Download Harmonics and Flicker Analysis in a Three phase

Harmonics and Flicker Analysis in a Three phase Arc Furnace Electrical
Power Systems
Amarjeet Singh1
Email id: [email protected]
Dept. Of Electrical & Electronics Engg SMS Lucknow
Ravindra Kumar Singh2
Email id: [email protected]
Dept. Of Electrical Eng MNNIT Allahabad
Abstract - An electric arc furnace is a highly non-linear, time-varying load which gives rise to
harmonics, Interharmonics and voltage flicker and voltage
fluctuation. The harmonics are
mainly related to the non-linear voltage-current characteristic of the arc while the voltage
fluctuations are due to the arc length changes that occur during the melting of the scrap. The
current and voltage harmonic distortion leads to several problems in electrical power systems,
namely incorrect operation of devices, premature ageing of equipments, additional losses in
transmission and distribution electrical networks, overvoltages and overcurrents. This paper
presents the accurate evaluation of harmonics and flicker produced by ac electric arc furnaces
and its propagation through transmission and distribution systems in the electric network. The
perturbations caused by electric arc furnaces are of random nature and encompass a frequency
range from DC to a few hundreds of Hz. Depending on whether AC of DC is used to supply the
electric arc furnace there are unbalances, harmonics, inter-harmonics or voltage flicker in the
frequency range between 0-30Hz. It is presented a typical case where a high voltage system
supplies an electric arc furnace. The electrical network is simulated using MATLAB where a
non-linear time-varying three-phase arc model is implemented .
Keywords: Arc Furnace Modeling, MATLAB Simulation, Harmonics, Flicker.