A Method for Accurately Controlling Timing Switch Output in Distributed System

Abstract

The invention discloses a method for accurately controlling the output of the timing switching value in a distributed system, comprising the following steps: obtaining the PPS interval through a hard bus synchronization signal; calculating the deviation of the local crystal oscillator; obtaining the relative time difference and the exit state of the timing switching value output; calculating the exit The time difference between the timing outlet of the board card and the PPS time; when the timing is interrupted or triggered according to the timer function, the timing switch output, the distributed system of the present invention can accurately control the timing switch output method, which can break through the control board. The limitation of I / O control, through the inter-board communication mechanism and the coordination between boards and cards, ensures the control accuracy of the timing exit, and provides a solution for the application scenarios that require accurate timing exit.

Description

technical field [0001] The invention relates to a method for precisely controlling timing switch output, in particular to a method for precisely controlling timing switch output in a distributed system, and belongs to the technical field of power grid control and industrial control. Background technique [0002] In the field of power grid control and industrial control, there are application requirements that require timing switch output control. For example, in the field of secondary control of the power grid, the circuit breaker phase selection control equipment needs to achieve precise timing exit in a specific phase. [0003] With the development of processor technology and embedded control technology, the control unit adopts distributed, standardized and modularized ideas for board design. In the distributed system, the control board realizes information exchange with the exit board through the backplane communication bus to control the relays on the exit board. The ac...

AI Technical Summary

Problems solved by technology

The accuracy of export control will be affected by factors such as information exchange message transmission delay, export board program control output interruption interval, etc., which reduces the time accuracy of control

[0004] In order to ensure the control accuracy, the conventional method is that the control board must realize the direct I / O control of the export relay. This method has limitations such as a large number of wiring, and a small number of control export boards and output nodes.

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