Auxiliary device for topology identification of low-voltage transformer area and topology identification method

Abstract

The invention relates to an auxiliary device for topology identification of a low-voltage transformer area and a topology identification method, and the auxiliary device comprises a magnetic coupling isolation driving module which is used for generating a pulse driving signal according to a control signal transmitted by a control unit, and outputting the pulse driving signal to a characteristic signal switching module; the characteristic signal switching module is used for generating a characteristic current signal and switching the characteristic current signal to an alternating current power grid; the voltage zero-crossing detection module is used for detecting the position of a voltage zero-crossing point of the alternating-current power grid; the communication module is used for performing data interaction with an upper terminal; the alternating current sampling module is used for sampling a current signal in an alternating current power grid and inputting the current signal to the control unit; the control unit is used for sending a control signal to the magnetic coupling isolation driving module according to an instruction sent by an upper terminal and the voltage zero crossing point position; and whether a characteristic current signal exists in the alternating current power grid is identified, and an identification result is uploaded to an upper terminal.

Description

technical field [0001] The invention relates to an auxiliary device and a topology identification method for topology identification of a low-voltage station area, and belongs to the technical field of low-voltage distribution network automation. Background technique [0002] The low-voltage station area is a key link connecting the power transmission and distribution network and users. Due to the large number of system levels, the number of branches, and the complex user load wiring, the topology structure is complex and changeable, and full-scale monitoring cannot be realized. Accurate topology information of the station area is helpful for the power grid to calculate the loss of each line, locate the short-circuit fault of the low-voltage distribution network, and manage the three-phase imbalance. [0003] The traditional topology identification methods include relying on the station area topology identification instrument for identification, and using manual inspection e...

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Problems solved by technology

[0005] However, the above-mentioned scheme does not disclose the specific circuit design of the characteristic current, that is, the chopper generator, which leads to the fact that the scheme has no theory but cannot be tested in practice, and the chopper detection and recognition algorithm is difficult to implement, and the accuracy of topology recognition is limited.

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