Technical Challenges and Solutions of a three-phase bidirectional two stage Electric Vehicle charger

The sustainability of the power grid owing to the building strain of the ever-growing demand for electrical energy urges innovative and more practical solutions that enable active participation of end-users in stable and reliable management of power systems. One of the emerging projections of such a two-way exchange of electrical power between the grid and consumers is the developing field of bidirectional energy trade between power providers and electric vehicle owners. A bidirectional, three-phase, two-stage off-board electric vehicle EV charger design is proposed in this research. The first stage acts as alternating current AC to direct current DC converter during charging operation and behaves as three phase inverter and power factor corrector when energy exchange is from vehicle to grid. The second stage is a bidirectional DC-DC level converter linked to the first stage by a DC bus. The grid side filter is designed to enable the grid interfacing without any significant power quality problems. The proposed design, topology and the devised control infrastructure are tested through simulations on MATLAB/Simulink platform by interfacing the charger to a three-phase AC microgrid and the results approve the performance of the proposed charging topology

Study & Analysis of Power Switches with reverse voltage blocking capability

This thesis hovers over the basic introduction to Silicon Carbide (Metal Oxide Semiconductors Field-effect Transistor) MOSFET switches and the circuit designing of Current Source Invertors using SiC MOSFET switches. The thesis covers the basic grounds for all the steps needed in the implementation of hardware design for half bridge, full bridge and three phase CSIs in the future. Firstly, a detailed literature review is presented to give a deep knowledge about the importance and advantages of using SiC switches and CSIs. Furthermore, a comparison is taken between half bridge and full bridge voltage source converters alongside half and full bridge CSIs using (Physical security information management) PSIM software to model the circuits and analyze different aspects with respect to efficiency of both type of converters. The converters are compared with respect to different input voltages, frequency, and power. Afterwards, a fully working three phase Current Source Inverter is designed using Simulink platform and tested on different frequencies and the results are shown with the outputs of current and voltage waveforms. In the next step Simulations for the PCBs of half bridge, full bridge and three phase CSIs are simulated using LTspice software and examined with the desired output and then are designed in Easy EDA software ready to be printed. Lastly, an additional objective is achieved by testing the Cree's N-channel 3rd generation SiC MOSFETs (C3M0040120K) with Cree's gate driver CGD15SG00D2SiC in simple hardware circuits to observe their basic behavior. The results are shown using oscilloscope graphs against different voltages and currents. The whole dissertation is about the SiC switches, their working, specifications, usage, CSIs, and a lot more with simulations

Study & Analysis of Power Switches with reverse voltage blocking capability

This thesis hovers over the basic introduction to Silicon Carbide (Metal Oxide Semiconductors Field-effect Transistor) MOSFET switches and the circuit designing of Current Source Invertors using SiC MOSFET switches. The thesis covers the basic grounds for all the steps needed in the implementation of hardware design for half bridge, full bridge and three phase CSIs in the future. Firstly, a detailed literature review is presented to give a deep knowledge about the importance and advantages of using SiC switches and CSIs. Furthermore, a comparison is taken between half bridge and full bridge voltage source converters alongside half and full bridge CSIs using (Physical security information management) PSIM software to model the circuits and analyze different aspects with respect to efficiency of both type of converters. The converters are compared with respect to different input voltages, frequency, and power. Afterwards, a fully working three phase Current Source Inverter is designed using Simulink platform and tested on different frequencies and the results are shown with the outputs of current and voltage waveforms. In the next step Simulations for the PCBs of half bridge, full bridge and three phase CSIs are simulated using LTspice software and examined with the desired output and then are designed in Easy EDA software ready to be printed. Lastly, an additional objective is achieved by testing the Cree's N-channel 3rd generation SiC MOSFETs (C3M0040120K) with Cree's gate driver CGD15SG00D2SiC in simple hardware circuits to observe their basic behavior. The results are shown using oscilloscope graphs against different voltages and currents. The whole dissertation is about the SiC switches, their working, specifications, usage, CSIs, and a lot more with simulations

Technical Challenges and Solutions of a three-phase bidirectional two stage Electric Vehicle charger

The sustainability of the power grid owing to the building strain of the ever-growing demand for electrical energy urges innovative and more practical solutions that enable active participation of end-users in stable and reliable management of power systems. One of the emerging projections of such a two-way exchange of electrical power between the grid and consumers is the developing field of bidirectional energy trade between power providers and electric vehicle owners. A bidirectional, three-phase, two-stage off-board electric vehicle EV charger design is proposed in this research. The first stage acts as alternating current AC to direct current DC converter during charging operation and behaves as three phase inverter and power factor corrector when energy exchange is from vehicle to grid. The second stage is a bidirectional DC-DC level converter linked to the first stage by a DC bus. The grid side filter is designed to enable the grid interfacing without any significant power quality problems. The proposed design, topology and the devised control infrastructure are tested through simulations on MATLAB/Simulink platform by interfacing the charger to a three-phase AC microgrid and the results approve the performance of the proposed charging topology