As a perspective to ensure the power system stability and to avoid the vulnerability leading to the blackouts, several preventive and curative means are adopted. In order to avoid the voltage collapse, load shedding schemes represent a suitable action to maintain the power system service quality and to control its vulnerability. In this paper, we try to propose an intelligent load shedding strategy as a new approach based on fuzzy controllers. This strategy was founded on the calculation of generated power sensitivity degree related to those injected at different network buses. During the fault phase, fuzzy controller algorithms generate monitor vectors ensuring a precalculated load shedding ratio in the purpose to reestablish the power balance and conduct the network to a new steady state.

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The electrical supply grids can be the seat of an unbalance of voltage system following the single-phase loads which are connected and which are not uniformly distributed on the three phases.We propose, in the present paper a new approach to control a power system based on a double fed induction generator (DFIG) connected to an electrical grid likely to be affected of an unbalance voltage, via a back-to-back converter (AC/AC). The head aim is to guarantee a better quality of the energy exchanged between the power system and the unbalanced grid.

As a perspective to ensure the power system stability and to avoid the vulnerability leading to the blackouts, several strategies are adopted. In order to avoid the voltage collapse, load shedding schemes represent a suitable action to maintain the power system service quality and to control its vulnerability. In this paper, we propose a new approach of a load shedding strategy based on fuzzy controllers. This strategy was founded on the calculation of generated power sensitivity degree related to voltage level at different network buses. During the fault phase, fuzzy controller algorithms generate monitor vectors ensuring a pre-calculated load shedding ratio in the purpose to reestablish the power balance and avoid the appearance of the collapse phenomenon.