Compensation of ripple power required during the$\mathbf{1}-\phi$operation of direct matrix converters needs to be addressed in order to improve their power density, reliability, cost effectiveness, etc. Literature survey reveals that compensation strategies relevant to matrix converters are usually implemented either at the low frequency AC side of the matrix converter or at the DC port side. In such cases, the entire ripple power needs to be handled by the compensation block, thereby effecting metrics such as voltage or current stresses, losses, power density, etc. In view of this, two circuits are described in this paper that perform active ripple power compensation of direct matrix converter based isolated bidirectional AC-DC converters while handling a fraction of the actual ripple power. The compensation circuits are operated at the high frequency link of the AC-DC converter on the DC port side. Relevant explanation of the working principle of the topologies are given, and simulation results for a 3.45$\mathbf{kW}$electric vehicle charger, with a 230 V (RMS) AC grid input, feeding a 400 V battery are presented to illustrate the findings.

Proper selection of hardware parameters and modulation variables is critical to ensure optimal performance of dual active bridge (DAB) converters. While several optimization approaches of DAB converters exist in literature, the impact of the operation profile pertinent to the application where a converter is employed is seldom considered. Towards this end, this paper describes the methods of adopting a mission profile based approach for designing DAB converters. Optimal converter parameters are identified via numerical optimization, which are then used in simulation for validation. Results obtained by the mission profile based design are compared with that for the single operating point based design for three specific application scenarios. The comparative analysis highlights the applicability of the proposed mission profile based design strategy for a DAB converter based on its operational requirements and profile.

This paper provides a comprehensive analysis of various state-of-the-art modular, bi-directional, isolated power converters for high-power (300 kW - 1 MW) applications like fast EV chargers which are directly interfaced to the medium voltage (MV) grid to increase the system efficiency. Traditional low-frequency transformers increase the size, weight, and cost of the overall installation of the EVs to the MV grid interface. As an alternative, various high-frequency modular converter topologies are used which provide a more compact solution. A typical design case study is considered for a 500 kW modular converter system, intended for a fast EV charger. Multiple topologies are evaluated in this study, considering key factors like efficiency, DC-link capacitor size, and overall device and capacitor cost. A thorough performance comparison is carried out by designing the isolated DC-DC stage of all the topologies using a conduction-loss minimization-based optimization approach.

This paper discusses the operation of a new battery-integrated high-frequency-isolated PV inverter. The working principle of the circuit is similar to the triple-active-bridge converter, wherein power-flow at two of the three ports can be regulated by variation of phase-shifts between the three synthesized high-frequency ac voltages. ZVS operation of most devices and an electrolytic capacitor-free implementation are two key advantages of the proposed solution. Operation of the circuit in different modes is verified through simulation studies and experimental tests performed on a 300 W, 110 V rms laboratory prototype, intended for operation with a 25-35 V PV module and a 12 V battery.