Time synchronization method suitable for power distribution network

A technology of time synchronization and distribution network, applied in electrical components, multiplexing communication, time division multiplexing systems, etc., can solve problems such as large cost, reduce cost, adjust resistance value conveniently, and achieve synchronization accuracy. high effect

Active Publication Date: 2021-03-12
SHENZHEN POWER SUPPLY BUREAU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods can only be applied to transmission lines with perfect communication conditions. The distribution network does not have such communication conditions. The above methods need to be used, which requires a lot of cost

Method used

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  • Time synchronization method suitable for power distribution network
  • Time synchronization method suitable for power distribution network
  • Time synchronization method suitable for power distribution network

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0047] In order to make those skilled in the art more clearly understand the purpose, technical solutions and advantages of the invention, the invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0048] like figure 1 As shown, it shows a schematic diagram of the main flow of an embodiment of a time synchronization method suitable for distribution network provided by the present invention, together with the structure figure 2 and image 3 As shown, in this embodiment, the application in the medium and low voltage distribution network includes the following steps:

[0049] Step S10, when the upstream...

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Abstract

The invention discloses a clock synchronization method for a medium-low voltage distribution network, and the method comprises the steps: injecting a time synchronization characteristic signal at a downstream protection device of a medium-low voltage distribution line, collecting a disturbance signal waveform at an upstream protection device, and recording a local time scale; enabling the downstream protection device to transmit a disturbance signal waveform through a carrier channel and print a local time scale when disturbance starts, and enabling the upstream protection device to determinethe time scale difference of devices at the two ends by calculating the relevancy of the two curves. By implementing the method, the current situation and characteristics of the medium-low voltage power distribution network are fully considered, the influence of channel delay is avoided, a special channel does not need to be additionally laid, and time unification and strict synchronization of sampling moments of two different places are realized at low cost.

Description

technical field [0001] The invention belongs to the field of distribution automation, in particular to a time synchronization method suitable for distribution networks. Background technique [0002] For line protection, the most effective way is the current differential protection. The algorithm of the current differential protection requires that the currents of each terminal participating in the comparison must be sampled or processed synchronously, which is the key to realize the current differential protection. The current differential protection can realize zero-second quick breaking of the fault line, and the principle is simple, and it is not affected by the voltage transformer. The ping-pong algorithm or the GPS clock signal are often used in transmission lines to achieve data synchronization. The medium and low voltage distribution network does not have such communication conditions. The implementation of current differential protection should fully consider the cu...

Claims

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Application Information

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IPC IPC(8): H02H7/26H04J3/06
CPCH02H7/26H04J3/06
Inventor 王廷凰
Owner SHENZHEN POWER SUPPLY BUREAU
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