A method in a power transmission system, the power transmission system comprising a plurality of interconnected converter stations, wherein operation of the converter stations can be controlled by means of providing at least one control signal to the respective ones of the converter stations, the method comprising: determining a pilot feedback signal, the pilot feedback signal being based on at least one voltage level in the power transmission system, wherein the pilot feedback signal is common for all of the converter stations; the method being characterized by: determining a power transmission system power flow parameter indicative of a difference between the power flow into the power transmission system and the power flow out of the power transmission system, wherein the power transmission system power flow parameter is determined based on the pilot feedback signal; for each of the converter stations, selecting one droop constant of two droop constants, each of the two droop constants having selected or predefined value corresponding to the sign of the power transmission system power flow parameter, for each of the converter stations, determining the droop parameter based on the selected droop constant, for each of the converter stations, determining a drooped error signal based on the droop parameter; for each of the converter stations, determining at least one control signal based at least on the drooped error signal determined for the converter station; controlling operation of the respective ones of the converter stations by providing each of the converter stations with the at least one control signal determined for the converter station. determining a pilot feedback signal, the pilot feedback signal being based on at least one voltage level in the power transmission system, wherein the pilot feedback signal is common for all of the converter stations; the method being characterized by: determining a power transmission system power flow parameter indicative of a difference between the power flow into the power transmission system and the power flow out of the power transmission system, wherein the power transmission system power flow parameter is determined based on the pilot feedback signal; for each of the converter stations, selecting one droop constant of two droop constants, each of the two droop constants having selected or predefined value corresponding to the sign of the power transmission system power flow parameter, for each of the converter stations, determining the droop parameter based on the selected droop constant, for each of the converter stations, determining a drooped error signal based on the droop parameter; for each of the converter stations, determining at least one control signal based at least on the drooped error signal determined for the converter station; controlling operation of the respective ones of the converter stations by providing each of the converter stations with the at least one control signal determined for the converter station. determining a power transmission system power flow parameter indicative of a difference between the power flow into the power transmission system and the power flow out of the power transmission system, wherein the power transmission system power flow parameter is determined based on the pilot feedback signal; for each of the converter stations, selecting one droop constant of two droop constants, each of the two droop constants having selected or predefined value corresponding to the sign of the power transmission system power flow parameter, for each of the converter stations, determining the droop parameter based on the selected droop constant, for each of the converter stations, determining a drooped error signal based on the droop parameter; for each of the converter stations, determining at least one control signal based at least on the drooped error signal determined for the converter station; controlling operation of the respective ones of the converter stations by providing each of the converter stations with the at least one control signal determined for the converter station.