Aziah Khamis

Study of renewable energy potential in Malaysia

Malaysia has many renewable energy sources that can be developed such as solar, wind, biomass, hydro, geothermal and tidal wave. However, it is not yet widely developed. Since, energy is important, a national center for renewable energy resources database should be setup to bring together designers, engineers, architects and policy makers to use the actual data for implementing renewable energy projects. The objective of this study is to determine the most suitable renewable energy generation to be implemented in Malaysia from four obvious options available which are solar, wind, biomass and tidal wave. A study has been conducted in several contributing factors namely geographical distribution, technology involved and economic analysis. The analysis has been done by gathering the related information and data from previous studies as well as and visits to sites and related authorities. The result of these analysis shows that biomass energy generation has the most encouraging potential to be developed in Malaysia as shown by evidences from the comparative study being made in this paper.

Simulation single phase shunt active filter based on p-q technique using MATLAB/Simulink development tools environment

This paper presents a single phase shunt active power filter based on instantaneous power theory. The active filter will be connected directly to utility in order to reduce THD of load current, in this case the utility is TNB. The instantaneous power theory also known as p-q theory is used for three phase active filter and this paper proves that the p-q theory can also be implemented for single phase active filter. Since the system has only single phase signal for both voltage and current, thus the dummy signal with 120 º different angels must be generated for input of the p-q theory. The p-q technique will generate six signals PWM for switching IGBT, but only two of the signals will be used to control the switching IGBT. The simulation results are on MATLAB/Simulink environment tools presented in order to demonstrate the performance of the current load on single phase shunt active power filter.

Performance comparison of bidirectional converter designs for renewable power generation

This paper aimed at comparing the performance of bidirectional converter designs for renewable source power generation such as wind. The bidirectional converter is supposed to allow a bidirectional power flow between power line and a battery system. In order to determine the most applicable bidirectional converter circuit which meets a set of requirements, four types of designs which were based on previous work of others were simulated with PSCAD software. The ability of each design to maintain a set voltage at the power line and also the direction of current flows at the battery as well as at the output of the converter are investigated.

Faster Detection of Microgrid Islanding Events Using an Adaptive Ensemble Classifier

A novel scheme for fast detection of islanding events in a microgrid is proposed in this paper. The scheme consists of a passive islanding detection process using an adaptive ensemble classifier and measurements of three-phase voltage at the distributed generation (DG) terminals. Initial features inputs to the classifier are obtained using the phase-space method. They are then used to train an ensemble classifier which comprises a set of randomized neural networks called extreme learning machine (ELM). The optimal parameter settings for each ELM are identified through evolutionary computation. An adaptive decision mechanism is designed to progressively adjust the decision time of the events classification, where its decision speed can be significantly improved over existing methods. Extensive tests are conducted on a radial distribution system with two identical DG units and the IEEE 33-bus with four DG units, considering various scenarios of islanding and non-islanding conditions, as well as the different types of DG. The simulation results show that the proposed scheme can make accurate decisions at appropriately earlier times, which achieves a good balance between efficiency and accuracy in detecting the islanding events.

The Impact of Embedded Generation Due to Harmonic Performance

The paper investigates the most suitable location of inverter connection installed into the distribution line feeder. Thus, it can reduce losses, control voltages as well as the protection system. Besides, it is more focused on mitigated a whack-a-mole phenomenon due to its fifth and seventh harmonics. Whack-a-mole phenomenon occurs as an active filter or passive filter installed on the long feeder line. It effect harmonic voltage where increase on some busses and decrease on other busses, especially at point of installation. In this paper, the inverter replaced by directly connected with the current source. Thus, parallels current source with combination of fundamental, third, fifth and seventh harmonic frequencies were tested. From the analysis, the best location of inverter current source should be at least λ/4 from end bus. Thus, it proves by looking into its harmonic voltage, harmonic current and total harmonics distortion (THD) performance.

Investigation on the performance of pico-hydro generation system using consuming water distributed to houses

This paper describes the testing conducted that necessary to investigate the performance of pico-hydro generation system using consuming water distributed to houses. Water flow in the domestic pipes has kinetic energy that potential to generate electricity for energy storage purposes in addition to the routine activities such as laundry, cook and bathe. The inherent water pressure and water flow inside the pipe from utilitys main tank that used for those usual activities are used to rotate small scale hydro turbine to drive a generator for electrical power generation. Results from the test significantly show the proposed system is feasible for electrification for energy storage purpose and indicate the prospect of further improvement and future research.

Effect of slot-width in slot-type linear motor

This paper discuss about the effect of slot-width in slot-type linear motor. Linear motor is a device that produces linear motion without using any mechanical transmission to convert from rotary motion to linear motion. The main objective of this paper is to investigate the effect of slot-width in slot-type linear motor. The force needs to be maintained for used in food processing application. Besides that, the slot-width is adjusted to obtain long displacement for the mover to move. Ansys Maxwell software is used to simulate the performance for this innovation. The variable parameters are the height of slot pole shoe, gap between coils, number of turns and height of coil. This investigation can give an idea to design the new device that requires compression method. The new device will help to overcome and solve the weakness of the conventional compression method. In conclusion, this research provides overview and guidelines of slot-type linear motor for food processing application.

Lightning flashover test on pipeline: Effect to conducting material

It is generally known that power system outages caused by lightning flashover present a serious engineering problem. Most of the industrial company take serious action in order to protect their equipment from damage by natural causes such as lightning. It will be the necessary precautions to keep the lightning channel far away from the immediate neighbourhood of flammable and explosive materials. Protection of electric equipment against this power of nature is one objective of high voltage engineering and testing. The aim of this study is to investigate flashover in gap between industrial pipeline and any conducting material around the pipe. Impulse voltage test are used to simulate the lightning and tested on prototype of pipeline. The influence of the spark gap discharge on the statistics of the air breakdown processes has been investigated in a wide range of gap lengths from 1.0cm to 3.0cm under impulse conditions. The results were discussed base on its breakdown voltage affected by the length of the gap.