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BONE, G., RUDEŽ, U., MIHALIČ, R.
On-Line Identifiability of a Synchronous Generator by Linearized Equivalent
KOMUNALNA ENERGETIKA / POWER ENGINERING, 157
In this paper the identifiability of synchronous generator’s parameters from time domain measurements at the terminals using a linearized equivalent is examined and a decoupled brute force algorithm for identification is presented. The generator model has two windings on both, the quadrature and the direct axis of the rotor. Measurements are carried out at the terminals; therefore the instantaneous values for rotor’s angle and rotational speed are unknown. A synchronous generator operating in a single machine infinite bus (SMIB) system was simulated. Field voltage was simulated to undergo a rectangular pulse change and the electrical quantities at the generator’s terminals were measured. To search the values of generator’s parameters brute force algorithm was used, since it provides an insight into all possible parameter sets which satisfy the identification criteria. After it has been established that some measured variables are insensitive to changes of certain parameters, a multistage approach was justified; without it, brute force search would not be feasible. Since the dynamics obtained with various parameter sets nearly coincides with that of the original simulation it is concluded that the synchronous generator’s parameter identification using the eighth order model in a linearized set up is not generally possible.

RUDEŽ, U., MIHALIČ, R.
Impact of Considered SVC Implementation in the Slovenian Power System on Inter-Area ENTSO-E Oscillation Damping
KOMUNALNA ENERGETIKA / POWER ENGINERING, 191
During the planning process of possible future investments into the Slovenian power system, a need arose for the comprehensive analysis related to low-frequency inter-area oscillation damping of a static var compensator (SVC) device. The SVC device was initially considered for solving local steady-state voltage issues on highest 220 kV and 400 kV voltage levels in the region. As the SVC device features fast dynamic response, it seemed reasonable to verify whether its implementation benefits the operation of the entire ENTSO-E interconnection as well. The presented analysis was performed using a complex model for dynamic studies, comprising publicly available ENTSO-E model and internally constructed Slovenian power-system model, which was successfully tested and verified in the past. Modelling of the SVC device was achieved by means of available research publications dealing with the subject, both foreign as well as domestic. By implementing a simple damping strategy, the results showed a positive effect on a small-signal stability and indicated which inter-area oscillations can be successfully damped when considered devices are connected to the Slovenian high-voltage transmission network.

RUDEŽ, U., MIHALIČ, R.
POSSIBILITIES FOR UPDATING UNDERFREQUENCY LOAD SHEDDING PROTECTION IN THE SLOVENIAN POWER SYSTEM
KOMUNALNA ENERGETIKA / POWER ENGINERING, 19
In recent decades, the advantages of a fast development in the communication and computer technology have been successfully harvested in the majority of technological areas for updating various mechanisms and processes. Power system control and protection is no exception. However, in certain other countries actual implementation of modern technologies into power system control and protection mechanisms takes less time compared to Slovenia. In case of a sudden major generation unit outage severe underfrequency conditions appear in the power system and only a centralized gathering of measurements and global actions (e.g. use of WAMS and GPS technology) can represent an appropriate approach to a global problem. In such circumstances, underfrequency load shedding is in many times the last resort tool for avoiding a total power system blackout. Consequently, its appropriate actions are of great importance both from technological and economical point of view. As a current status of an underfrequency load shedding protection in the Slovenian power system is still on the traditional level, in this paper authors summarize some of known developed mechanisms, among which some of them might be considered as an actual possibility for an upgrade of current underfrequency scheme in the Slovenian power system to an adaptive level.

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