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Minimizing the number of active switching devices in switched-mode power-electronic systems has a significant importance. Reduced complexity and switching losses, low cost, weight, and volume and high reliability are the main merits gained from implementing such reduced switch-count systems. To this end, this paper proposes a new three-phase dc-ac power converter topology for diversified applications...
This paper proposes an electrolytic capacitor-less bi-directional EV charger for V2G and V2H operation. The dc-dc converter stage of the proposed EV charger is a non-regulating series resonant converter (SRC) which can be designed with minimum voltage and current rating and always achieves ZCS turn ON and OFF. The unified inner loop of the proposed control block provides seamless mode transfer for...
A battery energy storage system (BESS) for a utility scale photovoltaic (PV) power plant is proposed. PV systems suffer from intermittency and partial shading problems, which could lead to power fluctuations and reduce grid stability. Utilities' inability to service the contracted load might lead to hefty penalties by the regulators. To reduce the effects of intermittency on PV output, a utility scale...
This paper demonstrates a high efficiency, high power density, and fast transient response dc-dc converter design capable of providing a high-voltage isolated output from a low-voltage input. Specifically, we demonstrate two 100 W, 2000 Vdc proof of concept prototype dc-dc converters operating at a switching frequency of 27.12 MHz with input voltages of 40 V and 100 V respectively. Capacitive isolation...
This paper proposes a high-efficiency non-isolated dynamic voltage restorer (DVR) for the parallel-voltage compensation. Compared with the conventional isolated DVR, the non-isolated DVR using the dc-dc converter can reduce cost, weight, size and losses related with the injection transformer. However, the dc-dc converter of the non-isolated DVR operates under hard-switching operation, increasing switching...
Different powertrain topologies have various advantages and disadvantages when used in electric vehicles. In this paper, the efficiencies of two different powertrains are compared. Both designs use a 2 level inverter and a surface mounted Permanent Magnet Synchronous Motor (PMSM). In the first design the inverter is directly powered by a high voltage battery and is operated using traditional pulse-width...
This paper provides a theoretical discussion on energy-balancing control and capability of a modular multilevel cascade inverter (MMCI) based on single-delta bridge cells (SDBC). The SDBC inverter is intended for applications to utility-scale grid-tied photovoltaic (PV) systems involving asymmetric power generation. The distributed nature of electric power generated from individual power sources requires...
The instantaneous output power of the two-stage single-phase inverter pulsates at twice the output voltage frequency, resulting in the second harmonic current (SHC) in the input voltage source and the front-end dc-dc converter. To keep the input voltage source and the front-end dc-dc converter free from the negative effects brought by SHC, special considerations shall be taken on the control scheme...
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