Adel Khedher

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In this paper, one presents a transient state performance optimization of vectorcontrolled induction motor (IM) drives operating in the field-weakening region. The vector control scheme, based on the rotor flux field-orientation (RFOC), is considered to ensure maximum torque motor operation regime. Although in the high speed region, the measure of rotor(More)
In this paper, a backstepping controller of Induction Motor (IM) is proposed using the fifth order model in fixed two frame reference axis with rotor flux and stator currents as state variables. The approach of backstepping requires, generally, that the nonlinear system is in strict feed-back loop. To implement this strategy over the IM, some(More)
This paper presents a loaded SEIG system controlled by a FC-TCR which consists of a big fixed capacitor in parallel with a thyristor controlled reactor in series with a fixed inductance. The output frequency is regulated thanks to the TCR branch by compensating either the excess or the lack of the reactive power system which depends on the load conditions(More)
-In this paper we present a new control structure to extract the maximum power of a wind energy conversion system based on the double fed induction generator (DFIG). The proposed algorithm combines the nonlinear Backstepping approach and the field orientation scheme applied to control the rotor side converter (RSC) and the grid side converter (GSC) of the(More)
The present paper treats the transient and the steady state modeling of an autonomous induction generator, in order to study its transient response as a function of several parameters. A simple method is proposed to determine the adequate excitation needed to reach the rated voltage in standalone operation. The efficiency of the recommended strategy is(More)
This paper investigates and compares four different maximum power point tracking (MPPT) algorithms that are commonly used to improve the efficiency in photovoltaic (PV) systems. These studied algorithms are: the Perturb and observe (P&O) algorithm, the incremental conductance (IC) algorithm, the fuzzy logic (FL) control and the sliding mode control(More)
This paper's object is the control and the observation of an induction motor using sliding mode strategy. Therefore, sliding surfaces are proposed to adjust the speed and the square of the rotor flux magnitude. The observer is used to estimate the rotor flux, because it can't be measured in practice. An adaptive algorithm of the rotor's resistance is(More)
Multilevel inverters are nowadays considered among the most promising power conversion topologies for medium voltages and high power ranges. This work presents a fast space vector modulation algorithm (SVPWM) implemented on a three-phase five-level neutral point clamped (5L-NPC) inverter. The novelty of the proposed algorithm deals with the identification(More)
Smart transformer (ST), which has been classified among the 10 most emergent technologies according to Massachusetts Institute of Technology (MIT), has acquired growing importance in the distribution grid. This paper presents at first the concept of ST and its advantages in the power grid. Then, the existing topologies are reviewed and compared in order to(More)
This paper illustrates the use of an STM32 based digital command to control different types of converters. The process is made by generating signals that manage functionality of the power switchers for each converter. The universal controller allows choosing the desired power converter by means of a mounted micro-switcher.