NOVELTY - The method involves providing an input power terminal and an output power terminal. An active switching device connected between the input and the output power terminal is provided for the output terminal. A timing of switching the active switching device is controlled in a converter module (27). The switching is controlled by sending switching control signals from a master controller to the converter module, where each switching control signal containing a control message that has a duration that is equal to, or less than a cycle time.    USE - Method for controlling conversion of an input power into an output power in a converter module of a power converter (claimed) in a wind turbine. Can also be used for power converter used to control a variable speed electric motor, and power converter used in renewable energy appliances such as solar cell.    ADVANTAGE - The method ensures that serial communication links can be used to connect each individual converter module with the master controller, so that the flexibility of the information transferred is higher. The Method ensures that a radial communication system can be formed and data payload and bandwidth requirements of each communication link can be maintained small. The communication links used are full-duplex links, so that not only the switching control signals to be sent to the converter modules but also feedback signals like current feedback signals or voltage feedback signals, or other kinds of signals can be transferred from the converter modules to the central controller without using a time multiplexing scheme. The method ensures that connecting two converter modules in parallel or in series allows for increasing the power rating of a power converter. The signal generator can generate the control message in threefold, such that a voting module running a majority voting algorithm on a received control message in each converter module to be interconnected with the central controller, thus correcting single bit errors through the versions of the control message not containing the bit error. The number of control messages for which the CRC-check or majority voting is allowed to fail, so as to prevent the incorrect switching state over a too long time in respective converter module.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a power converter, comprising input power terminal.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a wind turbine with electrical equipment.    Wind turbine (1)    Turning rotor (3)    Rotor shaft (5)    Gear box (7)    Conveter module (27)