Browsing by Author "Jayaweera, SS"

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    item: Conference-Full-text
    Hardware and control design of a novel three phase grid tie inverter system
    (Institute of Electrical and Electronics Engineers, Inc., 2021-09) Karunadasa, JP; Jayaweera, SS; Kumara, HPNN; Jayasooriya, JASH; Abeykoon, AMHS; Velmanickam, L
    Renewable energy-based power generation has become the main focus in the energy field due to the growing concerns over the environmental effects of conventional energy systems. With the advancement in technology, the integration of Solar Photovoltaic (PV) systems into the utility grid has increased over the past few years. Solar PV systems typically generate DC electricity, while the conventional electricity grid is AC of constant voltage and constant frequency. This necessitates the design of low-cost, highly efficient power conversion systems to ensure maximum power capture from solar panels. This paper presents a hardware and control design of a fully controllable source to grid interconnecting system for Solar PV systems with Maximum – Power – Point - Tracking (MPPT). In the proposed system, a Four -Phase Floating Interleaved Boost Converter (4P - FIBC) which is an enhanced boost converter is utilized to have a cost-effective and efficient power conversion. A d-q transformation-based current controlled mechanism is to control the Voltage Source Inverter (VSI). The synchronization between the inverter and the grid is achieved through Phase Locked Loop (PLL) technique. The design is modeled and simulated in MATLAB Simulink. The paper presents the simulation results of the system to verify the system model.
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    item: Conference-Full-text
    Multi depth-velocity filters for enhancing multiple moving objects in 5-d light field videos
    (IEEE, 2020-07) Liyanage, N; Jayaweera, SS; Edussooriya, CUS; Wijenayake, C; Madanayake, A; Agathoklis, P; Bruton, L; Ambikairajah, E; Weeraddana, C; Edussooriya, CUS; Abeysooriya, RP
    A moving object in a five-dimensional (5-D) light field video (LFV) can be selectively enhanced using the depth and the velocity of the object. In this paper, a 5-D depth-velocity (DV) filter is proposed to enhance multiple moving objects at different depths and with different velocities in an LFV. The 5-D DV filter is designed as a cascade of an infinite-extent impulse response multi-depth filter and a finite-extent impulse response multi-velocity filter. Experimental results obtained with numerically generated and real LFVs indicate that more than 15 dB improvement in signal-to-interference ratio can be achieved with the proposed 5-D multi DV filter compared to previously proposed multi depth-only filters.
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    item: Article-Full-text
    Multi-Volumetric refocusing of light fields
    (IEEE, 2021) Jayaweera, SS; Edussooriya, CUS; Wijenayake, C; Agathoklis, P; Bruton, LT
    Geometric information of scenes available with fourdimensional (4-D) light fields (LFs) paves the way for postcapture refocusing. Light field refocusing methods proposed so far have been limited to a single planar or a volumetric region of a scene. In this paper, we demonstrate simultaneous refocusing of multiple volumetric regions in LFs. To this end, we employ a 4-D sparse finite-extent impulse response (FIR) filter consisting of multiple hyperfan-shaped passbands. We design the 4-D sparse FIR filter as an optimal filter in the least-squares sense. Experimental results confirm that the proposed filter provides 63% average reduction in computational complexity with negligible degradation in the fidelity of multi-volumetric refocused LFs compared to a 4-D nonsparse FIR filter