Pittaya Pannil

Discrete time robust integral servo with PID × (n-2)/2 Stage PDA Controllers for unstable systems

This paper presents a design method for robustness stability results of unstable systems using forward controller employed to PID × (n-2)/2 Stages PDA Controllers which applied to integral servo problem, both continuous and discrete-time control systems, the root loci of this design method are shown the robustness results with the excellence transient response of this closed loop systems, moreover, in case of increasing controller loop gain, the system is still robustly stabilizable with better performance.

Discrete PID ×(n−2) stage PD cascade controller for SISO systems

This paper presents a design method for discrete-time parallel with continuous-time design for the nth order plant employing PID (Proportional-Integral-derivative) times(n-2) stage PD as a cascade controller. The controller is designed to meet the transient and steady state response specifications via the root locus approach. The results revealed that, if the sufficient sampling time for discrete-time system is available, all desired specifications are easily obtained.

Closed-form formulas for continuous/discrete-time PIDA controllers' parameters

This paper proposes the formulas for finding the Proportional gain, Integral gain and Derivative gain simultaneously of the PID controllers in both continuous-time and discrete-time systems. Once, the satisfied PID controller in continuous-time system is obtained. Then, just discretises it by using trapezoidal approximation or bilinear transformation, the discrete-time PID controller is easily achieved as well. The results from simulations revealed that this discrete-time controller provides a faster response than the continuous-time case.

Load swing control of an overhead crane

This paper proposed a controllers design method for controlling the load swing of an overhead crane. By addition of the quadratic derivative of state variables term in the usual standard performance index for Linear Quadratic Gaussian (LQG) optimal control as an extra weighting function to play the role in this task. The results revealed that the swing of the load can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested.

Development of Inverted Pendulum System at KMITL

This paper presents the development of Inverted Pendulum System at King Mongkuts Institute of Technology Ladkrabang (KMITL), including the designing, construction and control system design. The stabilizing of an unstable system in optimal control scheme via state-space approach is applied. The LQG controller design examples including the addition of the quadratic derivatives of state variables term in the usual standard performance index for linear quadratic Gaussian optimal control as an extra weighting function to play the role in swing suppressor is presented. Finally, a new inverted pendulum system nearly SEGWAY function is shown in this paper.

Discrete-time PIDA controller designed by Kitti's method; a third generation

This paper proposes the design of Discrete-Time PIDA (Proportional-Integral-Derivative-Acceleration) controller. Once, the satisfied PIDA controller in Continuous-Time system is obtained. Then, just discretises it by using trapezoidal approximation or bilinear transformation, the Discrete-Time PIDA controller is easily achieved as well. The root loci of the closed-loop systems are circular shapes in both s-Plane and z-Plane implied that increasing of the open loop gains, the faster and smaller in percent overshoot can be obtained. Comparing among three generations are shown that the third generation of Discrete-Time PIDA controller is the simplest way in design without the difficulty to place the zeros of the controller in z-Plane as in the second generation when the sampling time is too small.

Discrete robust PID×(n-2) stage PD cascade controller

This paper presents a design method for discrete-time parallel with continuous-time design for the two degree of freedom (2DOF) control system using PID (Proportional-Integral-Derivative)×(n-2) stage PD as a cascade controller for a class of nth order plant. Both, transient and steady state response specifications are suddenly met when the forward controller is employed. The root loci of this method are shown that the closed loop system is robustly stable with excellence.

Discrete optimal H 2 controller for Inverted Pendulum System

This paper presents the designing of the digital controller compare with analog controller for inverted pendulum system. The digital controller that presented is discrete optimal H2 controller by discretizing plant then applied it with digital controller design technique, as DLQR, DLQE and DLQG follow state-space approach including addition of the quadratic derivatives of state variables term in the usual standard performance index for linear quadratic Gaussian optimal control as an extra weighting function to play the role in swing suppressor. The results revealed that the swing of the Pendulumpsilas angle can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested.