: 1) soft-switching of both sides of the front-end current-fed full-bridge converter is realized; and a pair of) at any moment, only one leg of back-end three-phase inverter is switched at HF, while the opposite 2 legs are kept in on or off states. This tremendously reduces the bidirectional inverter's switching losses and improves the system efficiency. The LF fluctuating high-voltage dc bus permits the elimination of large electrolytic dc-link capacitor, that contributes to a additional reliable and compact design. This paper presents the operation, analysis, and style of a bidirectional inverter implementing the proposed hybrid modulation technique. Simulation results obtained from Power Electronics simulation software PSIM and experimental results from the lab prototype clearly validate the effectiveness of the proposed modulation technique.

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