Sampling value transmission and synchronization method with path delay measurement function

Abstract

The invention provides a sampling value transmission and synchronization method with a path delay measurement function. The method of the invention comprises the steps of measuring data exchange delay on a switch of a process layer and synchronizing a message on IED equipment. According to the method of the invention, by measuring the data exchange delay on the switch of the process layer, uncertain dynamic delay of storage, queuing, forwarding and cascading of sampling value data in the switch is accurately accumulated and packaged into a sampling value message, and a compensation parameter is provided for a synchronization algorithm of the IED equipment; and in addition, the data structure of the existing sampling value message is expanded, a transmission delay correction field is added, and the position and length of the correction field can be configured. Transmission delay from a merging unit to a protection device is stored in the correction field, which enables the IED equipment to parse the parameter and apply the parameter to the synchronization algorithm after receiving the sampling value message.

Description

technical field [0001] The present invention relates to the technical field of data transmission and synchronization of sampling values ​​in digital substations (some areas are called digital substations, hereinafter collectively referred to as smart substations), and specifically relates to a sampling system with path delay measurement function applicable in smart substations. Value transfer and synchronization methods. Background technique [0002] In the smart substation, the sampling value is one of the basic data of the process layer, which is applied to relay protection, measurement and control, wave recording, metering and other systems. Various applications have strict requirements on the synchronization characteristics of the sampling value. The synchronous characteristic of the sampling value is affected by the merging unit, the transmission network and the IED equipment, etc., and is the result of a complex system working together. [0003] At present, there are ...

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Problems solved by technology

[0013] The main defect of scheme ② is that it can only be applied to point-to-point wiring, which leads to complicated wiring, a large demand for the number of ports of various devices, high construction costs, and the inability to achieve real data sharing.

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