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The electrical power system loses its synchronization when it is subjected to a sudden event, such as high or low voltage and/or current levels due to disturbances, for instance, short circuits, lightning and the switching of the inductive loads. This paper presents the analysis of a coordination technique of resistive type superconducting fault current limiter (RSFCL) and shunt Static synchronous...
This paper presents a modified control strategy to improve the performance of a 3-phase induction motor drive system fed by a standalone PV power source. The main functions of the proposed control strategy are: 1) ensuring successful motor starting, 2) matching the on-site induction-motor pumping load with the available PV power, and 3) forcing the PV system to operate at the maximum power point....
The exponential growth of the Internet produces a huge amount of documents online. Finding the desired documents from amongst these huge resources is a difficult task. This problem is known as “Information Overloading”. Automatic Text Summarization techniques (ATS) try to solve this problem by extracting the essential sentences that cover most of the main issues in the document. So the user will spend...
This paper introduces a new proposed design and optimization simulation program for techno-economic sizing of stand-alone hybrid PV/wind/diesel/battery energy system. The main function of the new proposed simulation program (NPSP) is to determine the optimum size of each component of the hybrid energy system (HES) for lowest cost of kWh generated at highest reliability. An accurate methodology for...
This study presents a voltage generation behavioral analysis of the thermoelectric module (TEM) in a transient condition. Two configurations module is carried out to perform the observational analysis of the TEM; which is single TEM and multi stage TEM. For the multi stage TEM, another two arrangements is executed by cascading three and six TEM subsequently. In this real TEM application, both TEM's...
Propagation of uniform and profiled electromagnetic beams through apertures with binary amplitude transmission and random phase distributions at the far field (Fraunhofer limit) is investigated, and simulation results based on two approaches, (a) using the Fresnel-Kirchhoff diffraction integral directly, and (b) using a split step propagation concept whereby the aperture or phase screen is placed...
Medical equipment management life cycle considers various stages ranging from planning to disposal or replacement. Replacement decision is critical and essential stage of medical equipment. A variety of criteria contributes to make an intelligent replacement decision. We enhance the Fault Tree Analysis (FTA) model for replacement of medical equipment, considering a combination of technical, financial,...
This paper presents a modeling strategy for wind turbine generator power output using state duration sampling along with Markov chain approach. The proposed model is especially suitable for power production estimation and reliability analysis of a power system. The proposed strategy comprised of four steps: data clustering, state probability estimation, Monte Carlo estimation, and simulation of the...
In this research, an optimization of monthly tilt angle for solar panels for five main sites in Malaysia is conducted. The optimization method is based on the Liu and Jordan model for solar energy incident on a tilt surface. As a result, applying the monthly optimum tilt angle, increases the collected yields of the PV module/array in Kuala Lumpur, Johor Bharu, Ipoh, Kuching and Alor Setar by 5.03%,...
Application of the viable technologies in the new millennium has discovered successfulness in reducing undesirable problems related to power system operation. The advent of computational intelligence methods are mostly assisting to achieve high efficiency for controlling the changing of sophisticated process flow in industrials. Congestion problem in power system is a crucial issue as it leads to...
This paper presents a new energy management system (EMS) for small hybrid electric vehicle (HEV), which utilizes energy from the combination of battery, fuel cell (FC) and super capacitors (SC). These alternative energy sources are excellent potential solution to the ever-rising price of petrol. The major focus of this paper is the energy management system, which consists of a strategy to coordinate...
In this paper, some of the aspects related to the connectivity of DC microgrids to the main grid are investigated. A prototype system has been designed and implemented to address these aspects. The described system is dependent mainly on sustainable energy sources. Hence, a special care has been given to dealing with this kind of sources while designing different components of the system. Certain...
This paper is concerned with harmonic impact of different types of distributed generation (DG) units in low voltage distribution systems. This study considers the impact of three types of DG units connected to a power system, a mini hydro synchronous generator, photovoltaic system and double fed induction generator wind turbine. The DG units are modelled using the PSCAD/EMTDC program and simulations...
In this paper, some of the aspects related to the design and implementation of grid connected DC microgrids are investigated. A prototype system has been designed and implemented to address these aspects. The described system is dependent mainly on sustainable energy sources. Hence, a special care has been given to dealing with these kinds of sources while designing different components of the system...
We present the site-specific signal strength measurement results for path loss, shadowing, and fading in 2.4GHz band under typical harsh environment (high temperature 40-50 C and humidity 80-90%). We use spectrum analyzer Rohde & Schwarz FSH8 and InSSIDer (free software for WLANs). Measurements are taken in indoor and outdoor environments at various locations on different times of the day. An...
This article proposes a discrete particle swarm optimization (DPSO) for solution of the shortest path problem (SPP). The proposed DPSO adopts a new solution mapping which incorporates a graph decomposition and random selection of priority value. The purpose of this mapping is to reduce the searching space of the particles, leading to a better solution. Detailed descriptions of the new solution and...
Along the medical equipment life cycle, hospitals need to take decisions on medical equipment acquisition, maintenance, use and replacement on the basis of complete and reliable information. In this paper, the authors focus on the replacement criteria in developing countries where there is a lack of scientific, realistic and comprehensive assessment. In the proposed model, we use Fault Tree analysis...
In the modern industry, most of the equipment use semiconductor devices and microprocessors which are sensitive against power disturbances. Among all power disturbances, voltage sags are considered as the most frequent type of disturbances and their impact on sensitive loads is severe. To monitor these disturbances, voltage sag recorders (VSR) must be installed. However, installation of VSRs at all...
In this paper, the development of three-phase renewable energy inverter by using the dSPACE DS1104 digital signal processing controller board is presented. The board enables the MATLAB/Simulink model linking to the hardware. The standalone voltage source inverter's control system which is implemented in the DS1104 board utilizes a digital proportional integral controller to stabilize its 50Hz sinusoidal...
Capacity Benefit Margin (CBM) plays an important role in available transfer capability (ATC) computation. CBM is a transmission capability margin reserved by load serving entities to meet the generation reliability requirements. In recent years, there are several methods developed to compute the CBM. However, the methodologies do not consider the reliability of an interconnected system in the CBM...
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