scholarly journals Adaptive Robust Dynamic Surface Integral Sliding Mode Control for Quadrotor UAVs under Parametric Uncertainties and External Disturbances

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Ye Zhang ◽  
Ning Xu ◽  
Guoqiang Zhu ◽  
Lingfang Sun ◽  
Shengxian Cao ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Tracking Performance ◽  
Parametric Uncertainties ◽  
External Disturbances ◽  
Dynamic Surface ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Quadrotor Uavs

A robust adaptive fuzzy nonlinear controller based on dynamic surface and integral sliding mode control strategy (ADSISMC) is proposed to realize trajectory tracking for a class of quadrotor UAVs. In this study, the composite factors including parametric uncertainties and external disturbances are added to controller design, which make it more realistic. The quadrotor model is divided into two subsystems of attitude and position that make the control design become feasible. The main contributions of the proposed ADSISMC strategy are as follows: (1) The combination of dynamic surface and integral sliding mode makes the system always in sliding stage by finding the appropriate initial position compared with the common sliding mode, and the complexity of explosion in backstepping method is eliminated. (2) By introducing the fuzzy system, the unknown functions and uncertainties can be approximated which significantly improves the robustness and the tracking performance. (3) The switching control strategy is utilized to compensate for the errors between estimated and ideal inputs; the tracking performance of the whole system has been significantly improved. The simulation results show the effectiveness of the proposed control method.

scholarly journals Integral Sliding Mode Control Strategy of D-STATCOM for Unbalanced Load Compensation under Various Disturbances

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Mingchao Xia ◽  
Yanhui Mao
Keyword(s):  
Sliding Mode Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Control Strategies ◽  
External Disturbances ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Load Compensation ◽  
Mode Control ◽  
Unbalanced Load

Control strategies of D-STATCOM for unbalanced load compensation under internal and external disturbances were discussed. Linear control strategies do not have a satisfactory dynamic performance and become invalid under internal or external disturbances. To guarantee a good precision and robustness, a control strategy combining input-output feedback linearization technique with integral sliding mode control (ISMC) method was applied to D-STATCOM for unbalanced load compensation. The strategy has features of simple structure and is easy to implement. A 10 MVar/10 kV D-STATCOM simulation system was built in PSCAD/EMTDC to verify the effectiveness and robustness of the control strategy proposed. Simulation results show that the control strategy can compensate reactive power and eliminate unbalance simultaneously under various disturbances.

Adaptive fault tolerant control of dissimilar redundant actuation system of civil aircraft based on integral sliding mode control strategy

2019 ◽  
Vol 41 (13) ◽  
pp. 3756-3768 ◽  
Author(s):  
Salman Ijaz ◽  
Mirza Tariq Hamayun ◽  
Lin Yan ◽  
Hamdoon Ijaz ◽  
Cun Shi
Keyword(s):  
Sliding Mode Control ◽  
Control Strategy ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Fault Tolerant Control ◽  
Redundant Actuation ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Actuation System ◽  
Civil Aircraft

In modern aircraft, the dissimilar redundant actuation system is used to resolve the actuator failure issues due to the common cause, thus increasing the system reliability. This paper proposes an adaptive integral sliding mode fault tolerant control strategy to deal with actuator fault/failure in the dissimilar redundant actuation system of civil aircraft. To cope with the unknown actuator faults, the adaptive integral sliding mode controller is designed where the modulation gain is made adaptive to the fault. To deal with the complete failure of certain actuator, the integral sliding mode control is integrated with control allocation scheme and distribute the control input signals to the redundant actuators. The performance of the proposed scheme is tested on the nonlinear model of dissimilar redundant actuation system, where the effect of external airload is accounted during simulations. The effectiveness of the proposed scheme is validated by comparing the simulations with the existing literature.

scholarly journals Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 227 ◽  
Author(s):  
Hao Lin ◽  
Jose I. Leon ◽  
Wensheng Luo ◽  
Abraham Marquez ◽  
Jianxing Liu ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Power Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Harmonic Distortion ◽  
Direct Power ◽  
Direct Power Control ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Mode Control

Three-level neutral-point-clamped (NPC) converter is widely used in energy conversion systems due to its good properties for high-power systems presenting output waveforms with reduced harmonic distortion. To obtain better system performance, an integral sliding-mode control (ISMC)-based direct power control (DPC) strategy is proposed for NPC converters. The controller achieves three objectives. First, an extended state observer (ESO)-based ISMC strategy, to enforce the active and reactive power to their reference values, is applied in the power tracking loop. ESO is used to reduce the influence of parameter uncertainties. Next, in the voltage regulation loop, a radial basis function neural network (RBFNN)-based adaptive ISMC strategy is applied to regulate the DC-link voltage. RBFNN is used to estimate the load variation, which is considered as a disturbance, to improve the system disturbance rejection ability. An adaptive law is used in the controller to reduce the chattering of reference active power which can reduce the current harmonic distortion. Finally, a proportional-integral (PI) control strategy is applied in the voltage balancing loop to achieve voltage balance between two DC-link capacitors. Experimental results show the effectiveness and superiority of the proposed control strategy for the NPC power converter compared with PI-based DPC strategy.

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