Comparison of the Trapezoidal Current and Stepped 2-Level Modulation Techniques in Modular DC-DC Converter

  • Firas Abdul-Hadi Salih Electrical Engineering Department, College of Engineering, Mustansiriayah University, Baghdad, Iraq
  • Turki Kahawish Hassan Electrical Engineering Department, College of Engineering, Mustansiriayah University, Baghdad, Iraq
الكلمات المفتاحية: DC-DC converters, DC grids, dual active bridge, trapezoidal current mode

الملخص

For high step-ratio connectivity in direct current (DC) grid applications, a modular (DC-DC) converter (MDCC) has been proposed. To improve the performance of the MDCC, this paper discusses a trapezoidal current modulation (TCM). Com-paring with stepped 2-level modulation where the sub-module (SM) capacitor voltages are balanced with a feedback control loop, TCM ensures  the voltage balancing  by applying an equal duty cycle for each SM in the high voltage stack with-out any additional feedback control. Three-level operation mode featured with large power transmission and high efficiency conversion, based on circulating current analysis and soft-switching performance is introduced. The control schemes of this operation mode is designed to minimize both the SM capacitor voltage ripples and the peak current. An analytical simulation of the MDCC is presented using MATLAB/SIMULINK to explain the operation and discuss the results.

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منشور
2022-09-17
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