Second-Order Sliding Mode Control for Variable Speed Wind Turbine   Experiment System

In recent years, the complexities of wind turbine control are raised while implementing grid codes in voltage sag conditions. In fact, wind turbines should stay connected to the grid and inject reactive power according to the new grid codes. Accordingly, this paper presents a new control algorithm based on super-twisting sliding mode for a gearless wind turbine by a permanent magnet synchronous generator (PMSG). The PMSG is connected to the grid via the back-to-back converter. In the proposed method, the machine side converter regulates the DC-link voltage. This strategy improves low-voltage ride through (LVRT) capability. In addition, the grid side inverter provides the maximum power point tracking (MPPT) control. It should be noted that the super-twisting sliding mode (STSM) control is implemented to effectively deal with nonlinear relationship between DC-link voltage and the input control signal. The main features of the designed controller are being chattering-free and its robustness against external disturbances such as grid fault conditions. Simulations are performed on the MATLAB/Simulink platform. This controller is compared with Proportional-Integral (PI) and the first-order sliding mode (FOSM) controllers to illustrate the DC-link voltage regulation capability in the normal and grid fault conditions. Then, to show the MPPT implementation of the proposed controller, wind speed is changed with time. The simulation results show designed STSM controller better performance and robustness under different conditions.

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“…1 and 2 are positive constants. By dividing known and unknown terms and taking the derivative of and substituting (19) and (20) in it, we have:…”

Section: D-axis Controllermentioning

confidence: 99%

“…Several papers use the HOSM to enhance LVRT capability in PMSG-based wind turbines [18][19][20]. Nevertheless, all of these works use traditional control of back-to-back converters.…”

Section: Introductionmentioning

confidence: 99%

Super‐Twisting Sliding Mode Control for Gearless PMSG‐Based Wind Turbine

2019

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“…In [13], a second order SMC was designed using an integral manifold for the speed control from the mechanical equation of the permanent magnet synchronous generator-based wind energy system. Other strategies, related to SMC applied to deferent drives and systems, are available in the literature [14][15][16][17][18]. In [19], a feedback linearization was combined with optimization to deal with parametric changes and applied to a pendulum like a robot.…”

Section: Introductionmentioning

confidence: 99%

Cascade Second Order Sliding Mode Control for Permanent Magnet Synchronous Motor Drive

Merabet

2019

Electronics

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This paper presents a cascade second-order sliding mode control scheme applied to a permanent magnet synchronous motor for speed tracking applications. The control system is comprised of two control loops for the speed and the armature current control, where the command of the speed controller (outer loop) is the reference of the q-current controller (inner loop) that forms the cascade structure. The sliding mode control algorithm is based on a single input-output state space model and a second order control structure. The proposed cascade second order sliding mode control approach is validated on an experimental permanent magnet synchronous motor drive. Experimental results are provided to validate the effectiveness of the proposed control strategy with respect to speed and current control. Moreover, the robustness of the second-order sliding mode controller is guaranteed in terms of unknown disturbances and parametric and modeling uncertainties.

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Adaptive Sliding Mode Speed Control for Wind Energy Experimental System

Merabet

2018

Energies

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In this paper, an adaptive sliding mode speed control algorithm with an integral-operation sliding surface is proposed for a variable speed wind energy experimental system. In the control design, an estimator is designed to compensate for the uncertainties and the unknown turbine torque. In addition, the bound of the sliding mode is investigated to deal with uncertainties. The stability of the system can be guaranteed in the sense of the Lyapunov stability theorem. The laboratory size DC generator wind energy system is controlled using a buck-boost DC-DC converter interface. The control system is validated by experimentation and results demonstrate the achievement of favorable speed tracking performance and robustness against parametric variations and external disturbances.

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Second-Order Sliding Mode Control for Variable Speed Wind Turbine Experiment System

Cited by 3 publications

References 10 publications

Super‐Twisting Sliding Mode Control for Gearless PMSG‐Based Wind Turbine

Super‐Twisting Sliding Mode Control for Gearless PMSG‐Based Wind Turbine

Cascade Second Order Sliding Mode Control for Permanent Magnet Synchronous Motor Drive

Adaptive Sliding Mode Speed Control for Wind Energy Experimental System

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