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1.
Exploring the possibilities of adjusting gensets to NATO requirements
Dejan Barešić, Željko Hederić, Miralem Hadžiselimović, 2019, original scientific article

Abstract: Stationary and mobile gensets are used in the Armed Forces of the Republic of Croatia. In this research, priority was given to mobile gensets which have a variety of uses. In addition to being used in the Republic of Croatia, the mobile gensets are also used in international military operations in various modes of operation. Therefore, it is necessary to be very familiar with their characteristics and the possibility of adjusting them to NATO requirements. For the purpose of the adjustment, a test was performed on a P-B40.R1 genset. A model that simulates the genset behaviour with different tested fuels was developed. The investigated genset, together with some others, was introduced into the Armed Forces pursuant to the Product Quality Protocol that was in force during the 1990s. The Protocol did not cover all requirements and recommendations for the genset operation in an international military environment. Therefore, research was conducted, which has resulted in the adjustment of the equipment and in the harmonisation of the Product Quality Protocol with the ISO standard and NATO requirements. When adjusting the materiel, special emphasis is given to defining certain genset types that are able to use the modified F-34 kerosene-type fuel instead of diesel fuel. The F-34 fuel is obtained from kerosene used in aviation; this fuel can be easily obtained in international military operations where the tendency is to use the same type of fuel for airplanes, vehicles, and diesel engine equipment. When F-34 is used as the genset fuel, the quality of the generated electrical energy might be reduced. For the purpose of bringing the output characteristics of the generator within prescribed limits, simulations were performed both with and without the tuning of the regulation parameters.
Keywords: genset, F-34 fuel, regulator adjustment, simulations
Published in DKUM: 22.02.2024; Views: 29; Downloads: 1
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2.
Experimental verification of the numerically determined parameters for the non-linear two-axis model of a synchronous motor with interior permanent magnets
Željko Hederić, Venco Ćorluka, Toni Varga, 2021, original scientific article

Abstract: Synchronous machines belong to the family of electrical machines characterised by a synchronous magnetic rotating field in the air gap of the machine, the speed of which depends on the frequency of the currents in the armature winding. The paper presents procedures and methods for the numerical determination and experimental verification of the parameters for a nonlinear two-axis model of a synchronous motor with permanent magnets in the rotor (IPMSM) and a concentrated stator winding. To calculate the distribution of electro-magnetic fields in the motor accurately, models with distributed parameters are used in motor design, for which the Finite Element Method (FEM) is usually employed. The improvement by using the model with concentrated parameters considerably simplifies the physical model, by describing it with a system of (non)linear differential equations, the so‐called partial differential equations, which is presented in this paper.
Keywords: synchronous motor, flux linkage, interior permanent magnets, non-linear
Published in DKUM: 13.11.2023; Views: 114; Downloads: 3
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3.
Transition to a common 20kV distribution network
Damir Crnković, Željko Hederić, Miralem Hadžiselimović, 2012, original scientific article

Published in DKUM: 10.07.2015; Views: 1928; Downloads: 64
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