Reactive power compensation

A Static VAR Compensator (SVC) is an electrical device for providing fast-acting reactive power compensation on high-voltage electricity transmission networks to control dynamic voltage swings under various system conditions and thereby improve the power system transmission and distribution performance. SVCs are part of the Flexible AC transmission system device family, regulating voltage and stabilizing the system. Electrical loads both generate and absorb reactive power. Since the transmitted load varies considerably from one hour to another, the reactive power balance in a grid varies as well. The result can be unacceptable voltage amplitude variations, a voltage depression, or even a voltage collapse. One of the main Application of SVC is in the steel making industries where the EAF and LF are working. Due to the reactive and active impulse caused by the operation of EAF, the system voltage is fluctuating and flicking. The harmonic current caused by EAF makes the voltage distortion. The 3-phase unbalanced load of EAF causes negative sequence component and reduces the power factor etc.
Major SVC Advantages in Steel Making Plants
SVC in Steel Making industries can,
  • • Increase power factor, which decrease losses of electric network and cost of production and increases productivity.
  • Reduce the reactive impulse to the network which avoids the pressure drop, voltage fluctuation and flicker of network, even reduce malfunction or shutdown of the driving and protection device.
  • Reduce high Order Harmonics Current which decreases network voltage distortion.
  • Reduce Three-phase unbalance of network and negative sequence current, which avoid the oscillation of electric engine rotor.