A system (20, 21, 28, 30, 10-15) comprising at least one power electronics element (20,21, 28); at least one control unit; and a communications network for communication between the at least one power electronics element (20, 21, 28) and at the least one control unit, the at least one power electronics element and the at least one control unit being separately arranged, wherein the at least one control unit is configured to control the at least one power electronics element by means of transmitting at least one control signal to the at least one power electronics element, each of the at least one power electronics element and the at least one control unit comprising a transmit/receive unit configured to transmit and/or receive at least one signal, wherein the at least one power electronics element comprises a converter configured to convert high voltage DC to AC, or vice versa, said converter comprising a plurality of cells, wherein the at least one control unit is configured to control at least one of the plurality of cells by means of transmitting at least one control signal to the at least one of the plurality of cells, each of the plurality of cells comprising a transmit/receive unit configured to transmit and/or receive at least one signal, characterized in that the communication network comprising: at least one communication link (41, 42, 81-83, 121-124, 131-133) for communication of at least one signal over at least a part or portion of the communications network, wherein at least one communication link at least in part utilizes a wireless communication link (81-83, 121-124) and at least one communication link at least in part utilizes a wired communication link; and a plurality of intermediate transmit/receive units, each of which is configured to receive at least one signal transmitted over the communications network in a direction from the at least one power electronics element and to the at least one control unit, or vice versa, and transmit the received at least one signal over the communications network in a direction to the at least one control unit or the at least one power electronics element, respectively, wherein each of the plurality of intermediate transmit/receive units is configured to function as a repeater, wherein the intermediate transmit/receive unit re-transmits the at least one signal which the intermediate transmit/receive unit has received. at least one communication link (41, 42, 81-83, 121-124, 131-133) for communication of at least one signal over at least a part or portion of the communications network, wherein at least one communication link at least in part utilizes a wireless communication link (81-83, 121-124) and at least one communication link at least in part utilizes a wired communication link; and a plurality of intermediate transmit/receive units, each of which is configured to receive at least one signal transmitted over the communications network in a direction from the at least one power electronics element and to the at least one control unit, or vice versa, and transmit the received at least one signal over the communications network in a direction to the at least one control unit or the at least one power electronics element, respectively, wherein each of the plurality of intermediate transmit/receive units is configured to function as a repeater, wherein the intermediate transmit/receive unit re-transmits the at least one signal which the intermediate transmit/receive unit has received.