Understanding Natural and Forced Commutation Commutation, also known as line or natural commutation, operates on AC power. During the negative cycle of voltage, thyristors enter a reverse state producing no output current or voltage. In contrast to forced commutation requiring external circuits like inductance and capacitors for DC applications, natural commutation doesn't need such components.
Operation of Silicon Controlled Rectifiers (SCRs) An SCR is a unidirectional semiconductor device consisting of four layers that conducts only during positive half-cycles when gate pulses are applied at specific angles. It turns off automatically in the absence of sufficient holding current during negative cycles. This makes it suitable for controlled rectification processes.
Role and Behavior During Positive Cycles During positive cycles with zero alpha angle supply to gates, output voltages start from zero value while currents equal resistance values without any cross-voltage drop across conducting states due to active thyristor operation.