The Graetz bridge valve group consists of an equivalent circuit of six thyristor valves configured as follows:
The numbering of the thyristor valves is also the firing order of the thyristors. Valve 2 is usually fired 60° after valve 1; valve 3 is fired 60° after valve 2, etc. The Graetz bridge calls the Thyristor component routine six times per time step.
The Interpolation Algorithm is automatically invoked by the Internal Phase Locked Oscillator (PLO) to interpolate all turn ON and turn OFF events (including Forward Break-Over) within the valve group. The resulting interpolated times are used to calculate the exact instant of switching for each thyristor.
Related Topics