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A. Obushevs
Laboratory for Power System Mathematical Modelling, Institute of Physical Energetics, Latvian Academy of Sciences, 21 Aizkraukles Str., Riga, LV-1006, LATVIA
I. Oleinikova
Laboratory for Power System Mathematical Modelling, Institute of Physical Energetics, Latvian Academy of Sciences, 21 Aizkraukles Str., Riga, LV-1006, LATVIA
A. Mutule
Laboratory for Power System Mathematical Modelling, Institute of Physical Energetics, Latvian Academy of Sciences, 21 Aizkraukles Str., Riga, LV-1006, LATVIA