Study Of SiC Based Three-level DC-DC MVDC Converter

DC power generation from renewable sources,as well as the current relocation of loads from AC to DC,Medium Voltage(MVDC)should fill the gap in the areas of distribution.Improving energy efficiency.MVDC system is a platform for the interconnection of renewables electric power generation(Solar,wind)through loads such as industrial facilities,data centers,and EV stations(also using MVDC technology).DC-DC power converters are part of the rising technology for interconnecting the future DC-grids,providing good controllability,stability and bi-directional power flow.This study presents an efficient DC/DC converter topology,based on rigorous control strategy of MVDC distribution system.The converter is capable and effective of over a wide frequency range,high operation with a unity power factor using high frequency transformers.This study describes an effective control strategy for Three-level DC/DC convertor with a double closed control loop control technique,inner current loop control and outer voltage control loop is realized,and an efficient DC-DC convertor for Higher Power transmission among DC power grids.The main topology of the proposed DC/DC convertor are as follows:1)provides constant output even if the load is changed or sudden changes in output voltages,2)variable output,making it suitable for high-voltage applications.The conditions of load disturbance,and uncertain disturbance are also been taken into account while designing the controllers.Developing a new control for the reason of dc-link voltage fluctuations are analyzed for a back-to-back SVPWM convertor by using MATLAB/Simulink.Simulation results demonstrate the performance and effectiveness of the proposed control method.In second phase of this study,a comparison evaluation of new wide-band gap semiconductor devices SiC and Si is performed by using LT-spice software,power losses efficiency improvement and overall comparison are discussed briefly.