Arrangement for limiting circulating currents (ic) in a converter converting between alternating current, AC, and direct current, DC, said converter having a number of AC and DC terminals (ACA, ACB, ACC, DC1, DC2) and comprising: a number of converter arms, where a first and a second converter arm (pal, pa2) are connected in parallel between a first DC terminal and a first AC terminal and two other converter arms are connected in parallel between a second DC terminal and the first AC terminal, each converter arm comprising a string (cs1, cs2) of series-connected converter cells, the arrangement comprising a control unit configured to obtain a first arm current running in the first converter arm and a second arm current running in the second converter arm sensed by current sensors in the first and second converter arms and, form an average (iparef) of the two converter arm currents, form a first error signal (ipa1e) between the first converter arm current and the average (iparef), form a first voltage control signal based on the average (iparef) using the first error signal, form a second error signal (ipa2e) between the second converter arm current and the average (iparef), form a second voltage control signal based on the average (iparef) using the second error signal, add the first voltage control signal to a modulation reference (rpa) in order to obtain a first converter arm control signal, use the first voltage control signal in the control of the voltage provided by the first converter arm comprising controlling the first converter arm using the first converter arm control signal and thereby controlling the cells of the first converter arm to provide a voltage on the AC terminal corresponding to the first converter arm control signal, add the second voltage control signal to a modulation reference (rpa) in order to obtain a second converter arm control signal, and use the second voltage control signal in the control of the voltage provided by the second converter arm comprising controlling the second converter arm using the second converter arm control signal and thereby controlling the cells of the second converter arm to provide a voltage on the AC terminal ACA corresponding to the second converter arm control signal. a number of converter arms, where a first and a second converter arm (pal, pa2) are connected in parallel between a first DC terminal and a first AC terminal and two other converter arms are connected in parallel between a second DC terminal and the first AC terminal, each converter arm comprising a string (cs1, cs2) of series-connected converter cells, the arrangement comprising a control unit configured to obtain a first arm current running in the first converter arm and a second arm current running in the second converter arm sensed by current sensors in the first and second converter arms and, form an average (iparef) of the two converter arm currents, form a first error signal (ipa1e) between the first converter arm current and the average (iparef), form a first voltage control signal based on the average (iparef) using the first error signal, form a second error signal (ipa2e) between the second converter arm current and the average (iparef), form a second voltage control signal based on the average (iparef) using the second error signal, add the first voltage control signal to a modulation reference (rpa) in order to obtain a first converter arm control signal, use the first voltage control signal in the control of the voltage provided by the first converter arm comprising controlling the first converter arm using the first converter arm control signal and thereby controlling the cells of the first converter arm to provide a voltage on the AC terminal corresponding to the first converter arm control signal, add the second voltage control signal to a modulation reference (rpa) in order to obtain a second converter arm control signal, and use the second voltage control signal in the control of the voltage provided by the second converter arm comprising controlling the second converter arm using the second converter arm control signal and thereby controlling the cells of the second converter arm to provide a voltage on the AC terminal ACA corresponding to the second converter arm control signal.