The switching of the load is realized via the output power SSR relays, and is executed either by using the phase-control algorithm, or by using the full-wave control algorithm.
The voltage changes are solely of rectangular shapes for the full-wave control and thus, there are simplified approaches which may be used.
5 kW of heating power the short time flicker will be exceeded, and thus, apart from the difficulties with control loop, this full-wave control is not suitable for direct connection to the distribution network.
The experimental measurement carried out on the annealing unit prototype and its analyses show that in case of full-wave control, the production of harmonic current can be suppressed.
Start-up of the annealing unit using full-wave control algorithm.