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Wind systems connected to a three-phase voltage grid often experience unbalanced voltage conditions, due to differences in the loads in the grid. This issue is particularly important in wind energy conversion systems (WECS) that use the doubly fed induction generator (DFIG). Therefore, it is important to take into account unbalanced conditions when coupling the wind generator with the grid, especially...
One of the main power quality problems, created in power system, is related the current harmonics generated by nonlinear loads and power electronic equipment. To minimize these effects, different types of compensators have been proposed to increase the electric system quality. Active Power Filter is one of those compensators. This paper deals with the configuration, design, control, and algorithm...
Most industrial applications require high performance speed sensorless operation and demand new control schemes in order to obtain fast dynamic response. In this paper, we present a comparison between MRAS and Luenberger observers based fuzzy logic control SIFLC type. We also present a speed sensorless fuzzy logic control (SIFLC) of induction motor (IM). This command is a powerful tool to reject disturbances...
This paper presents the control of doubly fed induction generator (DFIG) used in the wind energy conversion systems. Maximum power point tracking (MPPT) strategy is used to extract the maximum of power during the conversion and taking care that the system does not exceed the operating limits. This is done by acting on the pitch angle to control the orientation of the turbine's blades. Having regard...
In the era of sustainable development, photovoltaic (PV) technology has shown significant potential as a renewable energy source. Photovoltaic generators (GPV) have a non-linear current-voltage characteristic, with a maximum power point (MPP) characterized by an optimal voltage, and depends on environmental factors such as temperature and irradiation. To extract each time the maximum power available...
This paper proposes a direct power control scheme of a doubly-fed induction generator under wind speed variations. The PI controllers are used to control active and reactive power. A control scheme is developed that uses stator flux orientated vector control. Power transfers are carried out in hyper synchronous and hypo synchronous mode, depending on the generator speed. Back to back converters with...
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