Login

 


Plenary Lecture

About the Possibility of Power Quality Improvement in Ultra-High Power EAF

Assistant Professor Manuela Panoiu
Electrical Engineering and Industrial Informatics Department
Engineering Faculty of Hunedoara
Polytechnic University of Timisoara
Romania
E-mail: manuela.panoiu@fih.upt.ro

Abstract: Electric arc furnaces, especially the ones of ultra-high power, are characterized by the fact that these influence the electrical power quality at the point of common coupling, so influencing other electrical consumers. Thus, the effects produced by the ultra-high power EAF can be as following: voltage gap, generation of harmonic currents and inter-harmonics, high reactive power consumption, the three-phase unbalance, etc. All these negative effects can be influenced by each other and in some cases, these can be accentuated. In order to improve the power quality, all negative factors must be taken into account.
This research presents a study of the influence of the harmonic currents, reactive power and unbalance load on the power quality. Therefore, in order to present this study, measurements of currents and voltages, in the primary and secondary windings of the transformer for an electric arc furnace were performed. Using these measurements the indicators of the electrical power quality were determined: total harmonic distortion for the currents and voltages (THDi, THDu), unbalanced factors, power factor and both, currents and voltage harmonics. These values were calculatedduring the elaborationof the charge. The measurements were made in an electric furnace that has the capacity of 100 tones and a complete charge is finalized in approximately 3 hours. This type of furnace exists in Romania on many industrial platforms.
For the power quality improvement the proposed solutions for the reactive power compensation, harmonic currents filtering and the balancing of the electrical load, will be presented below. These solutions proposed and presented in this research are as follow: design of filters for the harmonic currents, of an installation for the load balances and of an installation for the reactive power compensation. In order to analyze the effect of these proposed solutions, simulations were performed, using the PSCAD EMTDC environment. Simulations are based on the use of an electric arc model which allowssimulating the entire electric arc furnace installation. Therefore, many simulations have been made in order to determine the optimalparameters of the model so that the simulation results to be very similar with the measured one.Thus, the measured and simulated waveforms of currents and voltages of primary and secondary furnace transformer were compared.Also, measured and simulated power factor, unbalanced factors for the currents and the voltage measured and simulated, and also the harmonic distortion coefficients measured and simulated were compared.
After the model parameters were chosen, the simulations of the electric arc furnace installation have been performed without the use of the installations for the compensation- filtering-balancing, but also with these installations, separately and together.
Follow-up the simulations, the effect of these installations on the electrical power quality can be studied.

Brief Biography of the Speaker: Manuela Panoiu was born in 1965, graduate the Computer Science Faculty, Polytechnic University of Timisoara in 1989. She receives his PhD degree in Electrical Engineering in 2001 at Polytechnic University of Timisoara and is currently Assistant Professor at the Electrical Engineering and Industrial Informatics Department of Engineering Faculty of Hunedoara, Polytechnic University of Timisoara, Romania.
Her research interests focus on modelling and simulating systems, advanced computer programming and artificial intelligence.
She has until now published over 80 research papers in Journals and conferences and participate to 10 research projects.

Bulletin Board

Currently:

The conference program is online.

The Conference Guide is online.

The paper submission deadline has expired. Please choose a future conference to submit your paper.


WSEAS Main Site


NAUN Main Site

Publication Ethics and Malpractice Statement