Fuzzy power control in PWM voltage-type rectifier

The paper presents a fuzzy logic-based control principle of active and reactive powers in PWM voltage rectifiers. Such a PWM voltage-type rectifier, equiped with the proposed control strategy, may be used advantageously as an active filter to compensate the unsuitable power factor and/or current high harmonics of nonlinear loads connected to the mains. After the description of this control algorithm, results of simulation are presented and compared with those for the direct self control (DSC) strategy of PWM rectifiers, which is another new and promising method. The results of the analysis and simulation performed show that the fuzzy power control method is simple and insensitive to the changes of input filter parameters, while the number of sensors needed is relatively low. The algorithm works well even for small values of input filter inductance and output DC capacitance, and exhibits high dynamic capabilities