A method performed by a control system of a power electronics converter comprising a valve arrangement and being configured to be connected to a power grid, the method comprising: providing a grid-side current controller for controlling power output from the converter to the grid; as a first part of the controller, running a first feedback control algorithm with an input based on a difference between a predetermined current reference (I x,ref) and a first feedback current measurement (I x,meas,slow) of a current in the converter, wherein the first feedback control algorithm has a first control cycle time and includes at least proportional control using a proportional gain (Kp); as a third part of the controller, running (M 3) a third feedback control algorithm with an input based on the first feedback current measurement (I x,meas,slow), wherein the third feedback control algorithm has the first control cycle time and acts on an output (Y ctrl,out) from the first feedback control algorithm after Safe Operating Area, SOA, limits have been applied to said first feedback control algorithm output, said third feedback control algorithm including proportional control using the proportional gain (K P) but with a different polarity compared to the first feedback control algorithm; and as a second part of the controller, running (M 4) a second feedback control algorithm with an input based on a second feedback current measurement (I ABC,meas,fast) of the current, wherein the second feedback control algorithm has a second control cycle time and acts on an output (U conv,x,ref) from the third feedback control algorithm with the same polarity as the first feedback control algorithm and includes proportional control using the proportional gain (Kp); wherein the second control cycle time is less than the first control cycle time. providing a grid-side current controller for controlling power output from the converter to the grid; as a first part of the controller, running a first feedback control algorithm with an input based on a difference between a predetermined current reference (I x,ref) and a first feedback current measurement (I x,meas,slow) of a current in the converter, wherein the first feedback control algorithm has a first control cycle time and includes at least proportional control using a proportional gain (Kp); as a third part of the controller, running (M 3) a third feedback control algorithm with an input based on the first feedback current measurement (I x,meas,slow), wherein the third feedback control algorithm has the first control cycle time and acts on an output (Y ctrl,out) from the first feedback control algorithm after Safe Operating Area, SOA, limits have been applied to said first feedback control algorithm output, said third feedback control algorithm including proportional control using the proportional gain (K P) but with a different polarity compared to the first feedback control algorithm; and as a second part of the controller, running (M 4) a second feedback control algorithm with an input based on a second feedback current measurement (I ABC,meas,fast) of the current, wherein the second feedback control algorithm has a second control cycle time and acts on an output (U conv,x,ref) from the third feedback control algorithm with the same polarity as the first feedback control algorithm and includes proportional control using the proportional gain (Kp); wherein the second control cycle time is less than the first control cycle time.