A converter device arranged to convert power between a first high voltage direct current, HVDC, connection (DC 1), a second HVDC connection (DC 2) and an alternating current, AC, connection (U, V, W) the converter device comprising: a first power converter (1, 1a-d) comprising at least one phase leg (3a-c) provided between terminals of the first HVDC connection (DC 1), each one of the at least one phase leg comprising a positive arm (7a-c), an inductor, an AC connection (U, V, W) and a negative arm (8a-c), arranged serially between the terminals of the first HVDC connection (DC 1), wherein each one of the positive arm (7a-c) and the negative arm (8a-c) comprises converter cells and one of all the converter cells is a first host converter cell, each converter cell comprising at least two main switching elements (14a-d) and a storage element, two of the at least two switching elements (14a-d) being arranged serially in a converter switching element string, the converter switching element string being connected in parallel with the energy storage element, characterised by a power converter section (4, 4a-b) comprising a first converter cell comprising at least two switching elements (15a-d), two of the at least two switching elements being connected serially in a first switching element string, the first switching element string being connected in parallel with the energy storage element of the first host converter cell, wherein a point between the two switching elements of the first converter cell is connected to a first terminal of the second HVDC connection (DC 2); wherein the converter device is arranged to control the switching elements of the first switching element string in dependence of the state of the main switching elements (14a-d) of the first host converter cell. a first power converter (1, 1a-d) comprising at least one phase leg (3a-c) provided between terminals of the first HVDC connection (DC 1), each one of the at least one phase leg comprising a positive arm (7a-c), an inductor, an AC connection (U, V, W) and a negative arm (8a-c), arranged serially between the terminals of the first HVDC connection (DC 1), wherein each one of the positive arm (7a-c) and the negative arm (8a-c) comprises converter cells and one of all the converter cells is a first host converter cell, each converter cell comprising at least two main switching elements (14a-d) and a storage element, two of the at least two switching elements (14a-d) being arranged serially in a converter switching element string, the converter switching element string being connected in parallel with the energy storage element, characterised by a power converter section (4, 4a-b) comprising a first converter cell comprising at least two switching elements (15a-d), two of the at least two switching elements being connected serially in a first switching element string, the first switching element string being connected in parallel with the energy storage element of the first host converter cell, wherein a point between the two switching elements of the first converter cell is connected to a first terminal of the second HVDC connection (DC 2); wherein the converter device is arranged to control the switching elements of the first switching element string in dependence of the state of the main switching elements (14a-d) of the first host converter cell.