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Energy transition in municipalities – a model for sustainable renewable energy management
Sara Aneva, Dragan Minovski, Vasilija Sarac, 2025, izvirni znanstveni članek

Opis: This study explores optimal strategies for utilizing the electricity generated from already installed PV systems at the local level, aiming to reduce electricity costs and increase revenues through the sale of surplus electricity. Two scenarios are analyzed: (1) individual consumption of the generated electricity within each building and the sale of surplus electricity at the time of production, and (2) collective energy management through a municipal energy enterprise, where surplus electricity is distributed among buildings, and the remaining surplus is sold on the free market. By analyzing existing research and case studies, the study seeks to determine which strategy is more efficient regarding energy efficiency and financial viability, and to propose a model for the collective management of electricity generated from PV systems at the municipal level.
Ključne besede: PV systems, energy management, electricity cost reduction, surplus electricity, municipal energy enterprise
Objavljeno v DKUM: 16.06.2025; Ogledov: 0; Prenosov: 0
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Comparative analysis of synchronous motors
Vasilija Sarac, Goce Stefanov, Dragan Minovski, 2021, izvirni znanstveni članek

Opis: This paper compares the parameters, steady-state and transient characteristics of two different types of synchronous motors (SM) – a motor with surface mounted magnets on the rotor, and a motor with embedded magnets and squirrel cage winding, widely known as a line-start synchronous motor. The comparison is based on results obtained from analytical, numerical and transient models of both motors for the same output power of the motors. The models for obtaining transient characteristics allow comparison of acceleration of both motors taking into consideration that the line-start SM is a self-starting motor while the SM with surface magnets is always started with the aid of a PWM inverter. The results obtained from the analytical, numerical and transient models of the motors should assist in choosing the most cost-effective solution in terms of the type of the motor for the appropriate application.
Ključne besede: FEM models, synchronous motors, steady-state characteristics, transient characteristics
Objavljeno v DKUM: 13.11.2023; Ogledov: 420; Prenosov: 45
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