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STOPAR, K., PIHLER, J., KITAK, P.
MEASUREMENT OF ARC FURNACE ELECTRICAL PARAMETERS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 24
Electric-arc furnace is one of the most importance pieces of equipment in the liquid steel production. An electric arc furnace enables a plant to melt scrap as fast as possible with the maximum energy input. An electrical energy input depends on the secondary current and secondary voltage of the furnace transformer tap, influencing the electric-arc burning stability. Electric arc furnace should be driven as efficiently as possible. Therefore, we want to measure electrical parameters during operation of the electric arc furnace to obtain information on its behavior. A measurement of arc furnace electrical parameters is the subject of this article.
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.
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