Abstract:
The Electrical Vehicle (EV) is an obligatory segment is current era, due the shortage of fossil fuel and increasing CO2 emissions. In EV the vehicles drive is consuming more energy than other part of vehicle appliances. The medium voltage EV drives need 400 to 600V DC-link for their full range operation. Hence, the high step DC to DC converter is obvious to required DC-link voltage of the VSI, which is need to give a gain higher range of voltage gain since vehicle battery is only in the arrange of 24 V to 48 V. With this aim a non-isolated DC to DC converter is proposes here for EV VSI drive. The DC to DC converter is operating based on transformer coupled and contains only one capacitor with tightly-coupled 3 winding transformer inductor arrangement. Hence, proposed magnetically coupled DC to DC converter able to provide higher voltage gain varies with different winding factors, and duty cycles. Thus comparing with other existing DC to DC converter, the proposed one has more control degrees of freedom in terms its voltage gain. The converter with lesser energy storage elements, the converter has boosted the DC nearly 12 times. Also it has, and therefore, improving the drive versatility is high. The PWM switching techniques are introduced to this converter fed VSI topology to control drive. The working principle of the proposed transformer based DC to DC Source fed VSI is analysed and simulated using MATLAB/Simulink system software. The laboratory based small scale 200W power circuit is designed and developed and the control algorithm is implemented in PIC microcontroller platform. The Analysis, simulation and experimentation validating the proposed converter fed VSI drive system for EV applications.
