A da protection method for smart distribution network

Abstract

The invention relates to the field of protection of an intelligent distribution network of an electric power system, in particular to a digital-analog (DA) protection method for the intelligent distribution network in the aspects of power supply, fault processing and safety. A DA protection function is set between different power supply points and can be used for determining the corresponding fault according to fault detection information of voltage and current of a terminal of the distribution network between the power supply points and uploading the fault information to a DA controller witha DA controller function or a distribution network master station, and the key of the intelligent distribution network is fault recognition, fault positioning, fault isolation and non-fault area power supply restoration, so the protection method for the intelligent distribution network is established on the basis of the core to remove faults through the fault recognition of the automatic terminalof the distribution network; a fault point is positioned according to the uploading position of the fault information; after the fault point is positioned, switches or circuit breakers at the two ends of the fault are tripped, so a fault area is isolated; and an interconnection switch is turned on, the power supply of a non-fault area is restored, and the practical process of the fault processingof the distribution network is promoted.

Description

technical field [0001] The invention relates to the protection field of an intelligent distribution network of a power system, in particular to a DA protection method for an intelligent distribution network in terms of power supply, fault handling and safety. Background technique [0002] Distribution automation is an inevitable trend in the modernization of the power system. It is the application of modern electronic technology, communication technology, computer and network technology to securely integrate real-time information, offline information, user information, grid structure parameters, and geographic information of the distribution network to form a The complete automation and management system realizes the monitoring, protection, control and power distribution management system in the normal operation of the distribution network and in case of accidents. The significance lies in monitoring distribution network faults or abnormal operation conditions, quickly detec...

AI Technical Summary

Problems solved by technology

[0004] The intelligent distribution network protection scheme is the key point of the distribution network automation technology. In addition, the intelligent distribution network protection scheme currently popular in the market has many shortcomings. The protection scheme cannot distinguish the fault type; Processing mode, all power supply lines are processed in a unified mode; most protection schemes use communication with the master station to handle faults, and cannot automatically handle faults without the master station; some protection schemes will All switches or circuit breakers tripped, causing unnecessary impact on the line; most fault handling solutions have problems in handling multi-point faults, and cannot be scaled up, etc.

Images