Résumé:
Nowadays, the use of electric and electronic equipments (rectifiers, variable speed drives,
computers, industrial installations) containing power semiconductors such as Thyristor
converters, knows a considerable progression. The nonlinear behavior of those equipments generates harmonics that affect directly the distribution utility operations. Indeed,
the consequences of this phenomenon could be manifested in transformer overheating, a
reduction in the efficiency of the generation, transmission and utilization of electric energy,
malfunctioning of the system or plant components. In order to overcome these problems
and ensure the electrical sources safety several solutions have been presented in the literature. In this work a contribution to improve the electrical energy quality using active
filtering is presented.
The main contribution deals with the calculation of the reference currents in the different conditions, where an algorithm based on the instantaneous power theory to detect and
compensate current harmonics is proposed.
The compromise time response and filtering quality of this filter were discussed. The
direct calculation introduced made it possible to obtain the continuous components in a
time less than 1/20 of the period time correspond to the electrical network with a harmonic
content attenuates to zero. The obtained results show that the contribution brought by this
dissertation gathers between the reduced time response for the calculation of the current
references and the excellent precision.
The introduction of the algorithm proposed in the filtering system (networks, polluting
load and active filter) has met our expectations. The results of simulations and experimentation confirmed the good melting of our contribution.
