A NEW INPUT-PARALLEL-OUTPUT-SERIES THREE-PHASE HYBRID RECTIFIER FOR HEAVY-DUTY ELECTRIC VEHICLE CHARGERS

 MSc thesis of Rui Qiang

This thesis proposes a solution to the HDEV fast charger topologies. Firstly, the state-of-the-art EV fast charging technology, concepts of the hybrid rectifier, and partial power processing (PPP), which could be beneficial in advancing the charging architecture are reviewed. Based on the results of the literature review, a new unidirectional Input-Parallel-Output-Series (IPOS) three-phase hybrid rectifier topology is proposed and analyzed. This topology is derived from the Input-Parallel-Output-Parallel (IPOP) hybrid rectifier in by connecting the DC-links in series instead of in parallel. The IPOS topology is beneficial at ultra-high power rating to interface heavy-duty EV batteries which requires a high and wide output voltage range, enabling the system to deliver an output voltage range of 800$\sim$1500 V to interface the next-generation of EV batteries with available 600/1200V commercial semiconductors. Besides, the proposed topology is efficient, cost-effective, and scalable with the grid input current harmonic components in compliance with the IEEE-519 standard. The benefits of the IPOS topology are supported by circuit derivation, control strategy, analytical modelling, simulation, and experimental verification of the current modulation technique.