Abstract
This paper presents a new approach for the dynamic compensation of flicker and harmonics in arc furnace power systems based on the UPFC. An arc furnace induces different kinds of disturbances caused by the harmonics and transient over voltage during the melting of scraps. Dynamic compensation is needed to improve the efficiency of process and to mitigate the disturbances caused to the network. The arc furnace load actually looks like a voltage source of harmonics behind a series of impedance consisting of the secondary cables to the electrodes. The UPFC with series active compensation capability opposed to variations of the arc resistance and suppress voltage flicker at the source. The design and control strategy of the UPFC based on the instantaneous power calculation are detailed by this paper. A typical arc furnace and UPFC model has been implemented in digital simulator to demonstrate how the UPFC can be controlled to take care of all disturbances