[Show abstract][Hide abstract] ABSTRACT: This paper describes two evolutionary algorithms for the optimized harmonic stepped–waveform technique. Genetic algorithms and particle swarm optimization are applied to compute the switching angles in a three-phase seven-level inverter to produce the required fundamental voltage while, at the same time, specified harmonics are eliminated. Furthermore, these algorithms are also used to solve the starting point problem of the Newton-Raphson conventional method. This combination provides a very effective method for the harmonic elimination technique. This strategy is useful for different structures of seven-level inverters. The diode-clamped topology is considered in this study.
Electric Power Systems Research 10/2008; · 1.60 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: This paper proposes a new indirect adaptive fuzzy controller based on interval type-2 fuzzy logic systems for indirect vector controlled induction motor drive. Type-2 fuzzy controller compared with type-1 fuzzy controller, has the advantage that it can take into account the linguistic uncertainties present in the rules of the estimated models. The proposed control scheme consists of a combination of two controllers: a type-2 fuzzy controller and a supervisory controller. The supervisory controller is used when the system loop tend to be unstable. The tuning parameters for the type-2 fuzzy controller will change according to some learning algorithms based on Lyapunov theorem.
Systems, Signals and Devices, 2008. IEEE SSD 2008. 5th International Multi-Conference on; 08/2008
[Show abstract][Hide abstract] ABSTRACT: This paper describes a new control method for the integrated of six current rectifiers—seven-level diode-clamped inverter
feeding induction motor considering dc-link capacitors voltage balancing problem. The proposed controller uses type-2 fuzzy
systems to compensate the fluctuations of capacitors voltage, draw a sinusoidal line current with nearly unity power factor,
and ensure the motor speed control. The performance of dc-link voltages control is evaluated in comparison to the conventional
PI control scheme. The overall system and the control algorithm are presented and a set of simulations is carried out in order
to prove the good performances of the proposed solution.