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The hybrid high voltage direct current (Hybrid HVDC) system based on line commutated converter (LCC) and modular multilevel converter (MMC) is a feasible solution for long distance bulk power transmission. In order to handle the dc-side short-circuit fault, two kinds of methods can be adopted. The first one is to replace half-bridge sub-modules (HBSMs) with full-bridge SMs or clamp-double SMs which...
A novel soft-switching single-phase three-arm dynamic voltage restorer (DVR) is analyzed and designed. The proposed soft-switching three-arm DVR which can solve the abnormal voltage problems such as voltage swell, voltage sag, over-voltage, under-voltage and harmonics. The proposed scheme is composed of a three-arm topology which operates as a rectifier and an inverter. Rather than the conventional...
In this paper, a novel soft-switching three-arm series-compensation automatic voltage regulator is proposed. The proposed automatic voltage regulator (AVR) uses a three-arm topology that operates as a rectifier and an inverter. The rectifier arm is switched at high switching frequency, to perform power factor correction and simultaneously transfer the power demand for the load to the DC link capacitor...
A novel four main switches and four auxiliary switches power converter configuration of the three-phase voltage-doubler soft-switching rectifier is proposed in this paper. The reduction in the number of main switches can also increase the reliability because the control circuits and the auxiliary circuits are thereby reduced to two sets. All main switches in the proposed rectifier operate at zero-voltage-switching...
Magnetic amplifier is a simple and high efficiency post regulator in auxiliary output of the multiple output power supplies. The Schottky diodes must be replaced by synchronous rectifiers (SRs) in low voltage output converters to improve the efficiency. In this paper, a new gate-driver scheme is proposed to maximize the efficiency of the synchronous rectifiers combined with magnetic amplifier post...
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