A hard real-time cascaded multi-node synchronous sampling and data transmission method

Abstract

The invention discloses a hard real-time cascading multi-node synchronous sampling and data transmission method. The method comprises the following steps: 1) dividing a cascading system into four layers; 2) determining a sampling interval Ts of the cascading system, dividing a physical channel into two logical channels: a real-time logical channel and a non-real-time logical channel; 3) orderly constructing devices in a second layer, a third layer and a fourth layer for synchronous sampling, synchronous transmission and link management in the cascading system; 4) computing a channel retardation of each layer; 5) reconstructing a local synchronous signal of a data combining and transferring device of the third layer, and a local synchronous signal of a data acquisition and control terminal of the fourth layer; 6) controlling data transmission by using sampling period Ts as rhythm. The extra time delay produced by physical link length and software protocol stack among a plurality of multi-stage cascaded acquisition control nodes in different physical distribution is solved, and the hard real-time transfer capability is provided for the key service data, the synchronous precision and real time property are high, the channel construction cost and the construction workload are low, and the good application prospect is realized.

Description

technical field [0001] The invention relates to a hard real-time cascading multi-node synchronous sampling and data transmission method suitable for a plurality of associated nodes scattered far away, and belongs to the technical fields of power system protection and industrial control. Background technique [0002] In the field of power system wide-area protection and wide-area process control, in order to accurately retain the phase information of the signal, or perform precise timing analysis on asynchronous events, it is necessary to collect a certain group of process variables at different locations and at equal intervals. In order to improve the real-time processing capability of the system and the response speed of asynchronous events, the sampling data of each process quantity acquisition and control device can be uploaded in real time, and the command setting information of the processing device needs to be sent to the actuator or adjustment mechanism in real time. S...

AI Technical Summary

Problems solved by technology

[0014] In order to overcome the deficiencies and defects of the prior art, the hard real-time cascaded multi-node synchronous sampling and data transmission method of the present invention solves the problem of physical link between a plurality of multi-level cascaded acquisition control nodes with different physical distributions. The additional delay caused by the length of the channel and the software protocol stack and the ability to provide hard real-time forwarding for key business data, high synchronization accuracy and real-time performance, low channel construction costs and construction workload, have good application prospects

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