Why does a turbine with PMSG and full converter system draws reactive power when turbine is stopped or there is no wind?
The converter system should have provisions to provide reactive volt-amperes to inductive loads supplied by the generator. If the converter remains connected to an active grid when the generator is shut down, it may continue to supply reactive VA to those loads. Capacitors in the converter would be supplying VA to inductive loads, not drawing reactive power from the grid.