Distributed type grid-connecting system monitoring system and its anti-island protection method

Abstract

The invention relates to a distributed type grid-connecting system monitoring system, comprising a distributed type generation and grid-connecting interface device for monitoring the distributed type generation system and the load, uploading the monitoring information to a power dispatching agency and executing the remote commands from the power dispatching agency; a monitoring terminal for detecting the distributed type power supply grid-connecting points, the voltage, current and power values at the load points as well as the state of the grid-connecting switch and receiving the remote communication data of the distributed type power supply grid-connecting controller; and a power dispatching agency for realizing the operation state monitoring and control of the interfaced distribution type power supply distribution grids and realizing the energy management operation of the distributed type power supply according to its entrusted task scope. The invention further discloses an anti-island protection method for the distributed type generation and grid-connecting system monitoring system. According to the invention, without the introduction of a specially erected communication network, the cost for the system can be reduced. Under the premise that new distributed type power supply is added into the system, the monitoring system does not need more investment for its hardware. This meets the requirement for flexible interfacing of the distributed type power supply.

Description

technical field [0001] The invention relates to the technical field of a distributed power generation grid-connected system based on carrier communication, in particular to a monitoring system of a distributed power generation grid-connected system and an island protection method thereof. Background technique [0002] Affected by the national new energy policy, the penetration rate of distributed power represented by distributed photovoltaics on the traditional power consumption side continues to increase. Due to the small installation capacity of the distributed power supply unit and the randomness of the installation location, it is not economical and flexible to use a dedicated optical fiber to monitor the distributed power supply. At present, the existing solutions implemented in the form of cloud platform can complete the monitoring function of distributed power supply electrical quantity. However, the control of distributed power sources through the cloud platform c...

AI Technical Summary

Problems solved by technology

However, the control of distributed power sources through the cloud platform cannot meet the requirements for real-time and security in power operation control.

Distributed power sources are equipped with island protection, but when the penetration rate of distributed power sources in the region continues to increase, island protection based on distributed power sources will not be able to give full play to the advantages of distributed power capacity and reduce the cost of installing distributed power sources for distribution networks. The economy brought about, and the reliability and safety of the distribution network power supply cannot be improved

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