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Conversion system of wind energy has become a focal point in the search for renewable energy sources. This article then exhibits a study of the overall operation of a wind generator to provide a constant power or variable the consumer demand while providing services system. In order to provide system services, we consider a variable speed wind turbine coupled to a double-fed induction generator (DFIG) combined with energy storage system. We consider the Flywheel Energy Storage System (FESS) based on fuzzy logic controlled by IM. Due to the use of power converters, the double fed induction generator and the storage system are electrically coupled by a DC bus. Simulation results showing the benefits of using energy storage. [ABSTRACT FROM AUTHOR]

Abstract: This paper proposes an extended direct power control (DPC) for a three-phase PWM multilevel inverter fed by photovoltaic generation system (PVGS) and connected of a grid. The model contains a detailed representation of the main components of the system that are the solar array, and the grid side inverter multilevel inverter NPC VSI. In order to extract the maximum amount of from the photovoltaic generator, we propose an intelligent control method (fuzzy logic controller) for the maximum power point tracking (MPPT) of a PVGS. The DPC approach for multilevel inverter NPC which makes it possible to achieve unity power factor (UPF) operation by directly controlling its instantaneous active and reactive power. The other is a fuzzy logic controller, in the multi-DC-bus voltage control loop, developed to provide active power command. To achieve UPF operation, the reactive power command is set to zero. It is shown via simulation results that the proposed DPC has high performance. Moreover, the controller multi DC bus link voltages based on fuzzy logic has excellent performance in transient and steady states, a good robustness, a good dynamic behaviour response, and a good rejection of impact of load disturbance. [Copyright &y& Elsevier]

Abstract: Tracking of the maximum power point (MPPT) plays an important role in photovoltaic (PV) power systems because they maximize the power output from a PV system for a given set of conditions, and therefore maximize they array efficiency. This work presents a comparative study between different control strategies used most conventional digital namely perturbation and observation (P & O) and incremental Conductance (INC) with digital control by fuzzy logic (FLC). The introduction of fuzzy controller as a solution has given very good performance and whatever the parametric variation of the system. [Copyright &y& Elsevier]