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In this paper the reaching law approach to designing sliding mode controllers is used. In particular, the case of switching variable of relative degree r > 1 is considered. It is demonstrated, that the use of such a variable allows more freedom in designing the controller and can result in reducing the maximum absolute value of the control signal without compromising the robustness with respect...
In this paper, we present a robust pole placement control scheme that can be used to control a wide class of linear and time invariant systems with unknown parameters, including nonminimum phase systems, using only plant input and output signals. We assume that the unknown plant parameters has known bounds, i.e., the control scheme is designed for an interval plant whose coefficients are closed intervals...
Sliding mode control is a well-known regulation method that allows to obtain good robustness with respect to disturbances and model uncertainties. The use of a time-varying sliding hyperplane allows to select its starting position to cross the initial conditions of the system, and then move it toward the desired state. In this way, the sliding mode can be enforced for the whole control process. This...
In order to improve convergence rate while retaining smooth control action soft Variable Structure Control (VSC) can be considered. The classical formulation of soft VSC in continuous time domain assumes smooth switching among an infinite number of controllers. In now commonplace digital implementation changing the control structure is limited to sampling instances, leading to a quasi-soft control...
this paper presents an experimental implementation of the single phase power factor corrector PFC based on AC/DC converter with boost chopper. PI, Fuzzy logic and fuzzy adaptive PID controllers for the capacitor voltage are implemented to improve the performance of the boost converter. A self-tuning filter, used to extract the fundamental component from distorted voltage source, is applied to the...
This paper is concerned with a framework that combines sliding mode control and fuzzy logic systems. This controller is based on the variable structure system control theory and entails the advantages of sliding mode control and fuzzy logic control. The controlled system is a simulated two-links manipulator robot. It is found that the use of sliding mode controller gives good results yielding less...
The rotor speed estimation problem in electrical drives, based on shaft encoder measurements, has been dealt with by means of a digital approximate differentiator. The proposed differentiator is based on a digital VSC which is able to perform real 2-sliding modes, so that the observer discontinuous control is confined to the second total derivative of the available encoder signal estimate, and its...
In this paper the problem of effective current control in Switched Reluctance Machine (SRM) drives is addressed. A sliding mode pulse width modulator (SMPWM) is introduced to govern the inherently highly nonlinear system dynamics. The proposed SRM drive is analyzed theoretically and subsequently validated through simulation. Satisfactory dynamic performance and precise speed control with reduced torque...
A torque control method for Brushless Direct Current (BLDC) motor is introduced in this paper, which plays vital roles in In-wheel vehicle system. In-wheel motor can be used in electric cars with 4 wheels independent drive configuration. Within every wheel, there can be one “Direct-Drive In-wheel motor” to generate the necessary torque per wheel. In order to improve dynamic response characteristics...
A sliding mode variable structure controller for chaotic control in the permanent magnet synchronous motor (PMSM) is presented in this paper. The controller is deduced based on the Lyapunov function theory and the function switch control strategy. The angle speed of the PMSM can be flexibly adjusted according to the engineering requirement by the controller. The control method has powerful robust...
By introducing sliding mode predictive control (SMPC) techniques, a controller with passivity of a class of discrete-time uncertain singular systems is proposed in this paper. A new switching surface function is designed by taking the singular matrix into account, thus the resulting sliding mode dynamics is a full-order uncertain singular time-varying delay system. Due to feedback correction and receding...
This paper proposes a new approach for slow and matched disturbance suppression in digital sliding mode. The previous value of disturbance is extracted from switching function and used to make disturbance estimation, and later used in control to cancel disturbance effects. The control function is linear in state and in disturbance estimate. It may be considered chattering free since its value is zero...
A new gain-scheduling sliding mode controller for permanent magnet synchronous motor (PMSM) was designed to achieve position tracing control and robust control. The sliding mode position controller is designed to ensure the tracing and robust performance of the PMSM servo system firstly, and then the gain-scheduling based on fuzzy logic theory is adopted to reduce chattering of sliding mode controller...
Propose a rapid sliding mode synchronization method with non-singular terminal for unmatched uncertainties of chaos systems. Through the design of switching surface of sliding mode and corresponding nonsingular terminal sliding mode control strategy, making the two chaotic systems with unmatched uncertainties can be synchronized in finite time. Simulation results show that the proposed method reduce...
This paper proposes a particular method for position velocity loops to solve the velocity control problem associated with conventional sliding mode control of permanent magnet synchronous motor (PMSM) servo system. The merits of conventional sliding mode control approach and PID control technique were introduced to design this novel controller for the position and velocity loops. The sliding mode...
The single machine infinite bus system excitation control of power system is discussed in this paper. A nonlinear equivalent sliding mode controller and adaptive sliding mode controller are designed based on the theory of sliding mode variable structure control and stability analysis is included. The proposed design approach enables to compensate the inherent nonlinearities of the generator and to...
In this paper, based on the discrete sliding mode controlling theory, a steady active power regulator of a paralleled bi-generator system in watercraft power station is designed. And, a mechanic of the shift convergent rule is analyzed and relative algorithm is improved, which increases the convergent velocity by adopting an attenuation coefficient. With the limitary uncertain factors, the close-loop...
This paper establishes the mathematical model of the three degrees freedom hydraulic turntable system, and presents a new design method and procedures of the variable structure control(VSC) system, and a new control law based Lyapunov theory. In this paper, simulation experiments of three degree freedom electrical-hydraulic turntables are conducted, and researches the robustness characteristic of...
This paper considers the problem of the multi-target attitude tracking control for spacecraft formation flying. A robust multi-target attitude tracking control using adaptive sliding mode technique is developed, where the attitude of the leader spacecraft is represented by the Euler parameter to avoid the singular points. It is assumed that the parameters of the system and the disturbances from space...
Reformulated principle of fault estimation design for one class of first order continuous-time nonlinear system is treated in this paper, where a neural network is regarded as model-free fault approximator. The problem addressed is presented as approach based on sliding mode methodology with combination of radial basis function neural network to design robust nonlinear fault estimation. The method...
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