Faculty of Electrical Engineering and Information Technologies

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Now showing 1 - 10 of 103
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    The Impact of Plug-In Hybrid Vehicles in Low-Voltage Distribution Systems Using a Monte Carlo Simulation
    (Journal of Energy Technology, JET Volume 16, Issue 1, p.p. 11-22, june 2023, 2023-06)
    E. Smilkoska, V. Zdraveski, J. Vuletić, J. Angelov, M. Todorovski
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    Optimal Dispersed Generation Placement in Radial Distribution Systems Using a Pattern of Load Flow Procedure – Clustering Optimisation
    (Journal of Energy Technology, JET Volume 16, Issue 2, p.p. 23-46, september 2023, 2023-09)
    A. Popova, J. Vuletić, J. Angelov, M. Todorovski
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    Assessment of the Future Flexibility Needs of the Macedonian Power System
    (Journal of Electrical Engineering and Information Technologies, Vol. 8, No. 2, pp 69–82 (2023), 2023-09)
    S. Malčeski, S. Kuzarevski, J. Vuletić, J. Angelov, M. Todorovski
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    Impact Analysis of a Renewable Energy Source in a Network of a Large Industry
    (XIII Cigre-North Macedonia Conference, 5-7 October, 2025, Ohrid, North Macedonia, 2025-10)
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    V.Zdraveski
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    Optimal sizing and placement of D-SVC in radial distribution systems using an exhaustive analytical search
    (SAGE Publications, 2022-06-02)
    Malčeski, Stojan
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    Vuletić, Jovica
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    Angelov, Jordančo
    <jats:p>Throughout the past few decades, the share of distributed generation in power systems has increased continuously. This increasing trend coupled with the continuous demand growth in the distribution systems started a shift towards heavier reactive power consumption. The latter paved the way for the development of advanced operational and planning algorithms for power distribution systems. Following these trends in the distribution systems, the distribution grids must be developed with greater reliability and flexibility, i.e. smart grids. Consequently, the implementation of smart technologies instead of traditional ones should be considered wherever feasible. This paper presents an approach for optimal placement, economic sizing, and operation point search of distribution static VAR compensator (D-SVC) using an exhaustive analytical search. The proposed algorithm introduces quite a few novelties, unique, superior, and repetitive results presented on a distribution test system IEEE 69.</jats:p>
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    Maximum Power Point Determination of Bifacial PV Using Multi-Verse Optimization Algorithm Applied on Different Cell Models
    (Sciendo, Warsaw, Poland, 2025-03)
    Angela Najdoska and Goga Cvetkovski
    In the design process of a photovoltaic (PV) power plant the determination of the maximum power that can be extracted from the PV modules in a plant is essential, especially for the dimensioning of the individual parts of the plant. This paper presents the determination of the maximum power point of a bifacial photovoltaic system using three different cell models. The optimal power point is determined by using a novel multi-verse optimization algorithm (MVO), as an optimization tool. In this research work the maximum power point of bifacial photovoltaic modules is determined by using the following three photovoltaic cell models such as: ideal single diode model, real single diode model and two diode model of photovoltaic cell. The above-mentioned cell models are developed for single sided PV mod-ules and therefore a proper modification of those models is necessary in order to be applied for the investigated modules. The purpose of this optimization procedure is to determine the maximum power of a bifacial PV module by minimising the power difference between the calculated power and the experimentally determined power for certain atmospheric conditions.
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    Load supplying capability under uncertain power demand conditions
    (Elsevier BV, 2024-12)
    Zdraveski, Vasko
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    Angelov, Jordanco
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    Vuletic, Jovica
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    Optimized Scheduling Transmissions for Wireless Powered Federated Learning Networks
    (Institute of Electrical and Electronics Engineers (IEEE), 2025-03)
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    Poposka, Marija
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    Hadzi-Velkov, Zoran
    We have developed a resource allocation scheme that minimizes the training process of federated machine models in the wireless powered communication networks. The new resource sharing method allows energy harvesting (EH) clients (EHCs) to train their local models for extended periods that overlap with data transmissions of other EHCs. Training latency minimization leads to mixed integer non-convex problem, which is tackled by exploiting the sensitivity properties of the corresponding Lagrange multipliers. If the local training models at all EHCs use equal size datasets, the optimal transmission order is in the decreasing order of the EHC-base station channels gains. The proposed resource allocations significantly reduce the training latency compared to the state-of-the-art benchmark schemes.
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    Investigation of shaded pole stator topology for low power AC motors design
    (Emerald, 2024-06-26)
    Lidija Petkovska
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    Goga Vladimir Cvetkovski
    Purpose:This paper aims to investigate the features of single phase shaded pole stator with squirrel–cage rotor or permanent magnet rotor, that leads to an investigation of these topoloties as induction motor or synchronous motor. The comparative analysis is realised for the following three topologies: single phase shaded pole induction motor (SPIM) with squirrel–cage rotor, the second topology (single phase synchronous motor) has the same stator configuration but with permanent magnet rotor and the third investigated topology is similar to the second one, where the stator poles instead of iron steel are made of soft composite material.Design/methodology: The investigation in this work starts with a performance analysis of single-phase SPIM. Afterwards for the same stator topology the squirrel rotor is replaced with a two-pole permanent magnet rotor and the same performance analysis is realised for this topology. Finally, the second topology is improved bay replacing the iron steel stator poles with stator poles made of soft magnetic composite material and performance analysis is realised for this third type of topology as well. The performance analysis of all topologies is realised by implementation of finite element method and finite element analysis.Finding: The presented data and diagrams from the realized investigation show that single phase synchronous motor with shaded pole stator has an improved characteristics in comparison with the initial single-phase SPIM. Finally, the third topology realized on the bases of the single-phase synchronous motor has the best performance characteristics due to the implementation of soft magnetic material in the realization of the stator poles. The proposed methodology for structural and performance improvement of a single-phase SPIM topology opens the possibility for additive manufacturing application and significant cost reduction.Originality/value: The focus was put on exploration the possibilities of the single-phase shaded pole stator topology for application in low-power and low-cost single phase self-starting motors. By simple replacement of the squirrel–cage rotor, in the reference AKO-16 motor, with one-piece ferrite permanent magnet rotor, the self-starting single phase synchronous motor was derived. In the next step, owing to simplify the SPPM motor production process and manufacturing, the stator poles instead of iron steel lamination were made of soft composite material Somaloy®. It opens the possibility for additive manufacturing application and significant cost reduction.