High Performance Improvement of PWM Rectifier using Fuzzy Logic Control
In recent years, the rapid technological evolution experienced by power electronics has made its use very abundant in industrial applications, particularly in the conversion of electrical energy. This conversion is often done using electronic interfaces which are, in the majority of cases, diode rectifiers. This type of interface behaves with respect to the network supply as a non-linear load and the conversion cannot therefore be done without a notable deterioration in the quality of the energy, particularly evident at the level of the forms of energy. The presence of harmonics in the network power supply could, on the one hand, damage the electrical devices connected to it and, on the other hand, cause poor energy quality. It is for this reason that harmonic standards are recommended, such as the IEEE 519 standard, which imposes a maximum limit on THD. Several methods of reducing harmonics exist. These methods are based on passive filters, active filters and PWM rectifiers. The work in this paper presents the modeling, control and simulation of PWM rectifier based on fuzzy logic controller. This strategy is used to eliminate the harmonics distortion, insure unity power factor and to obtain the DC side capacitor voltage constant, while the input currents from the power supply should be sinusoidal and in phase with respective phase voltages. Simulation results are presented and interpreted.
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