Theses & Dissertations

Permanent URI for this collection

https://hdl.handle.net/20.500.14170/206

Browse

Recent Submissions

Now showing 1 - 5 of 244
  • Publication
    The guidelines of parameters in the implementation of local monocular vision system for robot soccer using the mirosot platform
    (Universiti Malaysia Perlis (UniMAP), 2016)
    Sivadev S. Nadarajah
    The conception of robot that plays soccer was a major step in autonomous multi agent system, many agents that work together to achieve a common goal. This research field was promoted with the introduction of two international events, the Federal International Robot Soccer Association (FIRA) and Robot Soccer Cup (RoboCup). Similar to the real human game of soccer, the player rely the most on his vision as the source of information about his environment and this duplicated into robot soccer, which allows for the use of cameras as the single sensor. This research will experiment five concepts to determine the guidelines needed in the implementation of local monocular vision system. The experiment are (a) the minimum frame rate for the establishment real-time vision, (b) various color model and segmentation techniques and its efficiency in terms of frame rate, (c) the type of object detected (d) The processing of the video as a complete video frame- full video, separated video for each camera- split video and (e) The influence of displaying the video or not displaying the video, during gameplay, on the frame rate. Based on the findings, the guideline of parameter was established are the minimum frame rate of 16 frames per second (fps). The experimented color models were RGB, HSV and YUV in which RGB showed a mean value of 21.38fps, HSV with a mean value of 16.00fps and YUV with a mean value of 15.60fps. RGB will be the color model of choice as it achieves the concept of real-time video.The objects to be detected are of basic geometry shapes, namely circle, small rectangle and large rectangle, which are currently employed in other robot soccer leagues. In terms of distance estimation, the calibration method proves worthwhile even though it give erroneous result when the object being detect is close range or long range. The way to solve this situation is to use these ranges by creating certain strategies such as near range for defense or kicking. Another issue tackled effects to display the real-time video or hiding (not displaying) the video. The result showed that by not displaying the video the frame rate increases by as much as 3% or an increase of about 0.8fps in average. Being the only sensor applied, the video processing that is required has to have a minimal impact in terms of processing time, which will result in the increase in frame rate. Based on the fmdings of these experiments, a guideline of parameters can be established in the implementation of local monocular vision system, which consist of multiple wireless camera system, processing the ROB or the raw video format coming from the camera, using the full video mode when displaying an processing, lastly to provide an option the display or not display the video hence increasing the frame rate when not needed to debug. Calibration method distance estimation can be utilized but four ranges should be define and strategies set for these ranges.
  • Publication
    Design of indirect AC-AC converter based on linear controller for power systems
    (Universiti Malaysia Perlis (UniMAP), 2016)
    Hassan Taher A. Naser
    Many studies emphasized on the needs to provide a sufficient converter to achieve efficient performance with different levels of the load demand and input voltage. The current issues associated with the changes in input and output performance of a specific power electronic converter could lead to a sudden failure of other subsystems. Hence, it's more difficult to look for the inability standards of a portion or even method within power systems as compared to other domains. To take this problem, the design of indirect AC-AC converter in order to provide desired AC power to a load. The proposed work considered the utilization of three-phase rectifier because it does not require specific control. In addition, the controlled DC to AC was assumed in this study to promote the performance of the overall systems. The method was mainly formed to analyze the effect of variations in input voltage and also load demand along with the performance. A three-phase rectifier was performed using MATLAB software packages. To investigate the effect of variations and load variations in input voltage of the converter, the performance in 400, 500, and 600 volts input is compared and analyzed. The simulation result also show that the indirect AC-AC converter is able to regulate the output voltage during balanced load conditions and during the presence of linear load. Finally, the obtained waveforms consists of similar phase angles which suggest that the proposed indirect AC-AC converter provides uniform phase performance with different amplitudes of the input AC signal.
  • Publication
    Simulation of three phase induction motor on stationary reference frame
    (Universiti Malaysia Perlis (UniMAP), 2016)
    Mohd Wafiuddin Yahya
    This thesis presents the qdO axis based modeling is proposed to analyze the transient performance of three phase induction motor with the specifications as 0.5Hp, 420V, 50Hz and 4 poles using stationary reference frame. In electrical engineering field, this qdO transformation is used to simplify the analysis of three phase circuit and its application is to reduce the three AC quantities to two DC quantities. This research started with the findings of the parameters of the machines used. There are three main methods are used which are stator DC measurement test to find the value of stator resistance, r1, no-load test to find the value of the magnetizing reactance, Xm and blocked rotor test for the values of rotor resistance, r2, stator and rotor leakage reactance, X 1 and X 2. All data collected and recorded in a table. These methods have been done in the laboratory room. Matlab Simulink package is used to analysis the transient behavior of the three phase induction motor and the sufficient time span is included to study the complete motor's characteristics. The analysis results show the magnitude of phase voltage (V11h) to neutral, phase currents of stator, speed and torque of the machine. The magnitude of v,,. to neutral point of the three phase induction motor is 342.9V. The analysis of the phase voltage also show that phase-b voltage to neutral is lagging phase-a voltage to neutral and the phase-c voltage to neutral is leading the phase-c voltage to neutral. Each lagging and leading is ~n or 120°. For phase stator currents are discussed about the phase-a, phase-b and phase-c in terms of the magnitudes reduce from the high inrush current during the starting up motor until reaching the steady state condition. The magnitude values of the phases current are 1.89A and the time taken is 0.8 seconds when reached the steady state condition. As for the speed of the rotor, it is starting from Opu and time also 0 and increase linearly to the time until reach the steady state value. The speed reach the steady state value at 1.16 pu and the time is 0.8956 seconds. The highest magnitude recorded for the starting torque is 22.92Nm and this value keeps changing until it reaches the steady state value. The steady state value for this torque is 2.37Nm and the time is 0.9653 seconds.
  • Publication
    Investigate on the effect of embedded generation to power system voltage stability using MATLAB
    (Universiti Malaysia Perlis (UniMAP), 2015)
    Ahmed Ali Dangour Attaher
    The current practices associated with voltage stability in most power systems consists of the ability to store each and every sequence for the converter to have the necessary voltage balance associated with the total developed and taken power. The main problem here is that the power system may face instability in voltage distribution during progressive or uncontrollable drop in voltage magnitude after a disturbance which may occm due to unexpected increase in power load or change in operating condition. This thesis has investigated the effect of the embedded generation on the stability of the voltage in a power system. For the purpose of this research power system with 14 buses and Font somces has been modeled by using MA TLAB Simulink software. Voltage sensitivity analysis method was used in this study with regard to detecting voltage collapse vulnerability of buses. The result of P-Q regions for PV buses and PQ buses were compared based on the loading margins of the bus voltage within P-Q regions. To compare the voltage stability in the system, the simulation has been carried out with embedded generation and without embedded generation. Moreover, in this simulation EG has been placed in a different bus for each time a simulation is run. Results have shown that the active power and reactive power IEEE 14 bus circuit model generates streams of different load when embedded generation is injected into a different bus. The voltage on each bus from the results has been analyzed as well. This study found that maintaining a gradual state voltage can allow a range of continuously constraints along with minimizing vitality losses within a considerably long period as a result. The voltage along with reactive power control equipment can be operated locally dependent on pre-determined local points.
      4  1
  • Publication
    The effectiveness of voltage SAG mitigation on chiller utilities equipment to comply SEMI-F47
    (Universiti Malaysia Perlis (UniMAP), 2015)
    Arivindha Rao Appana
    The purpose of this thesis is to study the effectiveness of voltage sag mitigation on chiller controller equipment to comply SEMI F47 standards. The thesis adopts a comprehensive data measurement and analysis on voltage trend on selected dmation on chiller control circuit. SEMI F47 standards specification allow the voltage sag 50% within 0.3sec from the nominal voltage are acceptable range. All related data measurement were taken at a semiconductor company in Bayan Lepas Industrial Park, Penang. To achieve this, it is essential to properly select voltage sag device depending on working environment and physical equipment. Allen Bradly Bulletin l608P ProDySC25 is capable for voltage sag mitigation, which contributes towards improvements on voltage stability if subjected to voltage sags. There are limitations ofthe voltage and current ranges given the restricted choice of equipment selection. This study provides in-depth knowledge on the importance and benefits of voltage sag mitigation, in its contribution to significant voltage quality with increasing total equipment efficiency to meet SEMI-F47 in business operations. This thesis is very original as on highly accurate voltage and duration trends measured on actual performance of voltage sag device hooked-up on chiller controller equipment as real-time.