Extended State Observer Based Second Order Sliding Mode Control Strategy for DC-DC Buck Converters

Pneumatic artificial muscles (PAMs) are expected to play an important role in endowing the advanced robot with the compliant manipulation, which is very important for a robot to coexist and cooperate with humans. However, the strong nonlinear characteristics of PAMs hinder its wide application in robots, and therefore, advanced control algorithms are urgently needed for making the best use of the advantages and bypassing the disadvantages of PAMs. In this article, we propose a full-order sliding mode control extended state observer (fSMC-ESO) algorithm that combines the ESO and the fSMC for a robotic joint actuated by a pair of antagonistic PAMs. The fSMC is employed to eliminate the chattering and to guarantee the finite-time convergence, and the ESO is adopted to observe both the total disturbance and the states of the robot system, so that we can inhibit the disturbance and compensate the nonlinearity efficiently. Both simulations and physical experiments are conducted to validate the proposed method. We suggest that the proposed method can be applied to the robotic systems actuated by PAMs and remarkably improve the performance of the robot system.

Download Full-text

Extended state observer–based intelligent double integral sliding mode control of electronic throttle valve

Advances in Mechanical Engineering ◽

10.1177/1687814017737981 ◽

2017 ◽

Vol 9 (12) ◽

pp. 168781401773798 ◽

Cited By ~ 1

Author(s):

Yongfu Li ◽

Bin Yang ◽

Xuebo Zhang ◽

Qiuxuan Wu ◽

Taixiong Zheng

Keyword(s):

Sliding Mode Control ◽

Sliding Mode ◽

State Observer ◽

Extended State Observer ◽

Extended State ◽

Double Integral ◽

Electronic Throttle ◽

Integral Sliding Mode Control ◽

Integral Sliding Mode ◽

Mode Control

Download Full-text

Super-Twisting Second-Order Sliding Mode Control of a Wind Turbine Coupled to a Permanent Magnet Synchronous Generator

International Journal of Intelligent Engineering and Systems ◽

10.22266/ijies2021.0228.45 ◽

2021 ◽

Vol 14 (1) ◽

pp. 484-495

Author(s):

Rania Moutchou ◽

◽

Ahmed Abbou ◽

Salah Rhaili ◽

◽

...

Keyword(s):

Sliding Mode Control ◽

Wind Turbine ◽

Permanent Magnet ◽

Control Strategy ◽

Sliding Mode ◽

Synchronous Generator ◽

Second Order ◽

Permanent Magnet Synchronous Generator ◽

Mode Control ◽

Second Order Sliding Mode

This paper presents a modelling study and focuses on an advanced higher order slip mode control strategy (Super Twisting Algorithm) for a variable speed wind turbine based on a permanent magnet synchronous generator to capture the maximum possible wind power from the turbine while simultaneously reducing the effect of mechanical stress, powered by a voltage inverter and controlled by vector PWM technique. This paper presents first and second order sliding mode control schemes. On the other hand, a challenging matter of pure SMC of order one can be summed up in the produced chattering phenomenon. In this work, this issue has been mitigated by implementing a new control. The proposed control, characterized by a precision in the case of a continuation of a significant reduction of the interference phenomenon, successfully addresses the problems of essential non-linearity of wind turbine systems. This type of control strategy presents more advanced performances such as behaviour without chattering (no additional mechanical stress), excellent convergence time, robustness in relation to external disturbances (faults in the network) and to non-modelled dynamics (generator and turbine) which have been widely used in power system applications by first order sliding mode control. In particular, second-order sliding regime control algorithms will be applied to the PMSG to ensure excellent dynamic performance. The suggested control is compared to the proportional-integral controller and sliding mode control of order one. The results of simulations under turbulent wind speed and parameter variations show the efficiency, robustness and significantly improved performance of the proposed control approach to distinguish and track quickly (about 10ms depending on the shading pattern) and at the same time saving the main priorities of the sliding mode of order one by reducing the existing chatter. The systems performances were tested and compared using Matlab/Simulink Software.

Download Full-text