Rakeshaxe

For single-phase and three-phase full converters, the derivation of output voltages, represented by the equations \( \frac{2V_{ml}}{\pi} \cos \alpha \) and \( \frac{3V_{ml}}{\pi} \cos \alpha \), assumes that the current transitions from the outgoing SCRs to the incoming SCRs occur instantaneously. This means that when the incoming SCRs T1 and T2 are fired in a single-phase full converter, the outgoing SCRs T3 and T4 are turned off as a result of the applied reverse voltage, causing the current to shift to SCRs T1 and T2 instantaneously. This condition holds true only if the voltage source has no internal impedance. In reality, the source does have internal impedance. If the source impedance is resistive, there will be a voltage drop across this resistance, reducing the average output voltage of the converter by \( I_0 \cdot r_s \) for a single-phase converter and by \( 2 I_0 \cdot r_s \) for a three-phase converter. Here, \( I_0 \) represents the constant DC load current, and \( r_s \