DETERMINING THEVENIN EQUIVALENT MODEL FOR A CONVERTER

A method for determining a converter Thevenin equivalent model (52) for a converter system (12), comprises: receiving measurement values of a coupling point voltage (vm) and of a coupling point current (im) measured at a point of common coupling (24) between a grid emulator system (14) and the converter system (12), wherein the grid emulator system (14) supplies the converter system with a supply voltage; and determining a converter Thevenin impedance (zd(ω)) and a converter Thevenin voltage source (vd(ω)) of the converter Thevenin equivalent model (52) by inputting the measurement values of the coupling point voltage (vm) and of the coupling point current (im) into a coupled system model (58), which comprises equations modelling the converter system (12) and the grid emulator system (14) and from which the converter Thevenin impedance (zd(ω)) and a converter Thevenin voltage source (vd(ω))) are calculated.