Current longitudinal differential protection device and method based on GPS synchronization

Abstract

The invention discloses a current longitudinal differential protection device and method based on GPS synchronization. Each current longitudinal differential protection unit is used for being connected with three ends of a T wiring line, and each current longitudinal differential protection unit comprises a GPS module, a clock module, a communication module, a sampling module and a data processingmodule; the GPS module generates a second pulse signal; the clock module generates a time signal; the sampling module samples a local signal to form local sampling data and sends the local sampling data to the data processing module, and the data processing module marks a time label based on a time signal generated by the clock generation module; the communication module is connected with the data processing module, receives sampling data of other ends of the T wiring line, and sends local sampling data to the other ends of the T wiring line; and the data processing module realizes current longitudinal differential protection of the T wiring line. Current longitudinal differential protection can be used as main protection of a multi-terminal distribution line, line faults can be rapidly and reliably removed, and reliable and stable operation of a power distribution network is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of distribution network protection, and in particular relates to a current longitudinal differential protection device and method based on GPS synchronization. Background technique [0002] With the development of the distribution network and the increase of load density, the T-connection network frame structure of the distribution network is increasing. The traditional three-stage overcurrent protection, zero-sequence current protection and local feeder automatic protection on these T-connected distribution network lines cannot meet the requirements of quick action and selectivity of distribution network protection. [0003] The implementation of current longitudinal differential protection based on GPS synchronization can effectively solve the protection quickness and selectivity problems of T-connection lines in distribution network. The current longitudinal differential protection is based on Kirchhoff'...

AI Technical Summary

Problems solved by technology

Difficulties in the realization of multi-terminal current differential protection, one is the communication problem of data interaction at each end

The second is the problem of synchronous sampling of the current at each terminal. The algorithm of current differential protection requires that the currents of each terminal participating in the comparison must be sampled synchronously or processed synchronously, which is the key to realizing differential protection.

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