NPC-IGCT Phase Module Clamp Circuit LRC Parameters Design Considering FRD Snappy Recovery

In this paper, a method for neutral point clamping-integrated gate commutated thyristor (NPC-IGCT) phase module clamp circuit parameters design considering FRD snappy recovery is present. Based on the snappy recovery theory, and analysis of snappy recovery factors, the paper has shown decreasing current commutating slope can attenuated snappy recovery affect effectively. Then, the paper has shown that it is reasonable for decreasing di/dt by increasing inductance of NPC-IGCT phase module clamp circuit, based on the circuit working principle. Then, the new clamp circuit parameters design method which combine multi-objective optimization solution mathematical module of the circuit, fast recovery diode (FRD) snappy recovery, devices overvoltage and loss is shown in paper. A design example and its test results have demonstrated both IGCT and FRD characteristics have been guaranteed and ensuring safety and reliability of the NPC - IGCT phase module.