Eduards Antonovs

Elimination of nodes with voltage dependent load characteristics in electrical network models

This paper presents a new technique for the reduction of large power system. It is based on Jordan elimination of nodes represented with their static or dynamic load characteristics dependent on voltage. Thus the reduced network models preserve their past behavior with the same final outcomes in problems of steady states, static and dynamic electromechanical transient processes. We report an example of solving a nonlinear problem in Eurostag software

Interconnection of power systems with different under-frequency load shedding schemes

Development of power systems leads to new interconnections that can join power systems with different approaches regarding under-frequency load shedding (UFLS). Parallel operation of different UFLS schemes is analyzed in this paper considering possible UCTE / NORDEL and IPS / UPS interconnection. It is shown that due to differences between UFLS schemes the interconnections stability can be endangered.

Under-Frequency Load Shedding System

During emergency situations in the power system caused by generating power deficiency frequency decline can happen. Dynamics of underfrequency during deficiency of generation in the power system can have very different character. It depends on the value of disturbance, response of emergency automation and the governor system.