Hand Calculation of Fault Currents involving Inverter-based Resources

[user1011]

Hello,

Nowadays, the inverter-based resources short-circuit characteristics are expressed in terms of Voltage-controlled current source (VCCS) data format on many short-circuit programs. VCCS data is a table comprising positive sequence voltage, inverter current and power factor angle values.

I want to perform hand calculations on short-circuits. Are there any resources or literatures that explains how to calculate the fault current involving IBRs? Short-circuit programs do these iteratively but there are no other details provided.

Thanks.