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High-Efficiency, Medium-Voltage-Input, Solid-State-Transformer-Based 400 kW/1000 V/400 A Extreme Fast Charger for Electric Vehicles
TYPE: PROJECT
Document Tags: 2018, 2019, 2020, 2021
PIs: Qiang Li
Sponsors: Delta Products Corporation (U.S. Department of Energy)
ABSTRACT
CPES is working with Delta Products Corporation, General Motors, DTE Energy, Next Energy, Michigan State Energy Office, and the City of Detroit Sustainability Office to deliver a novel, efficient, compact, and scalable Solid-State Transformer (SST) based 400-kW Extreme Fast Charger (XFC). The proposed system will also provide a user-friendly DC interface to renewable energy generation systems (e.g., PV) and Energy Storage Systems (ESS), resulting in less disturbance to the existing grid. It is the enabling technology for large-scale XFC deployment. It will also accelerate the electric vehicle (EV) market penetration and promote renewable energy usage. The proposed 400 kW/1000 V/400 A XFC consists of two main function blocks: an SST and a Charger Converter. The SST takes a 13.2 kV AC medium-voltage (line-to-line) and converts into a 1 kV intermediate DC bus voltage. The Charger Converter converts the 1 kV DC bus into the controllable DC-output voltage to charge an EV. The 1 kV intermediate DC bus is designed to interface with external renewable energy generation system (e.g., PV) and Energy Storage System (ESS) for load shaving and minimizing the demand charge. The bulky line frequency transformer (LFT) is eliminated in the proposed SST based XFC system.
