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The paper presents a comprehensive approach to the compensation of the grid current distortion for shunt active power filter systems. Four different sources of current distortion are addressed: imperfect grid synchronization caused by the distortion in the grid voltages, time delays in the estimation of compensating currents and grid voltages, fluctuations of the dc bus voltage, and the distortion...
The paper presents a comprehensive approach to the compensation of phase current distortion of grid-connected power inverters. Four different sources of current distortion are addressed: imperfect grid synchronization caused by the distortion in the grid voltages, voltage fluctuations in the dc link, time delays in the estimation of grid voltages, and the distortion of inverter output voltages due...
The paper puts forth a novel idea for the computation of Nearest Three Virtual Space Vector Pulse Width Modulation for the three level NPC converters. The computations are based on the concept of final element shape function widely used in the domain of finite element analysis. The proposed approach significantly frees the computations from the use of trigonometric functions, which simplifies the...
A simple model is derived and verified for evaluating the effect of parasitic capacitances on the dead-time related voltage distortion in multilevel NPC voltage source inverters. The model permits well-defined and precise compensation of dead-time distortion, exhibiting meaningful improvement on compensation methods neglecting the effects of parasitic capacitances. A simple formula is given for evaluating...
The objective of this paper is to present the method of estimation of the acoustic noise emitted by permanent magnet synchronous motor. The presented method is based on multi-physical model: electromagnetic, mechanical and acoustic which is used to determine the electro-acoustic transmittance of the considered machine. This method enables to predict the acoustic noise of the electromagnetic origin...
A method is presented and discussed whereby to evaluate two basic diagnostic variables that can be used in the assessment of the health of high-power IGBT packs. The proposed approach attempts to adapt a laboratory-grade method known from the literature for the use on board electric traction vehicles. The diagnostic variables in question are the junction-to-case thermal resistance and the collector-emitter...
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