Browsing by Author "Ekanayake, J"

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    Ac-dc multi-port domestic distribution interface
    (IEEE, 2018-05) Gunaratne, T; Wijesinghe, D; Wijerathne, K; Binduhewa, PJ; Ekanayake, J; Chathuranga, D
    The rapid development of PV systems and energy storage techniques have created opportunities for further evolvements on the utility side. On the other hand, the number of conversion stages required to feed inherent and converter controlled dc loads from the ac grid have compromised the efficient operation of the power grid. The proposed multi-port distribution interface combines dc and ac power resources and dc and ac loads with minimum number of power electronic conversion stages thus increases the energy efficiency. This paper presents the development of the converters and the controller functions of the proposed interface which is to be implemented in a domestic scale. Along with the individual simulations the paper includes several case studies where different behaviors of the overall system are discussed.
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    DC microgrid as a solution for utilisation of solar photovoltaic sources
    (Institute of Electrical and Electronics Engineers, Inc., 2016-12) Bandara, AIMH; Binduhewa, P; Ekanayake, J; Rajapakse, A; Prasad, WD
    MicroGrid (MG) is a convenient solution to integrate renewable energy sources to the existing power network. Though ac MicroGrids are widely studied, researches are focused towards the implementation of dc MicroGrids in order to improve the utilization of renewable sources with dc power output. In this study a MicroGrid architecture for commercial buildings and domestic houses with solar photovoltaic (PV) as the renewable energy source is proposed. The dc MicroGrid was implemented in PSCAD/EMTDC software package and simulations studies were conducted to validate the operation.
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    Issues with supply chain management documents that contribute to project delays
    (Department of Building Economics, 2024) Ekanayake, J; Allis, C; Jayasinghe, S; Lokuge, A; Sandanayake, YG; Waidyasekara, KGAS; Ranadewa, KATO; Chandanie, H
    Supply chain management is the process of obtaining the raw materials or components needed to create a product or service for an enterprise and deliver that product or service to customers. In construction, it is vital due to the involvement of a large number of resources and stakeholders. Hence, documentation plays a very important role in such a process. Yet, there are certain issues with supply chain management documents that contribute to the various issues of construction projects, including project delays. Hence, this research aimed to identify the potential factors affecting construction projects due to poor documents in supply chain management. This study was limited to building construction projects in Sri Lanka. Agreement errors of labour suppliers and material suppliers were the main areas of concern. In order to achieve the objectives of the research, semi-structured interviews were conducted among construction professionals such as site engineers, project managers, technical officers, and Quantity Surveyors. The results of the research revealed that the documents were not prepared correctly, which indirectly caused the project to be delayed. This could happen due to various causes, such as documentation errors that take a long time to be corrected, people are not aware of the documentation required in various stages of the supply chain, and the stakeholders are not aware of the procedures correctly for each of the scenarios. Findings further revealed that errors such as delays, arithmetic mistakes, and specification inaccuracies frequently disrupt operations. To address these issues, corrective actions tailored to each document type were detailed, emphasising early negotiation, skilled personnel involvement, and rigorous verification processes. The study contributes significantly to the field by offering practical solutions that enhance document accuracy, improve supply chain efficiency, and reduce project delays. These measures not only address immediate documentation issues but also provide a framework for maintaining high standards of documentation accuracy in the construction industry, ensuring smoother operations and successful project completions.