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Generators are typically represented as Thevenin equivalent voltage sources in short-circuit calculations, and not as constant current sources, which is how a Type 4 WTG should be represented. The type 4 WTG will have a short-circuit contribution of approx 1.2pu current for a large range of retained voltages at its terminals (e.g. 0.9pu down to 0pu). When I have needed to represent this type 4 WTG behaviour as accurately as I can then I have written a Python script that adjusts the value of Zsource for the generator until you get the required value of current (1.2pu). This is not ideal, but it works.