A method for simultaneous operation of a plurality of chopper circuits of a wind turbine power converter, wherein each chopper circuit comprises a power dissipation member, the method comprising the steps of - operating a controllable switching member of a first chopper circuit in accordance with a first switching pattern, and - operating a controllable switching member of a second chopper circuit in accordance with a second switching pattern, wherein the first switching pattern is different from the second switching pattern during a first time period, and wherein the first switching pattern involves that the controllable switching member of the first chopper circuit is clamped during the first time period, wherein clamping of the controllable switching member of the first chopper circuit involves that this controllable switching member is constantly on during the first time period, wherein the second switching pattern involves that a modulation pattern having a given switching frequency is applied to the controllable switching member of the second chopper circuit during the first time period, and wherein the first switching pattern involves that a modulation pattern having a given switching frequency is applied to the controllable switching member of the first chopper circuit during a second time period immediately following the first time period, wherein the second switching pattern involves that the controllable switching member of the second chopper circuit is clamped during the second time period, and wherein clamping of the controllable switching member of the second chopper circuit involves that this controllable switching member is constantly on during the second time period. - operating a controllable switching member of a first chopper circuit in accordance with a first switching pattern, and - operating a controllable switching member of a second chopper circuit in accordance with a second switching pattern, wherein the first switching pattern is different from the second switching pattern during a first time period, and wherein the first switching pattern involves that the controllable switching member of the first chopper circuit is clamped during the first time period, wherein clamping of the controllable switching member of the first chopper circuit involves that this controllable switching member is constantly on during the first time period, wherein the second switching pattern involves that a modulation pattern having a given switching frequency is applied to the controllable switching member of the second chopper circuit during the first time period, and wherein the first switching pattern involves that a modulation pattern having a given switching frequency is applied to the controllable switching member of the first chopper circuit during a second time period immediately following the first time period, wherein the second switching pattern involves that the controllable switching member of the second chopper circuit is clamped during the second time period, and wherein clamping of the controllable switching member of the second chopper circuit involves that this controllable switching member is constantly on during the second time period.