The paper is related to the problem of generating the high quality AC voltage waveforms using multilevel converters. This technique can be applied especially in the distributed power energy systems with renewable DC voltage sources like photovoltaic farms and fuel cells. A novel approach to the synthesis of AC voltage waveforms, considering minimising of THD by use of analytical methods like Fourier transform is presented. The analysis of the obtained waveforms is presented as well as examples of chosen parameter optimisation. The meaning of the THD factor from the construction point of view is analysed and a new bandwidth factor THD B , containing more information about the frequency range of harmonic components is proposed in the paper.
The paper presents an approach to the useful theory concerning the problem of generating high quality AC voltage and current waveforms in multilevel converters. The objective is to describe a novel proposal of AC waveforms synthesis based on applying analytical methods using sets of orthogonal wavelets. The discussion includes a short survey of Haar wavelet and a proposal of output waveforms synthesis based on wavelet transform. The comparison of the proposed method with standard solution is discussed. It has been done by use of such criteria as: average square error and total harmonic distortion (THD).
The paper presents a case study on development of the high power compensator of the power grid irregularities. The compensator is dedicated for sensitive industrial installations protection against dips, sags and short duration interruptions in public power network. The energy for compensation will be stored in bank of high voltage stacked supercapacitors. The development of the new high power medium voltage compensator will be based on experience gained during the realisation in The Electrotechnical Institute Gdansk Branch a similar medium power low voltage device. The study includes: main power converter topology considerations with some preliminary simulation results including harmonic components discussion, the solution to the problem of fast identification of the grid voltage disturbances, the solution to the problem of compensator waveforms synchronization with the grid and the description of the main operational algorithm of the compensator.
The paper is related to the problem of generating the high quality AC voltage waveforms in distributed power generating systems with DC voltage sources like photo-voltaic farms and fuel cells. A novel approach to the synthesis of AC voltage waveforms, applying chosen analytical methods like Fourier transform, Haar wavelets transform and orthogonal vectors method, is discussed. The simulation and experimental results for the proposed complex convertor's structures are presented in the paper.
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