Type: Technical Lecture Series
Title: Innovation in low-carbon vehicle technologies- vehicle to grid (V2G) systems and integrated power train solutions
Speaker: Dr Rishad Ahmed, PhD
Date: 5th March 2018
Time: 17:30 – 18:30
Location: C24, Sackvillle Street Building, Manchester M13 9PL
Free Refreshments will be provided for all attendees.
There has been a strong growth in the electric vehicle (EV) market in recent years with the global stock reaching two million in 2016. UK also expects two million EVs to be sold by 2022. The affiliated charging events would exceed the peak power capability of the grid if we continue using conventional unidirectional charging facility. Vehicle-to-Grid (V2G) technology is the key to reduce the peak power demand, reinforce the reliability and capability of the grid, and could achieve a step of twice charging capability based on similar level of infrastructures. However, development of a compact V2G on-board charger is very challenging due to various thermal, mechanical and reliability issues. Also for experimental verifications a back-to-back powering circuit rig needs to be built and the grid needs to be emulated by a fully-controlled converter to mimic grid faults and transient conditions. The first part of the session will explore the EV charging standards, design specifications, market trends and segmentations, and integrated converter topologies for modular level 1 (single-phase) and level 2 (three-phase) V2G on-board chargers.
Automotive industry is moving towards more integrated solutions to increase the power density and reduce the specific costs of EV power train solutions. The specific costs for commercially available inverters, converters and electric machines are much higher than the target ($5-$10 / kW) set by the Automotive Council UK. Three specific technologies being developed by Dynex to tackle the current automotive power electronics challenges will be covered in the second part of the presentation. These are: (i) double-sided cooling of IGBT and Si-SiC hybrid modules, (ii) integrated inverter-machine for the EV power train and (iii) integrated inverter-converter system for the EV traction drive and low-voltage power supply. Experimentally obtained illustrations of the operation along with the results from electrical, thermal and mechanical simulations will be provided to explain the technologies.
Rishad Ahmed received the B.Sc. degree in electrical and electronics engineering from the Bangladesh University of Engineering and Technology, Dhaka, Bangladesh, in 2011 and the M.Sc. degree in electrical energy conversion systems (with distinction) in 2013 from the University of Manchester, Manchester, UK, where he had been working toward the Ph.D. degree in power electronics up until 2017. He is currently working as a design engineer at the EV R&D group of Dynex Semiconductor which is a leading manufacturer of power semiconductor devices, assemblies and systems based in Lincoln, UK.
Rishad has extensive R&D experience on design and development of high-frequency converters, wideband-gap (WBG) semiconductor device applications, and modelling of power electronics systems. His core skills are WBG device modelling, packaging, soft switching converter design and control, and developing compact fabrication methods for power electronic circuits.
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