scholarly journals Design and Implementation of High Order Sliding Mode Control for PEMFC Power System

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4317 ◽  
Author(s):  
Mohammed Yousri Silaa ◽  
Mohamed Derbeli ◽  
Oscar Barambones ◽  
Ali Cheknane
Keyword(s):  
Fuel Cells ◽  
Sliding Mode Control ◽  
High Efficiency ◽  
Sliding Mode ◽  
High Reliability ◽  
High Order ◽  
Proton Exchange ◽  
Lyapunov Theory ◽  
Variable Load ◽  
Mode Control

Fuel cells are considered as one of the most promising methods to produce electrical energy due to its high-efficiency level that reaches up to 50%, as well as high reliability with no polluting effects. However, scientists and researchers are interested more in proton exchange membrane fuel cells (PEMFCs). Thus, it has been considered as an ideal solution to many engineering applications. The main aim of this work is to keep the PEMFC operating at an adequate power point. To this end, conventional first-order sliding mode control (SMC) is used. However, the chattering phenomenon, which is caused by the SMC leads to a low control accuracy and heat loss in the energy circuits. In order to overcome these drawbacks, quasi-continuous high order sliding mode control (QC-HOSM) is proposed so as to improve the power quality and performance. The control stability is proven via the Lyapunov theory. The closed-loop system consists of a PEM fuel cell, a step-up converter, a DSPACE DS1104, SMC and QC-HOSM algorithms and a variable load resistance. In order to demonstrate the effectiveness of the proposed control scheme, experimental results are compared with the conventional SMC. The obtained results show that a chattering reduction of 84% could be achieved using the proposed method.

scholarly journals Nonlinear Disturbance Observer-Based Sliding Mode Control for the PMSM with Matched and Mismatched Disturbances

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yao Fang ◽  
Huifang Kong ◽  
Tiankuo Liu
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Observer ◽  
High Efficiency ◽  
Sliding Mode ◽  
Estimation Error ◽  
Permanent Magnet Synchronous Motor ◽  
Lyapunov Theory ◽  
Nonlinear Disturbance Observer ◽  
Mode Control ◽  
Nonlinear Disturbance

High-efficiency permanent-magnet synchronous motor (PMSM) is a key technology to improve the driving range of batteries in electric vehicles, while the mismatched disturbance that is caused by external disturbances and parameter perturbation may easily result in speed fluctuations and overshoot of the PMSM, which further deteriorate the performance and efficiency of batteries. To solve the problem, a novel nonlinear disturbance observer-based sliding mode control (NDO-SMC) is proposed. Compared with the traditional SMC method, the NDO-SMC scheme has better disturbance rejection ability in the presence of matched and mismatched uncertainties and disturbances by introducing the estimation value of the nonlinear disturbance observer in the sliding surface. Furthermore, owing to the compensation of the disturbance observer, the switching gain is only required to be greater than the bound of the disturbance estimation error rather than that of the disturbance; thus, the chattering problem is substantially alleviated. A rigorous stability proof of the whole closed-loop system is given in detail using Lyapunov theory by designing an appropriate Lyapunov function. The simulation results demonstrate the feasibility and superiority of the proposed NDO-SMC strategy.

scholarly journals High-Order Sliding Mode-Based Synchronous Control of a Novel Stair-Climbing Wheelchair Robot

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Juanxiu Liu ◽  
Yifei Wu ◽  
Jian Guo ◽  
Qingwei Chen
Keyword(s):  
Sliding Mode Control ◽  
Attitude Control ◽  
Control Method ◽  
Sliding Mode ◽  
External Disturbance ◽  
High Order ◽  
Lyapunov Theory ◽  
Stair Climbing ◽  
Synchronous Control ◽  
Mode Control

For the attitude control of a novel stair-climbing wheelchair with inertial uncertainties and external disturbance torques, a new synchronous control method is proposed via combing high-order sliding mode control techniques with cross-coupling techniques. For this purpose, a proper controller is designed, which can improve the performance of the system under conditions of uncertainties and torque perturbations and also can guarantee the synchronization of the system. Firstly, a robust high-order sliding mode control law is designed to track the desired position trajectories effectively. Secondly, considering the coordination of the multiple joints, a high-order sliding mode synchronization controller is designed to reduce the synchronization errors and tracking errors based on the controller designed previously. Stability of the closed-loop system is proved by Lyapunov theory. The simulation is performed by MATLAB to verify the effectiveness of the proposed controller. By comparing the simulation results of two controllers, it is obvious that the proposed scheme has better performance and stronger robustness.

scholarly journals Event-triggered Discrete-time Sliding Mode Control for High-order Systems via Reduced-order Model Approach

2020 ◽  
Vol 53 (2) ◽  
pp. 6207-6212
Author(s):  
Kiran Kumari ◽  
Bijnan Bandyopadhyay ◽  
Johann Reger ◽  
Abhisek K. Behera
Keyword(s):  
Sliding Mode Control ◽  
Discrete Time ◽  
Sliding Mode ◽  
High Order ◽  
Reduced Order Model ◽  
Order Model ◽  
Reduced Order ◽  
Mode Control ◽  
Event Triggered ◽  
Model Approach

scholarly journals Robust nonsingular sliding mode control of the maglev train system: case study

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Kammogne Soup Tewa Alain ◽  
Kenmogne Fabien ◽  
Siewe Siewe Martin ◽  
Fotsin Hilaire Bertrand
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Lyapunov Theory ◽  
Magnetic Suspension ◽  
Added Value ◽  
Vertical Position ◽  
Maglev Train ◽  
Maglev System ◽  
Mode Control ◽  
Train System

AbstractThis paper deals with a new approach to explore the precise dynamic response of the maglev system train and its control. Magnetic-suspension systems are characterized by high nonlinearity and open-loop instability which are the core components of maglev vehicles. Firstly, we use the electromagnetics and mechanics laws to derive the mathematical expressions of the proposed maglev system. Analytical investigation and theoretical calculation show that for the specific values of the control system parameters, the maglev system train can be significantly improved. It points out that the inherent nonlinearity, the inner coupling, misalignments between the sensors and actuators, and external disturbances are the main issues that should be considered for maglev engineering. Secondly, a control strategy based on the precise model of a nonsing ular robust sliding mode control is designed to reduce the upper bound of both the uncertainty and interference of the sliding mode controller. This approach presents an added value compared to the new sliding control methods in terms of overshoot and speed of convergence which is designed to control the vertical position of the proposed system. By using rigorous mathematical transformation associated with the adaptation laws in the frequency domain, a sufficient condition is drawn for the stability of the dynamical error based on the Lyapunov theory. This allows us a great possibility for interpreting the operation of the maglev train system. Numerical results are presented to show the effectiveness of our proposed control scheme.

scholarly journals High Order Sliding Mode Control for Suppression of Nonlinear Dynamics in Mechanical Systems with Friction

10.5772/15994 ◽  
2011 ◽  
Author(s):  
Rogelio Hernandez ◽  
America Morales ◽  
Norberto Flores ◽  
Eliseo Hernandez ◽  
Hector Puebl
Keyword(s):  
Nonlinear Dynamics ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
Mechanical Systems ◽  
High Order ◽  
Mode Control
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