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Polyharmonic model of synchronous generator for analysis of autonomous power generation systems

100%

Kutt F. , Michna M. , Ronkowski M. , Chrzan P. J.

Maszyny Elektryczne : zeszyty problemowe

2011

tom Nr 4(92)

109-114

This paper presents the polyharmonic modelling of synchronous generator (SG) in machine variables. The simple geometry and windings physical layout has been used for inductance calculations of a salient-pole SG. The main advantage of this model is the ease of describing an autonomous power generation system (APGS) in terms of its topology and thus providing effective analysis at the static and dynamic states, both for normal and fault operations. Particularly, the model can be used to obtain SG voltage and currents for their more extensive harmonic analysis. Comparison of the simulation and measurement results has shown their good agreement, i.e., validating the elaborated polyharmonic model of SG.

UT1 prediction based on long-time series analysis

84%

Tissen V. , Tolstikov A. , Malkin Z.

Artificial Satellites : Journal of Planetary Geodesy

2010

tom Vol. 45, No. 2

111--118

A new method is developed for prediction of UT1. The method is based on construction of a general polyharmonic model of the Earth rotation parameters variations using all the data available for the last 80-100 years, and modified autoregression technique. A rigorous comparison of UT1 predictions computed at SNIIM with the prediction computed by IERS (USNO) in 2008-2009 has shown that proposed method provides better accuracy both for ultra-short and long term predictions.