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  1. This paper investigates the use of power semiconductor devices in a nine - level cascaded H-bridge (CHB) multilevel inverter topology with an integrated battery energy storage system (BESS) for a 13.8kV medium voltage distribution system. In this topology, the bulky conventional step-up 60 Hz transformer is not used. The purpose of this study is to analyze the use of SiC MOSFET and Si IGBT devices in the inverter system to evaluate their respective performances. SiC MOSFET and Si IGBT switching devices are modeled and characterized using Saber® modeling software. The switching losses, thermal performance, and efficiency of the inverter system are investigated, and measurements are obtained from the simulation. Saber® provides a good capability for characterizing semiconductor models in the real world, with great features of computation. A three-phase SiC power MOSFET-based multilevel CHB inverter prototype is presented for experimental verification. In the investigation, better performances of SiC MOSFET devices are recorded. SiC devices demonstrate promising performance at different switching frequency and temperature ranges.
  2. This paper describes the study of a topology of modular multilevel converters for integrating battery energy storage into a medium (13.8 kV) distribution system. The main benefit of this topology is to remove the need for a bulk 60 Hz transformer that is normally used to step up the output of a voltage source inverter to the medium voltage level. A SiC-based power electronics interface presented in this paper provides an efficient solution without the large and costly transformer. Using medium voltage SiC devices (≥ 10 kV SiC MOSFETs), with their high breakdown voltage, enables the system to meet and withstand medium voltage application, using a minimized number of cascaded modules. This SiC-based power electronics interface significantly reduces the complexity usually faced when Si devices are used directly in medium voltage applications. The voltage and state of charge balancing control for battery modules is also simplified and performs well. The simulation and experimental results, performed on a low-voltage prototype, verify the proposed topology that is presented in this paper.
  3. To address power quality issues in the residential split-phase distribution systems, a novel residential power router (RPR) is proposed in this paper. It consists of a dual-half bridge (DHB) converter and a split-phase inverter. The DHB provides the galvanic isolation and bidirectional power flow channel for the distributed generation terminal. The split-phase inverter can work as the active power filter, the reactive power compensator, and balance the power of two phases. The power balancing mode is critical to a residential microgrid, especially when the utility grid is not accessible. A proportional quasi-resonance and resonance (PQRR) controller is adopted to eliminate the steadystate error for harmonics compensation. Simulation and experimental results are presented in this paper to validate the feasibility and effectiveness of the proposed RPR for residential applications.