EECon - 2015
Permanent URI for this collectionhttp://192.248.9.226/handle/123/20344
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- item: Conference-Full-textProceedings of the Electrical Engineering Conference 2015 (Pre Text)(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Jayasekara, AGBP
- item: Conference-Full-textDesign and simulation of a human-like robot neck mechanism(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Edirisinghe, EANS; Lakmal, RAP; Lakshitha, TGG; Sirimanna, SWDTS; Jayasekara, AGBP; Jayasekara, AGBPA vast range of human-friendly interactive robotic heads is being developed by researchers. However these robot heads require improvements in construction and behavior to achieve more human-like performance. Therefore this paper proposes a design of a robotic head with human-like movements. The details of the kinematic analysis, particulars on mechanical design of the neck, the electrical and control system of the robotic neck are discussed. The design parameters have been identified by analyzing the bio-mechanical information related to basic head movements of the humans. This paper includes a way to imitate human neck movements of flexion and lateral flexion. Design of this robotic neck platform is done in such a way that it can be used as a platform for facilitating further developments in integrating more additive features to a robotic neck, which are to be incorporated as per needed by any developer.
- item: Conference-Full-textWind resource assesment and turbine selection: case study for Mannar, Sri Lanka(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015) Kalpage, KMT; Peiris, KRD; Perera, KAIRP; Siriwardana, MGCI; Lidula, NWA; Wickramarathna, MTAP; Jayasekara, AGBPIn deploying a large scale wind power plant, there are several aspects that have to be assessed. Among them the initial site screening for wind power plants, wind data assessment and proper selection of wind turbines are vital for the success of the project. This paper presents a step by step analysis in selecting a wind turbine, as a case study for Sri Lanka, where it has a substantial amount of wind energy that can be harnessed for power generation. Mannar area is identified as the candidate site with the high wind potential it exhibits throughout the year. After a detailed analysis of the wind resource in Mannar area, Gamesa-114 2 MW wind turbine is selected as the most suitable wind turbine for this particular area of Sri Lanka.
- item: Conference-Full-textDesign and simulation of a robotic arm for a service robot(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Pathirana, MGK; Perera, KTK; Sirithunge, HPC; Srimal, PHDAS; Jayasekara, AGBP; Jayasekara, AGBPThis paper focuses on designing and simulation of an interactive robotic arm for pick and place and service applications. The robot is expected to have image processing and voice recognition capability. The mechanical structure is simulated using forward kinematics and for this, Denavit-Hartenberg parameter method is used for the proposed design and hence the mechanical structure is simulated in MATLAB and SolidWorks. SolidWorks structure comprises the proposed link lengths and joints which were used for forward kinematics calculations and workspace simulations. Static and dynamic torques are taken into consideration to determine the torques of joint motors. It is expected to find the design requirements and assess the scope of the robot arm before its manipulation.
- item: Conference-Full-textA dc link for the power system simulator(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Abeyrathne, PM; Abeysinghe, AMGT; Karunanayake, IM; Ranasinghe, PMH; Dias, MP; Lucas, JR; Jayasekara, AGBPHigh Voltage Direct Current (HVDC) links are used for bulk power transmission due to its advantages over the alternating current (ac) transmission. A HVDC link between India and Sri Lanka has also being proposed. Hence it is a timely needfor the students in local universitiesto be able to study the behaviour of HVDC transmission. This paper presents the design of a DC link for a locally assembled Power System Simulator as a teaching tool.The objective is to use this design as a learning tool to study the behaviour of HVDC transmission under normal and abnormal operation. It is expected to be used for laboratory experiments related to HVDC transmission and Power Electronics, hence providing the opportunity for visualization of the behaviour of performance parameters at the significant points of the model.
- item: Conference-Full-textAnalysis of induction motor performance under unbalanced supply voltage conditions and its impact on the network voltage unbalance propagation(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Kattriarachchi, KG; Arachchige, VO; Kanchana, LG; Gunaratna, RDDCY; Jayasekara, AGBPVoltage unbalance (VU) is regarded as a power quality problem of significant concern at the electricity distribution level. Influence of unbalanced supply voltages on the adverse performance of power system and its equipment is intensified by the fact that a small unbalance in the phase voltages can cause a disproportionately larger unbalance in phase currents. Naturally, three phase Induction Motor (IM) loads which are considered to be the main work horses of many industrial environments, are symmetrical devices and do not possess any inherent unbalance. However, the operation of three-phase induction motor is adversely affected by the supply source unbalance. Voltage unbalance causes a lot of adverse effects on induction motor such as Overheating, line-current unbalance, derating, torque pulsation, and inefficiency. The overheating leads to winding insulation degradation. Despite the degrading of motor performance, it has been found that the existing level of the voltage unbalance (VU) at the point of common coupling (PCC) is attenuated due to the presence of induction motor load. The following analysis shows how VU is attenuated by three phase induction motors at the point of evaluation (POE). Finally this paper presents a practical approach to evaluate VU propagation at different points of the network in terms of the Voltage Unbalance Factor (VUF) and hence the level of attenuation made by induction motor loads.
- item: Conference-Full-textA matlab simulink model for a partial discharge measuring system(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Gunawardana, SDMS; Kanchana, AAT; Wijesingha, PM; Perera, HAPB; Samarasinghe, R; Lucas, JR; Jayasekara, AGBPFailures in high voltage equipment are often caused due to internal faults which cause a local electrical stress concentration in the insulation; called as partial discharge. Therefore partial discharge detection is highly important for an early detection of insulation failure. Here in this study the simulation of partial discharge has been carried out with a void inside an insulation medium. This paper gives a detailed description about a simulation done with MATLAB SIMULINK package, of the measurement of partial discharges. Further a calibrator for the measuring equipment has been designed and integrated into the circuit. The linearity of the measuring system has also been confirmed using the calibrator. The model developed has been validated using a cylindrical void inside an epoxy resin insulator. Results obtained show a close similarity with results obtained by other researchers.
- item: Conference-Full-textWireless power transmission for multiple devices(Electrical Engineering Society (EESoc) of Department of Electrical Engineering, University of Moratuwa, 2015-12) Chanaka, AKK; Jayawardhana, GC; Lionel, LHTD; Bolonne, SRA; Jayasekara, AGBPWireless power transfer can make an extraordinary change in the field of the electrical engineering which eliminates the use of conventional copper cables and current carrying wires. In this paper, we present the concept of wireless power transmission for multiple devices. The concept is based on resonant inductive coupling wireless power transmission technology. The design contains a multiple-receiver wireless power transmission system by using only one transmitter.