Redundant Transmission of Data Messages For Information and Control For HVDC Transmission Systems

Abstract

A method for securely transmitting data messages between at least one transmitting unit and at least one receiving unit of an HVDCT system. Each transmitting unit is connected to each receiving unit via at least two connection channels. Each data message is provided with a message counter that uniquely characterizes the data message, and each transmitting unit transmits the data message to each receiving unit via all of the connection channels. The message counter is calculated using an incrementing rule that is clocked by the transmission of the data messages. Each receiving unit uses the same incrementing rule, which is clocked by the reception of data messages, to calculate a comparison counter. Each transmitting unit stores data messages which have already been transmitted in a transmission buffer, and the receiving unit compares the message counter of each received data message with the comparison counter. If the message counter and the comparison counter do not match, a repetition request is transmitted to the transmitting unit for the purpose of transmitting a message counter that corresponds to the comparison counter. After the repetition request has been received, the transmitting unit accesses the transmission buffer, and the data message whose message counter corresponds to the comparison counter received by means of the repetition request is transmitted via all of the connection channels. Data are interchanged more quickly between a transmitting unit and a receiving unit of an HVDCT system and the increased security requirements of such a system are simultaneously satisfied.

Dependencies are inferred from the claim text.