A General Digital Computer Simulation Programme for Thyristor Static Converters (Programme SACSO) Application Examples

Publisher Summary The electric model chosen to represent the semiconductors is the first fundamental aspect in the conception of a simulation method. Both the accuracy and complexity of the simulation depend upon the exactness of the model chosen. The value of the resistance is determined by testing the voltage appearing across it. The introduction into the circuit of resistances of very different values causes a great dispersion in the various time constants present in the circuit. A method that overcomes this difficulty and at the same conserves a good degree of accuracy and a low computation time has consequently been chosen. The determination of the exact instant at which the semiconductors change their conducting state is one of the key points of the simulation. Remembering that the semiconductor model used is resistive, the conducting state of a semiconductor is determined according to the voltage across it and, in the case of a thyristor, its firing control signal.