Wind energy integration: Dynamic modeling and control of DFIG based on super twisting fractional order terminal sliding mode controller

AbstractThis paper presents a novel composite wide area control of a DFIG wind energy system which combines the Robust Exact Differentiator (RED) and Discontinuous Integral (DI) control to damp out inter-area oscillations. RED generates the real-time differentiation of a relative speed signal in a noisy environment while DI control, an extension to a twisting algorithm and PID control, develops a continuous control signal and hence reduces chattering. The proposed control is robust to disturbances and can enhance the overall stability of the system. The proposed composite sliding mode control is evaluated using a modified benchmark two-area power system model with wind energy integration. Simulation results under various operating scenarios show the efficacy of the proposed approach.

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Fractional-order nonsingular terminal sliding mode control via a disturbance observer for a class of nonlinear systems with mismatched disturbances

Journal of Vibration and Control ◽

10.1177/1077546320925263 ◽

2020 ◽

pp. 107754632092526

Author(s):

Amir Razzaghian ◽

Reihaneh Kardehi Moghaddam ◽

Naser Pariz

Keyword(s):

Nonlinear Systems ◽

Sliding Mode Control ◽

Fractional Order ◽

Finite Time ◽

Disturbance Observer ◽

Sliding Mode ◽

Sliding Mode Controller ◽

Terminal Sliding Mode Control ◽

Terminal Sliding Mode ◽

Nonsingular Terminal Sliding Mode

This study investigates a novel fractional-order nonsingular terminal sliding mode controller via a finite-time disturbance observer for a class of mismatched uncertain nonlinear systems. For this purpose, a finite-time disturbance observer–based fractional-order nonsingular terminal sliding surface is proposed, and the corresponding control law is designed using the Lyapunov stability theory to satisfy the sliding condition in finite time. The proposed fractional-order nonsingular terminal sliding mode control based on a finite-time disturbance observer exhibits better control performance; guarantees finite-time convergence, robust stability of the closed-loop system, and mismatched disturbance rejection; and alleviates the chattering problem. Finally, the effectiveness of the proposed fractional-order robust controller is illustrated via simulation results of both the numerical and application examples which are compared with the fractional-order nonsingular terminal sliding mode controller, sliding mode controller based on a disturbance observer, and integral sliding mode controller methods.

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Observer Based Fuzzy Terminal Sliding Mode Controller Design for a Class of Fractional Order Chaotic Nonlinear Systems

International Journal of Engineering ◽

10.5829/idosi.ije.2016.29.11b.11 ◽

2016 ◽

Vol 29 (11) ◽

Keyword(s):

Nonlinear Systems ◽

Fractional Order ◽

Controller Design ◽

Sliding Mode ◽

Sliding Mode Controller ◽

Terminal Sliding Mode

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Robust finite-time controller for damping of subsynchronous resonance in doubly fed induction generator wind farm

Journal of Vibration and Control ◽

10.1177/1077546320924490 ◽

2020 ◽

pp. 107754632092449

Author(s):

Penghan Li ◽

Jie Wang ◽

Linyun Xiong ◽

Meiling Ma ◽

Muhammad W Khan ◽

...

Keyword(s):

Fractional Order ◽

Wind Farm ◽

Sliding Mode ◽

Induction Generator ◽

Sliding Mode Controller ◽

Terminal Sliding Mode Control ◽

Doubly Fed Induction Generator ◽

Terminal Sliding Mode ◽

Subsynchronous Resonance ◽

Doubly Fed

To alleviate subsynchronous resonance in doubly fed induction generator–based wind farm, this study devises a robust nonlinear control for a rotor-side converter based on a fractional-order sliding mode controller. The designed fractional-order sliding mode controller is able to realize finite-time control and reduce the control time compared with terminal sliding mode control, which contributes to the faster mitigation of subsynchronous resonance. Impedance-based analysis and transient simulation are carried out to evaluate the performance of the fractional-order sliding mode controller compared with terminal sliding mode control and subsynchronous damping control. Simulation results verify that the fractional-order sliding mode controller is able to damp SSR within shorter time and effectively reduce the fluctuation range of a system’s transient responses under various working conditions of compensation degrees and wind speeds. Furthermore, the fractional-order sliding mode controller enhances the robustness under external disturbance and parametric uncertainty, ensuring safe operation of the practical wind farm.

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Fractional-order adaptive controller for chaotic synchronization and application to a dual-channel secure communication system

Modern Physics Letters B ◽

10.1142/s0217984919502907 ◽

2019 ◽

Vol 33 (24) ◽

pp. 1950290 ◽

Cited By ~ 4

Author(s):

Ye Li ◽

Haoping Wang ◽

Yang Tian

Keyword(s):

Fractional Order ◽

Communication System ◽

Secure Communication ◽

Sliding Mode ◽

External Disturbance ◽

Lyapunov Stability Theory ◽

Adaptive Controller ◽

Sliding Mode Controller ◽

Terminal Sliding Mode ◽

Dual Channel

A novel fractional-order adaptive non-singular terminal sliding mode control (FONTSMC) method is investigated for the synchronization of two nonlinear fractional-order chaotic systems in the presence of external disturbance. The proposed controller consists of a fractional-order non-singular terminal sliding mode surface and an adaptive gain adjusted with sliding surface. Based on Lyapunov stability theory and stability theorem for fractional-order dynamic systems, the controlled system’s stable synchronization is guaranteed. A dual-channel secure communication system is presented to transmit useful signals based on the proposed synchronization controller. Finally, numerical simulations and comparison with fractional-order PID controller, fractional-order PD sliding mode controller and adaptive terminal sliding mode controller are given to demonstrate the effectiveness and the robustness of the proposed FONTSMC control. The application of the proposed synchronization method is studied in the dual-channel secure communication.

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