Power distribution network differential protection system and protection method based on 5G communication network

Abstract

The invention discloses a power distribution network differential protection system based on a 5G communication network. The power distribution network differential protection system comprises the following modules: a measurement module, a communication module, a logic judgment module and an execution output module, the measurement module measures the electrical quantity of the protected circuit; the communication module is used for transmitting the measured electric quantity to the opposite end of the protection line for data exchange; the logic judgment module judges whether the protected circuit breaks down or not according to the obtained electrical quantity; and the execution module acts on the protection device according to the judgment result obtained by the logic judgment module. The method comprises the following steps: measuring electrical quantities at two ends of a protected line, transmitting the measured electrical quantities to an opposite end through a communication channel, judging whether the protected line has a fault or not, if so, enabling a protection device to act, and if not, enabling the protection device not to act. According to the invention, the 5G communication transceiver module is adopted, so that the real-time performance of information acquisition of the electrical equipment is higher, timely and effective action of relay protection is really realized, and the protection effect of the electrical equipment when a power grid fails is greatly improved.

Description

Technical field: [0001] The invention relates to the fields of power grid fault protection technology and electric power communication technology, in particular to a distribution network differential protection system and protection method based on a 5G communication network. Background technique: [0002] The distribution network is an indispensable infrastructure in the development of society, and it plays a connecting role in the production of the power grid. With the increasingly complex structure of the distribution network, the requirements for the time and protection action of the protection action are also getting higher and higher. The three-stage overcurrent protection used in the distribution network now faces problems such as the inability to take into account the rapidity and selectivity requirements, and the difficulty in setting the value. Current differential protection has the advantages of accurate positioning, high sensitivity, and no need for voltage inf...

AI Technical Summary

Problems solved by technology

[0003] Traditional current differential protection based on optical fiber channel requires optical fiber private network communication. However, it is difficult to lay optical fiber, the construction period is long, the cost is high, and the later operation and maintenance are difficult, and many places do not have the conditions for laying optical fiber. Therefore, in the distribution network The application in has not been widely promoted

The previous generation of mobile communication 4G has too high delay and poor network reliability, which cannot meet the requirements of differential protection, and the coupling of 4G network is too strong to achieve logical separation of different services

The 5G communication technology has the characteristics of high speed, high capacity, high reliability, low delay and low energy consumption. Its use brings a new path to solve the interaction of distribution network protection information, without adding new protection equipment configuration and communication optical cable. , fundamentally solve the problem of poor selectivity and low reliability of distribution network protection

Images