A method for multiplexing high and low speed data transmission channels

Abstract

The invention provides a method for multiplexing high-speed and low-speed data transmission channels. The data frames exchanged by both parties for data exchange are composed of high-speed data segments and low-speed data segments; data exchange is carried out according to the data exchange cycle of the high-speed data; each Data exchange cycle, the high-speed data is completely written into the high-speed data segment, and a part of the low-speed data is written into the low-speed data segment; the low-speed data completes a part of the data exchange in each data exchange cycle, and after several data exchange cycles, completes All data exchange. It can take into account the real-time exchange of high-speed data and the upload of a large amount of low-speed data under the condition of effective data bandwidth. Through the low-speed data field, the low-speed data is sent in segments, which can meet the periodic exchange of a large number of data with lower refresh rate requirements without increasing the bandwidth requirements of the transmission channel.

Description

technical field [0001] The invention relates to the technical field of data transmission of flexible direct current transmission converter valves, in particular to a method for multiplexing high and low speed data transmission channels inside a valve controller. Background technique [0002] As a highly complex power electronic device, the flexible HVDC converter valve requires its valve controller to have strong computing and data exchange capabilities. The requirements for the data exchange capability of the valve controller are reflected in two aspects: one is based on periodic high-speed calculations, which require high-speed collection and transmission of the capacitor voltage, status, and faults of the converter valve sub-module, and at the same time, the calculated Each power module IGBT switch status, control and protection commands are issued quickly; second, a large amount of data with a low change rate of the sub-module needs to be collected, stored, displayed and...

AI Technical Summary

Problems solved by technology

With the further increase in intelligence of the soft-to-DC converter valve sub-module and the increase in the DC voltage level of the soft-to-DC converter station, the data to be transmitted in the valve controller data exchange cycle increases sharply, relying on the original single data exchange cycle The method can no longer meet the requirements, and a data exchange mechanism is urgently needed to meet the high-speed data cycle exchange and low-speed data mass upload at the same time

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