Three-Phase Low-Frequency Commutation Inverter for Renewable Energy Systems
Martins, G.M.
Pomilio, J.A.
Buso, S.
Spiazzi, G.
Sch. of Electr. & Comput. Eng., State Univ. of Campinas;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct. 2006
Volume: 53,
Issue: 5
On page(s): 1522-1528
ISSN: 0278-0046
INSPEC Accession Number: 9167379
Digital Object Identifier: 10.1109/TIE.2006.882023
Current Version Published: 2006-10-02
Abstract
The connection of distributed power sources with the utility grid generally needs an electronic power converter for processing the locally generated power and injecting current into the system. If the source provides a dc voltage, the converter must be able to produce a low-distortion high-power-factor ac current. The same aspects related with the voltage and current distortion produced by nonlinear loads can be considered for the injection of power into the grid. In the absence of a specific standard, this paper takes as a reference the limits for current harmonics given by international standards. The justification for this approach is that, from the resulting line voltage degradation, there is no difference between injected and absorbed currents. This paper presents a three-phase inverter using low-frequency commutation. An auxiliary circuit is added to the inverter topology to reduce the output voltage distortion, thus improving the current waveform. The main advantages of this approach are the minimization of the switching losses and the elimination of the electromagnetic interference, which avoids high-frequency filters necessary in high-frequency commutation inverters
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