U radu je predstavljen istraživačko-razvojni projekt (engl. Industrial Research and Innovation - IRI) novog sustava zaštite, mjerenja i upravljanja za primjenu u elektroenergetskom sustavu (EES). ...Sustav zaštite, mjerenja i upravljanja koristi nove funkcionalnosti - kako zaštitne tako i komunikacijske, poboljšale su se i objedinile postojeće funkcionalnosti, te znatno proširilo područje primjene. Projekt je dio cjelokupnog razvoja nove platforme naprednih mikroprocesorskih ugradbenih sustava (engl. Embedded Systems) za regulaciju, zaštitu i upravljanje u EES-u. Nova platforma temelji se na distribuiranim modularnim funkcijama (hardverskim i softverskim) koje se komunikacijski povezuju u cjeloviti napredni sustav. Tehničko-ekonomska opravdanost projekta povećava se jer se na istoj platformi, kao izvedenice, kasnije mogu realizirati i drugi slični uređaji za regulaciju i upravljanje procesima u elektroenergetici.
Because of many different instability reasons, power unit stability problems should be analyzed in details for each specific case. This paper describes a specific case of power oscillations problem ...of hydroelectric power unit with double regulated bulb turbine. In some working conditions, natural frequency of electromechanical oscillations could be close to the rotor speed frequency and small disturbance on turbine would be amplified few times because of electromechanical resonance. Influence of operating conditions on natural frequency is analyzed using mathematical model of synchronous machine with excitation system. Simulation model results show that natural frequency decreases significantly with active power increase and near maximum active power becomes close enough to the rotor speed frequency to enter resonance mode.
The paper describes through the examples the excitation system in small hydro and wind units with a synchronous generator. The specificities depending on its application are emphasized. The ability ...to minimize differences in hardware and software in order to achieve the universal product in terms of production, without losing the quality of a product is described.
