Reverse power protection power distribution network system with distributed power source

Abstract

The invention discloses a reverse power protection power distribution network system with a distributed power source. The reverse power protection power distribution network system with the distributed power source comprises a distributed power source branch circuit, wherein the distributed power source branch circuit is provided with a circuit breaker which cuts off the distributed power source, a reverse power detection device is arranged on the distributed power source branch circuit, the reverse power detection device detects whether a reverse electric current flows to a power distribution network through the distributed power source or not when the power distribution network is powered off, and when the reverse electric current flows to the power distribution network through the distributed power source, the reverse power detection device sends a circuit breaker execution signal to the circuit breaker on the distributed power source branch circuit, the circuit breaker is opened under control of the circuit breaker execution signal, and then the distributed power source is cut off and can not transmit reverse power to the power distribution network. Accordingly, the reverse power protection power distribution network system with the distributed power source improves a personal safety protection level of a maintainer, and can be used in occasions of phase advance protection of an electric generator and the like.

Description

technical field [0001] The invention relates to a distributed power distribution network system with reverse power protection and belongs to the technical field of distributed power grid-connected protection. Background technique [0002] In recent years, the reduction of non-renewable resources, the rise of energy demand, and the enhancement of environmental awareness have spawned a large number of distributed power sources and microgrids. Distributed power supply refers to a power supply that is located near the load, has a small installed capacity, and is connected to the medium and low voltage distribution network nearby. Distributed energy can not only be used as a backup power source when there is a power shortage, but also can meet the power demand of areas that cannot be covered by centralized power generation or urban regional power grids. It is for these reasons that distributed energy is always indispensable in the development of my country's power system. missing...

AI Technical Summary

Problems solved by technology

However, after the distributed power supply is integrated into the grid, since the power generation time of the distributed power supply is uncertain (especially for 380V grid-connected projects, which do not participate in the unified dispatch of the power grid and are started and stopped by customers themselves), the start and stop time of the distributed power supply is largely Affected by weather factors, even if there are obvious disconnection points on both sides of the line, the distributed power source on the line may still be sending power to the line, and it is still unsafe for maintenance personnel to work

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