Comparative Evaluation of SPS and EPS Based Dual Active Bridge Converter Based on Transistor-Clamped H-Bridge Inverter

The multilevel inverter (MLI) is a tested technology for controlling electrical machinery, integrating renewabIes into the grid and filtering active power. Recent developments indicate innovative attempts to attain the output voltage levels that increased with the fewest active device counts and active device ratings. This paper offers a new H Bridge multi-level inverter family with a transistor clamp to maximize the output voltage levels. The suggested topology provides any number of voltage levels, significantly reducing the number of circuit components, particularly active switches. Consequently, the system's reliability improves. An isolated dual active bridge with bidirectional power flow property is a critical element of a low voltage distribution network. Dual active bridges are typically operated with an approach of single-phase shift control. Its performance is efficient during the unity voltage conversion ratio, but efficiency starts decreasing when our voltage ratio differentiates from unity and stress in current starts increasing due to the requirement for more reactive power. Furthermore, In a high-frequency transformer, the voltage obtained due to single-phase shift control at the primary side is only two levels which causes the increased voltage stress across the switches. This paper suggests the TC-dual active bridge DC-DC converter with three degrees of freedom, enhancing the DAB converter's ability to regulate power flow. The primary side of the converter current stress in switches is effectively reduced due to the incorporation of a 5-level voltage when using a high-frequency transformer. Besides phase shift control, the proposed converter contains two additional control parameters that improve the converter's power flow controllability. It is more efficient than the traditional two-level DAB. MATLAB/Simulink software simulation validates the proposed converter's performance.