An improved technique for the estimation of local frequency, fundamental component phasor and instantaneous symmetrical components

Abstract

Generation of electrical energy in large conventional power plants (thermal, hydro and nuclear) in last ten years worldwide is being supplemented by small generation utilities that are fuelled by renewable sources, waste etc. In Republic of Croatia few years ago first small power plants projects were started. One such project was constructing small thermal power plant as a part of sanitary landfill treatment process in Zagreb, capital of Republic of Croatia. It is first power plant in Republic of Croatia of that kind which is fuelled by landfill gas that is result of decomposition process. After the commissioning of small thermal power plant (STPP) Jakusevec a detailed analysis of voltages and currents at the point of connection to the local distribution network was conducted. Results of that analysis are given in this paper.

Active Suppression of Low-frequency Interference Currents by Implementation of the High-performance Control System for the Grid-interfaced Converters

“…There are many algorithms for the phase-angle estimation of the line voltage. More detailed overview of phase-angle estimation techniques, employed in grid-interfaced converter applications is given in [59][60][61][62][63][64][65][66][67][68][69][70]. Actual value of the line voltage and its frequency are very often additional outputs from the estimation algorithm.…”