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A truly distributed and autonomous control strategy is proposed for the FREEDM System-a power electronics based distribution grid. The proposed control strategy requires no communication between and among all grid assets. By utilizing available local quantities (V, f) as a way to communicate among all connected devices, the strategy contains a novel dual droop control loops between the medium voltage...
In this paper, three existing distributed PV system configurations are reviewed and compared in depth. A novel ultra-high-frequency-AC (UHFAC) PV system for residential application is proposed. Compared with traditional DC parallel PV systems, this new approach eliminates the high voltage DC bus by replacing it with UHFAC bus, which avoids the DC arcing fault and enables ultra-fast short circuit protection...
Plug-in hybrid electric vehicles (PHEVs) have two energy inputs, the petroleum fuel and electric energy from the utility grid. Due to the different operation costs, the energy management has significant effects on the fuel economy. In this paper, an energy management strategy, stemmed from the AER-focused and blended strategy, is developed. It features the “smart” utilization of the stored electric...
This work presents a piecewise two-dimensional steady-state analytical model for insulated gate bipolar transistor (IGBT). The proposed model can accurately describes the dependence of carrier density profile on the ratio of accumulation gate width (Lg) to the half cell width (Lcell) without ignoring the recombination in the drift region. The drift region of IGBT is divided into four regions in this...
This letter introduces a new and energy-efficient gate drive circuit for emitter turn-off thyristor (ETO). The proposed circuit is a buck converter with two controllers that obtains power from gate current when the ETO gate voltage is negative, thus reducing power dissipation of the ETO gate drive and significantly mitigating a limitation of current ETO self-power designs. Various on-state gate current...
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