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The aim of this paper is to analyse effects of sudden change load as well as failures, such as short term interruption in power supply, on isolated electrical grid, e.g. ship's electrical grid. The autonomous operation of the synchronous generator is characterized by a change in steady state which causes a change in voltage and frequency, what in turn affects the quality of electric power systems...
The aim of this paper is to analyze behavior of isolated power system in case of short-term interruptions that is applied on one of the loads fed from the grid. Developed mathematical model of the system under consideration involves gen-set, prime mover and synchronous generator, and induction motors as active consumers. The aim of this paper is to analyse effect of short-term interruptions from the...
The aim of this paper is to explore the effect of implementing of dynamic cross saturation in modeling of synchronous generator. The mathematical model of a saturated salient pole synchronous generator is developed and two cases are analyzed. In the first case the cross-magnetizing phenomenon in the saturated synchronous machine (the magnetic coupling between its direct and quadrature axis) is included,...
Calculation parameters of power system stabilizer parameters were carried out by numerical procedure which is based on an analysis of the sensitivity of eigenvalues. Mathematical model of synchronous generator is identified using extended Kalman filter, with data recorded on real system.
The aim of this paper is to analyze dynamics of isolated electrical grid during short term interruptions. The effect of short term interruptions of the power supply on the characteristic values of synchronous generator in autonomous operation is analyzed. Dynamical loads (two induction motors), are connecting to the grid. Short-term interruptions that occur in different moments allow analyze of this...
The paper describes a procedure for identification of single machine infinite bus system. Mathematical model of synchronous generator is identified using data obtained from monitoring system. To determine the model parameters of the synchronous generator, a procedure based on Kalman filter was applied. The identified model of the synchronous generator can be used for parameter setting of the voltage...
The paper presents the results of studying the specific problems that occurred during the exploitation of two 42 MVA bulb generators. The work focuses particularly on two groups of problems which were more pronounced on only one of the two hydropower units, and these are increased vibrations of the hydropower unit and electromechanical oscillations in the stationary and transition states, which significantly...
The aim of this paper is to analyse effects of power supply interruption on dynamics of induction motors connected to a synchronous generator in an autonomous operation. A complex mathematical model has been developed, whose components are: a diesel engine, a synchronous generator, a mechanical connection, and two unregulated induction motors which are fed directly from the synchronous generator terminals.
The paper analyses the dynamics of generator-units, as well as induction motors during impact loads. Mathematical model of integral motor drives consisting of: diesel engine, synchronous generator and motor drives has been developed. The aim is to compare torsional dynamics during direct-on-line starting of induction motors with changing loads.
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