Communication method and system

A communication node and communication channel technology, which is applied in the field of real-time operation data transmission, can solve problems such as data flow packet loss, and achieve the effect of improving reliability

Active Publication Date: 2011-12-14
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unreliable protocols, on the other hand, are lighter and faster, but data streams can be prone to packet loss

Method used

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  • Communication method and system
  • Communication method and system
  • Communication method and system

Examples

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Embodiment Construction

[0025] figure 1 Shown is a utility communication network having a first node or terminal 11, a second node or terminal 21 and (for example based on User Datagram Protocol (UDP) with unacknowledged transmission between the two nodes ) a wide area network (WAN) 30 as part of a non-deterministic communication channel. These two nodes 11, 21 are dedicated teleprotection devices located at the first substation 10 and the second substation 20 respectively, and are hardwired to a plurality of protective relays 12, 22 or other auxiliary equipment of the respective substation. The two nodes 11 , 21 may be interconnected via other communication channels (such as power line communication (PLC) channels) along the overhead power line 40 between the two substations 10 , 20 . The relays 12 , 22 are in turn connected to the main equipment of the substation and provide signals or statuses to be communicated, such as trip signals or commands related to remote protection functions of the overh...

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Abstract

The present invention increases reliability of communication over a non-deterministic communication channel, and is particularly suited for inter-substation teleprotection in electric power systems. A communication channel is being monitored based on regular network traffic, i.e. by evaluating messages or data packets carrying real-time operational data as a payload. A continuous determination of a channel quality, including appropriate alarming in case the channel quality is found insufficient, is based on an evaluation, at a receiving node, of data packets continually transmitted by a sending node. These continually or repeatedly transmitted data packets may comprise identical payloads reflecting current states rather than state changes as operational data.

Description

technical field [0001] The present invention relates to the field of utility communication, in particular, to the transmission of real-time operation data between remote sites of electric utility enterprises. It is based on the communication method described in the preamble of claim 1 . Background technique [0002] An electric utility or transmission system operator owns and operates an electric power transmission network that interconnects sites such as power sources and substations, which, although remote from each other by approximately 100km or more, must also be connected in one way or another to coordinate. On its utility communication systems, messages are passed over long-distance communication links between remote sites of utilities for the safe transfer and distribution of electrical energy. For some of these messages, in particular for teleprotection commands, the transmission delay between transmission and receiver is critical and should not exceed a few milli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04B15/00
CPCH04J3/0667H02H1/0061H02H7/261H04B2203/5458H04B1/69H04B3/54H04L43/062H04L43/0805H04L43/0864H04L43/16Y04S40/00
Inventor W·威默H·基尔曼H·斯皮斯S·拉姆塞尔A·诺特M·伊斯拉尔
Owner HITACHI ENERGY SWITZERLAND AG
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