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Digital transformer substation distribution testing method based on ZigBee wireless technology

A wireless technology, distributed testing technology, applied in digital transmission systems, information technology support systems, electrical components, etc., can solve problems such as different output methods and paths, transmission delay differences, etc., to eliminate clock deviation and information transmission delay. Time, reduce network load, reduce the effect of handshake times

Inactive Publication Date: 2013-06-26
深圳市康必达中创科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The key to the mixed output of analog quantities and digital substation digital quantities is still the synchronization problem between them. The digital signals need to be encoded and packaged by multi-channel digital simulation and analog comprehensive test devices and output through the optical fiber Ethernet port, and the analog quantities need to be converted by D / A. After becoming an analog small signal, it is output through the power amplifier. The output methods and paths of the two are different, and the transmission delay is also different, that is, there is also a signal synchronization problem between the two.

Method used

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  • Digital transformer substation distribution testing method based on ZigBee wireless technology

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Experimental program
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Embodiment 1

[0016] figure 1 As shown, the offset measurement: Since the ZigBee network allows nodes to join and leave instantly, the host cannot use the periodic multicast to send synchronization messages. Instead, the child nodes periodically send synchronization messages to the host, and the host receives After the synchronization message is processed, it sends its own time information (including packet processing time, Tm2~Tm1 in the figure) to the corresponding child node. After receiving this time information, the child node can calculate the clock with the host Offset. Considering that the system's requirements for synchronization accuracy are not particularly high, the child nodes do not send optional subsequent messages, which can also reduce the number of handshake times for each synchronization communication, thereby reducing network load.

Embodiment 2

[0018] It can be seen from the figure that after the synchronization message is sent, the child node does not send a delay request message again. This is because the transmission delay from the child node to the host can be calculated by using the time information in the offset measurement process. The method of calculating the delay here is different from the PTP protocol. The child node records the sending time of the synchronization message and the receiving time of the response message, and calculates the two time intervals, as shown in the figure Ts2~Ts1, and then subtracts the host’s packet The processing time, Tm2~Tm1 in the figure, regard the network as a symmetric network, and then divide by 2 to get the delay time between the slave clock and the master clock. At this point, the offset and delay have been calculated, and the child nodes adjust the time to achieve synchronization between the master and slave clocks. It can be seen that the clock synchronization principl...

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Abstract

The invention discloses a digital transformer substation distribution testing method based on the ZigBee wireless technology. A digital transformer substation control system comprises a process layer, a space layer and a transformer substation layer. Protection, measurement, control and measurement devices are arranged in the space layer; information between the space layer and the process layer are interacted according to sampling values of specific communication service mapping and generic object oriented substation events, and problems about analog simulation tests of the space layer with the primary devices mounted in a dispersed manner are solved. Different from results of utilization of a PTP (precision time protocol), after the clock synchronization principle is adopted, drift metering and delay metering are completed within one communication process rather than in two steps, so that handshaking times of synchronous communication are reduced, network load is lowered effectively, reliability in synchronization is improved while affection to network transmission performance is decreased.

Description

Technical field [0001] The invention relates to the field of electric power control, and in particular to a digital substation distributed test method based on ZigBee wireless technology. Background technique [0002] Digital substation has the characteristics of information digitization, communication network, and information sharing standardization. It can develop the foundation for advanced applications and is an important content of smart grid construction. At present, the performance of secondary equipment such as relay protection of digital substations in operation in China has not yet been effectively tested, which cannot meet the inspection and monitoring requirements of digital substations. [0003] The networking schemes and network structures of the station control layer, process layer and bay layer of the digital substation network are diverse. According to different network structures, the sampled value transmission network and the GOOSE network may be networked indep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L7/00H04J3/06H02J13/00
CPCH04J3/0667Y02E60/00Y04S10/16
Inventor 刘劲丁建义江峰林峰平晏文龙杨德勇刘健
Owner 深圳市康必达中创科技有限公司
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