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In this paper, a modulation technique is proposed by combining selective harmonic elimination (SHE-PWM) and an optimized procedure with genetic algorithms (GA). The purpose is to mitigate individual harmonic components (5th, 7th, 11th, 13th), reduce total harmonic distortion (THD%), control the amplitude modulation index (ma) and frequency of the output fundamental component, while complying with...
In this paper methodologies for analysis of power switching losses in SiC MOSFETs are evaluated by means of PSpice simulations. Besides, an optimized piecewise linear method to calculate those losses is proposed. Results and discussions are presented as an aid for assessing the performance of power electronics converters based on SiC MOSFETs.
This paper presents novel control algorithms for a transformerless hybrid active filter without current sensors. The hybrid active filter is composed of a shunt active filter in series with a passive filter tuned nearby 5th harmonic frequency. This structure allows reducing the DC-Link voltage, which is very important when the connection of hybrid active filters to power grids at medium voltage level...
This work presents a topology for a Unified Power Quality Conditioner (UPQC), without series transformers, connected to a three-phase four-wire electrical grid. Based on the proposed power topology, the UPQC is able to compensate unbalanced-and harmonic-components, power factor and short-duration voltage variations (voltage sag/swell). In other words this UPQC consists in a universal solution capable...
In this paper a new multilevel power conversion concept is proposed, whereby an additional auxiliary circuit composed of multilevel clamping cells is applied to a main DC-AC converter. The resultant structure, the multilevel-clamped multilevel converter, or simply multilevel-clamped converter (MLC2), has the number of levels increased, while keeping circuitry simple, wherein the number of parts count...
In some applications, photomultiplier tubes (PMTs) are powered by battery based circuits, where the available energy is severely limited. The most simple approach to design high voltage power supplies (HVPS) for PMTs has considered resistive voltage dividers in order to bias the dynodes. However, this approach usually results in high power losses and, consequently, this undermines the PMT performance...
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