Line-Commutated Three-Phase Controlled Rectifier Using SCR

Three-phase six-pulse thyristor rectifier. Firing pulses control conduction angle, varying average DC output voltage and load current.

This model simulates a three-phase fully controlled bridge rectifier using six thyristors. Gate pulses are applied with a defined firing angle to control the average DC output voltage obtained from a three-phase AC supply. By adjusting the firing angle, the effect on output voltage, ripple, and load current can be observed.

The simulation includes the three-phase source, firing pulse generation, thyristor bridge, and measurement blocks. Output voltage and current waveforms are provided to study conduction sequence, commutation behavior, and the relationship between firing angle and DC output.

Main features

• Three-phase six-pulse thyristor bridge
• Firing angle control of SCRs
• AC to DC power conversion
• Measurement of output voltage and current
• Suitable for study of phase-controlled rectifiers and line-commutated converters