Adaptive Interval Type-2 Fuzzy Fixed-time Control for Underwater Walking Robot with Error Constraints and Actuator Faults Using Prescribed Performance Terminal Sliding-mode Surfaces

Extensive use of wind turbine (WT) systems brings remarkable challenges to the stability and safety of the power systems. Due to the difficulty and complexity of modeling such large plants, the model-independent strategies are preferred for the control of the WT plants which eliminates the need to model identification. This current work proposes a novel model-independent control methodology in the rotor side converter (RSC) part to ameliorate low voltage ride through (LVRT) ability especially for the doubly-fed induction generator (DFIG) WT. A novel model-independent nonsingular terminal sliding mode control (MINTSMC) was developed based on the principle of the ultra-local pattern. In the suggested controller, the MINTSMC scheme was designed to stabilize the RSC of the DFIG, and a sliding-mode supervisor was adopted to determine the unknown dynamics of the proposed system. An auxiliary dual input interval type 2 fuzzy logic control (DIT2-FLC) was established in a model-independent control structure to remove the estimation error of the sliding mode observer. Real-time examinations have been carried out using a Real-Time Model in Loop (RT-MiL) for validating the applicability of the proposed model-independent control in a real-time platform. To evaluate the usefulness and supremacy of the MINTSMC based DIT2-FLC, the real-time outcomes are compared with outcomes of RSC regulated conventional PI controller and MINTSMC controller.

Download Full-text

Adaptive Fuzzy Modified Fixed-Time Fault-Tolerant Control on SE(3) for Coupled Spacecraft

Mathematical Problems in Engineering ◽

10.1155/2021/6648578 ◽

2021 ◽

Vol 2021 ◽

pp. 1-21

Author(s):

Yafei Mei ◽

Ying Liao ◽

Kejie Gong ◽

Da Luo

Keyword(s):

Motion Tracking ◽

Fault Tolerant ◽

Sliding Mode ◽

Tracking Error ◽

Fault Tolerant Control ◽

Fixed Time ◽

Stability And Convergence ◽

Actuator Faults ◽

Terminal Sliding Mode ◽

Adaptive Fuzzy

This paper aims to solve the control problem of coupled spacecraft tracking maneuver in the case of actuator faults, inertia parametric uncertainties, and external disturbances. Firstly, the spacecraft attitude and position coupling kinematics and dynamics model are established on the Lie group SE(3), and the coupled relative motion tracking error model is derived by exponential coordinates. Then, considering the actuator faults, an adaptive fuzzy scheme is proposed to estimate the lumped disturbances in real time, and a novel modified fixed-time terminal sliding mode fault-tolerant control law is developed to deal with the actuator faults and compensate the lumped disturbances. Next, the Lyapunov method is used to prove the stability and convergence of the system. Finally, the proposed controller can achieve fast and high-precision fault-tolerant control goals, and its effectiveness and feasibility are verified by numerical simulation.

Download Full-text

Fixed Time Control and Synchronization for Perturbed Chaotic System Via Nonsingular Terminal Sliding Mode Method

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.4049561 ◽

2021 ◽

Vol 16 (3) ◽

Author(s):

Haipeng Su ◽

Runzi Luo ◽

Jiaojiao Fu ◽

Meichun Huang

Keyword(s):

Chaotic System ◽

Control Method ◽

Sliding Mode ◽

Sufficient Conditions ◽

Fixed Time ◽

Stability Theorem ◽

Terminal Sliding Mode ◽

Time Control ◽

Definite Integration ◽

Control And Synchronization

Abstract This paper investigates the fixed time control and synchronization of chaotic system in the presence of compound disturbances. By using the definite integration and variable substitution, we present a new fixed time stability theorem for continuous nonlinear systems. In order to offset the bad effects of the compound disturbance, some novel sliding modes are constructed to improve the robustness of the controlled system and error system. For obtaining the robust controllers, some sufficient conditions of fixed time control and synchronization of the chaotic system are proposed by means of the sliding mode control method and the given stability theorem. Numerical simulation results are presented to verify and demonstrate the effectiveness of the proposed schemes.

Download Full-text

Adaptive Fixed-Time Non-singular Terminal Sliding Mode Attitude Stabilization Control for Rigid Spacecraft with Actuator Faults

International Journal of Computer and Electrical Engineering ◽

10.17706/ijcee.2019.11.3.155-163 ◽

2019 ◽

Vol 11 (3) ◽

pp. 155-163

Author(s):

Zhiguo Han ◽

◽

Hui Fu ◽

Fanghao Tian

Keyword(s):

Sliding Mode ◽

Fixed Time ◽

Actuator Faults ◽

Terminal Sliding Mode ◽

Attitude Stabilization ◽

Stabilization Control ◽

Rigid Spacecraft

Download Full-text

Adaptive sliding mode fault tolerant control for interval Type-2 fuzzy singular fractional-order systems

Journal of Vibration and Control ◽

10.1177/1077546320980181 ◽

2021 ◽

pp. 107754632098018

Author(s):

Xuefeng Zhang ◽

Wenkai Huang

Keyword(s):

Fractional Order ◽

Fault Tolerant ◽

Sliding Mode ◽

Fault Tolerant Control ◽

Fractional Order Systems ◽

Sliding Surface ◽

Actuator Faults ◽

Interval Type ◽

Fault Information

This article proposes an integral sliding mode control scheme for a class of uncertain nonlinear singular fractional-order systems subject to actuator faults. The interval type-2 Takagi–Sugeno model is used to represent the singular fractional-order systems. First, a novel integral sliding surface is constructed. A sufficient condition is given in terms of linear matrix inequalities which guarantees the admissibility and the robustness of the singular fractional-order systems against actuator faults. Then, aiming at the fault information which is difficult to get in the practical application, an adaptive estimation of fault information is proposed to update the sliding mode controller. A sliding mode fault tolerant control law is designed to make the singular fractional-order systems reach the sliding surface in a finite time. At last, the applicability and effectiveness of the proposed method is illustrated by a numerical simulation example.

Download Full-text