Acquisition terminal of power distribution network capable of realizing data synchronization

Abstract

The invention discloses an acquisition terminal of a power distribution network capable of realizing data synchronization. The terminal comprises a master control unit (MCU) and a plurality of acquisition units, wherein, the acquisition units are connected with the MCU through buses; the MCU is used for periodically sending synchronous command frames carrying the current time and synchronous serial numbers to the acquisition units, and each synchronous command frame comprises a synchronous clock command frame and a synchronous sampling command frame; and the acquisition units are used for receiving the synchronous sampling command frames, calculating a telemetering vector through recording the number of the current sampling point, and sending the telemetering vector to the MCU, and the telemetering vector comprises a real part and an imaginary part of the telemetering vector as well as the corresponding synchronous serial numbers. In the invention, the MCU and the acquisition units perform networking communication through the buses, and data synchronization among the plurality of the acquisition units is realized by means of the synchronous command frames so as to avoid repeated data acquisition. Therefore, the acquisition terminal has the characteristics of good real-time property, and is easy for implementation; and data synchronization precision is ensured.

Description

technical field [0001] The invention relates to the field of power distribution automation terminals, in particular to a distribution network acquisition terminal for realizing data synchronization. Background technique [0002] In the terminal application of distribution network automation, the voltage and current that are required to be collected for certain application functions are collected synchronously, such as loop power calculation, etc., so that phase comparisons and calculations can be performed. Generally, for The monitoring terminal with multiple loops in the power distribution network includes both centralized and distributed structures. The monitoring terminal includes ring network cabinets, switching stations, and cable branch boxes. see figure 1 , figure 1 is a schematic diagram of a distribution network acquisition terminal in the prior art, such as figure 1 As shown, the terminal includes an acquisition unit 11, an acquisition processor 12 and a data ...

AI Technical Summary

Problems solved by technology

see figure 1 , figure 1 is a schematic diagram of a distribution network acquisition terminal in the prior art, such as figure 1 As shown, the terminal includes an acquisition unit 11, an acquisition processor 12 and a data storage 13 connected in sequence, wherein the acquisition unit 11 is used to acquire voltage 1, ... voltage n, current 1, ... current m, wherein, Both n and m are natural numbers greater than zero. In general, whether it is a centralized structure or a distributed structure, the existing technology realizes the synchronization of data in the same acquisition unit, and cannot realize the synchronization between data in different acquisition units. And what use is same sampling pulse, acquisition processor 12 and data memory 13, in addition, also there are following problems in practical application:

[0003] 1. Repeated collection of voltage, taking the ring main unit as an example, generally there are two sets of busbars in the ring main unit, and only two sets of busbar voltages need to be collected, but due to the need to realize the synchronization of voltage and current, each acquisition unit Both need to collect the voltage quantity, resulting in repeated collection of the voltage quantity

[0004] 2. Under the distributed structure, due to the large amount of voltage connected, if the amount of voltage connected is less, it is easy to make the error of the calculation result large

[0005] 3. The voltage and current are completely collected and applied by the same acquisition unit. In this case, it is easy to cause some functions to be lost when realizing data synchronization, such as power calculation

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