Sahazati Rozali

Simulink implementation of digital cascade control DC motor model - a didactic approach

This paper depicts the interactive and easiest method of developing a digital cascade control model for direct current (DC) motor in SIMULINK environment. The development method is described step-by-step to give better understanding to electrical engineering students. The development phase focuses on the dasiahands onpsila approach so that students and engineers able to follow the steps. SIMULINK/MATLABcopy is used based on its reputation as a powerful tool for engineers and scientists when developing and modeling systems. Modeling phase begin with the model of a simple DC motor, a DC/DC H-bridge converter and controller design. Various control method shown in this paper provides interactive learning on how to perform conventional proportional - integral (PI) controller and intelligent self tuning PI controller using fuzzy algorithm. In the DC/DC H-bridge converter design, the significant used of a particular power electronic devices is thoroughly elaborated.

Performance Comparison of Particle Swarm Optimization and Gravitational Search Algorithm to the Designed of Controller for Nonlinear System

This paper presents backstepping controller design for tracking purpose of nonlinear system. Since the performance of the designed controller depends on the value of control parameters, gravitational search algorithm (GSA) and particle swarm optimization (PSO) techniques are used to optimise these parameters in order to achieve a predefined system performance. The performance is evaluated based on the tracking error between reference input given to the system and the system output. Then, the efficacy of the backstepping controller is verified in simulation environment under various system setup including both the system subjected to external disturbance and without disturbance. The simulation results show that backstepping with particle swarm optimization technique performs better than the similar controller with gravitational search algorithm technique in terms of output response and tracking error.

Robust Control Design of Nonlinear System via Backstepping-PSO with Sliding Mode Techniques

This research focus on designing controller for nonlinear system by integration of two robust controllers, back-stepping and sliding mode controller. The dynamics of the system is developed by consider its nonlinearities incorporating external disturbance injected to the system’s actuator. The value of control and reaching law parameters are determined by using particle swarm optimization method such that these parameters are varying automatically according to the changes of the dynamics of the system. The tracking performance of the system yielded by integration of back-stepping and sliding mode controller is compared with its output performance produced by classical sliding mode controller. The results show that assimilation of back-stepping and sliding mode controller for the chosen system generates better performance than sliding mode controller itself which is evaluated in terms of tracking output and tracking error.

The effects of pressure variation in sliding mode controller with optimized PID sliding surface

The high demands in the control of force and position implemented in diverse applications have led to the increasing usage of Electro-Hydraulic Actuator (EHA) system. However, the EHA system is commonly exposed to the parameter variations, disturbances, and uncertainties, which are caused by the changes in the operating conditions. Hence, this paper attempts to analyses the impact of changes during the operating condition and a robust control strategy is then formulated based on the control law of the Sliding Mode Control (SMC), where the design of the sliding surface is integrated with the Proportional-Integral-Derivative (PID) controller. Then, the Particle Swarm Optimization (PSO) technique has been utilized to seek for the optimum PID sliding surface parameters. The findings indicate that the proposed robust SMC with PSO-PID sliding surface is preserved to ensure the actuator robust and stable under the variation of the system operating condition, which produce 26% improvement in terms of its robustness characteristic.

Achieving Thermal Power System Stability Using Load Frequency Controller

This paper focuses on load frequency control (LFC) of a single area thermal power system. The purpose of LFC is to minimize the transient varieties due to frequency deviation by ensuring zero steady state error. The frequency deviation normally caused by load perturbation. Hence, the primary goal of this paper is to design LFC for power system stability. Single area thermal power system comprises of governor framework, non-reheat turbine model and generator with load. The closed loop system performances in term of transient and steady state are observed and analyzed by injecting multifarious load perturbation. The simulation results are obtained via simulation works using MATLAB with SIMULINK toolbox.

Achieving optimum tip-speed-ratio of a two-mass wind turbine system

This paper proposes a three term PID controller to achieve optimum tip-speed ratio of a variable speed fixed pitch two-mass wind turbine system. The main advantage of the method is the functional simplicity and the robust performance in a wide range of operating condition. The objective is achieved by maintaining optimum speed of the rotor via adjusting the restoring generator torque. Hence, PID controller is formulated and employed into the generator side of wind turbine system to achieve the asymptotic tracking of the rotor speed. To validate the effectiveness of the proposed method, a simulation in MATLAB/SIMULINK® is carried out. The result shows that the speed tracking can be achieved by using PID. However, the speed response shows inadequate control performance with less efficacy as the closed-loop system incur large initial speed overshoot. This phenomena shows the shortcomings of conventional PID and hence, open up new research awareness on solving this problem.

Designing learning material for engineering course using practice and application oriented approach

This paper discussed on the design of learning material for engineering course based-on practice and application oriented. The approach requires students to experience the professional practice of their specialization and then apply their knowledge to solve industrial related problems. The concept is well established abroad in Germanys universities and other universities in Europe and Australia. UTeM is committed towards producing graduates who have scientific and professional strength in the field of expertise, strength in applying and practicing the knowledge that they have learned and personal competencies in lifelong learning. The program structure, the curriculum and the syllabus need to be revised from time to time in order to meet the objectives. The paper focused on designing a lab material for subject control systems engineering. The practice based-learning material is illustrated and discussed on topics of modeling DC motor and designing PI, PD and PID controller. The paper also explained the typical conventional method and the proposed practice based-learning approach that have been introduced to undergraduate engineering students. A significant advantage of this method is that it offers a deeper understanding and skill for students to integrate between theory and practice.