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Synchronous acquisition method of process layer network sampling data independent of time synchronization

A technology of synchronous acquisition and network sampling, applied in the direction of synchronization device, synchronization receiver, synchronization error correction, etc., it can solve the problems of network packet collision, long packet reception time, and little meaning of the receiver's phase-locked loop, etc. Achieve strong robustness and expand the scope of application

Pending Publication Date: 2022-03-11
SHANGHAI LEYUN ELECTRICAL TECH
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Problems solved by technology

But in fact, the jitter of the sampling value sent by the merging unit using FPGA technology is basically within 100ns, and it is of little significance whether the receiver uses a phase-locked loop
In addition, when network packets collide (especially when SV and GOOSE packets share the same network), the packet receiving time is relatively long (maybe up to 100us), and the method of applying phase-locked loop cannot meet the interpolation requirements

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  • Synchronous acquisition method of process layer network sampling data independent of time synchronization
  • Synchronous acquisition method of process layer network sampling data independent of time synchronization

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Embodiment Construction

[0025] In order to easily understand the technical means, creative features, goals and effects of the present invention, the present invention will be further described below in conjunction with specific illustrations.

[0026] see Figure 1-2 , a method for synchronous acquisition of process-level network sampling data that does not depend on time synchronization, and proposes the "ever equal interval state" solution to realize interpolation synchronous sampling without relying on time synchronization.

[0027] refer to figure 1 , this application provides a synchronization method for substation process layer network sampling data that does not depend on time synchronization. The specific process is as follows:

[0028] First, the preconditions are met. The preconditions include condition Ⅰ and condition Ⅱ. Condition Ⅰ is that the SV transmission is at equal intervals, and the transmission jitter error is less than 10us; The layer device must be able to receive at least 3 c...

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Abstract

The invention discloses a synchronous acquisition method of process layer network sampling data independent of time synchronization, and belongs to the technical field of power system sampling. The method comprises the following steps: meeting preconditions; defining a time mark and determining a state condition; judging whether the received SV message meets a state condition or not, and determining an SV message receiving state; and calculating interpolation moments corresponding to the states according to the states of the received SV messages. According to the method, network messages are not required to be collided or collided rarely, and synchronous sampling based on the interpolation method can be completed as long as the condition that at least three continuous frames of SV messages which can be received from the same merging unit are not blocked by other messages within a period of time is met. According to the method, the application range of the interpolation synchronization method is expanded, and the method has higher robustness and is suitable for most intelligent substations in networking modes.

Description

technical field [0001] The invention relates to a method for synchronously collecting sampling data of a process layer network that does not depend on time synchronization, and belongs to the technical field of power system sampling. Background technique [0002] The process layer merging unit (MU) of the smart substation outputs sampled value messages according to the IEC61850-9-2 standard protocol. The sampled values ​​of multiple MUs need to be synchronized when used in the protection, measurement and control devices of the bay layer. [0003] Currently, there are two methods to synchronize the sampling values ​​between multiple MUs. One method is to provide a unified synchronous clock system for the whole station to synchronize the time of each MU to ensure the synchronization of sampling between MUs, and to complete the sampling synchronization by aligning the sampling values ​​according to the sampling numbers of each MU on the bay layer device. This method is the sta...

Claims

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Application Information

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IPC IPC(8): H04L7/00
CPCH04L7/002H04L7/0079
Inventor 夏传红黄小川张瑞林海鹰
Owner SHANGHAI LEYUN ELECTRICAL TECH
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