Power Quality Improvement for Three Phase Current Source Induction Heating Systems

With the increasing application of Induction Heating (IH) systems in various industries such as metallurgy, concerns about the harmonic effects and power quality of the power grid have been involved in the problems facing network operation engineers. This paper presents two methods to improve the power quality of three phase current source induction system. The two methods are active and passive solutions. One of the most important problem for current source IH systems is the start-up problem, which causes flicker at the PCC. For three-phase current source IH system an active solution with shunt active power filter and a passive solution with single tuned passive filters is used to improve harmonic distortions and sag voltages. In this paper the current source induction heating system is modeled and the transient and steady state behaviors of the system are simulated.