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This paper proposes a low voltage ride through (LVRT) scheme for the permanent magnet synchronous generator (PMSG) variable speed wind energy conversion system (WECS) at the grid faults to follow the requirements defined by the grid codes. The dc-link voltage is controlled by the machine-side converter instead of the grid-side converter. Taking into consideration the nonlinear relationship between...
Wind turbines require periodic maintenance procedures to ensure reliable operation of the system. Regular servicing of the rotor demands calibration of the speed and position sensor in aggravated circumstances of the dynamic wind. This sensor is one of the most critical components for the drive reliability and the calibration greatly increases the time of repair. The main focus of the paper is to...
Interleaved boost converters are used in multimegawatt wind energy conversion systems with synchronous generators (SG), after a diode rectifier stage to control the generator and provide voltage elevation for the grid connection at lower speeds. The use of a diode rectifier is possible due to the fact SG do not consume reactive power, making it a cost-effective solution to reduce the size and cost...
Modern, large wind turbines require multiobjective, robust controllers in order to fulfill all the control objectives. In the presented work linear matrix inequality (LMI) approach to H∞ control and linear parameter-varying (LPV) theory are utilized to design multivariable, adaptive controller which aims at improving rotational speed control and at reducing tower structural loads. Designed H∞ pitch...
In this paper, a non-linear model predictive controller (NMPC) is formulated as an objective function aiming to track the rotor speed for a wind turbine. The proposed controller is applied directly to the nonlinear model of wind turbine without the use of any linearization technique. When compared to methods reported in the literature, the simulation results showed that the proposed controller outperforms...
A new integrated mathematical model for the simulation of an offshore wind system having a rectifier input voltage malfunction at one phase is presented in this paper. The mathematical model considers an offshore variable-speed wind turbine on a floating platform, equipped with a permanent magnet synchronous generator using full-power three-level converter to inject energy into the electric network,...
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