A New Interval Layer Networking Method for Metro Medium Voltage Ring Network Protection System

Abstract

The invention discloses a novel interval layer net networking method for a subway pressing ring net protecting system. The method comprises the steps that in a numerical protecting system of a pressing ring net in a subway power supply system, protecting devices in transformer stations and between the transformer stations are communicated through an interval layer GOOSE network, the information of protecting starting, the information of protecting actions and the information of protecting switch positions are exchanged mutually, the situations of the protecting actions of a higher-grade switch and a lower-grade switch are monitored, and then the quick positioning and the quick resecting of ring net buses and cable faults are logically judged. In the method, a VLAN overlap mode is used, each transformer station is distributed with the only VLAN ID, and at the same time, the transformer station can realize communication with the adjacent transformer stations in front and behind, so that a GOOSE message is transmitted in a directional and limited area in the network, the transmission range of broadcast packets can be effectively limited, the efficiency of the network is improved, and the system stability and the safety are improved.

Description

technical field [0001] This program involves the field of digital protection of the power supply system of the subway industry. The solution optimizes the network configuration of the bay layer to improve network efficiency, and the protection devices exchange protection start, action and switch position information through the bay layer GOOSE network to realize rapid location and removal of ring network busbar and cable faults. Background technique [0002] In recent years, most domestic urban rail transit power medium-voltage ring networks have adopted the configuration scheme of "line optical fiber differential protection + overcurrent protection". The overcurrent protection is used as the backup protection for the short-circuit fault of the ring network cable and the main protection for the short-circuit of the medium-voltage busbar in the substation. The action time limit of overcurrent protection is coordinated step by step. For the power supply mode of the large ring...

AI Technical Summary

Problems solved by technology

If reasonable multicast packet filtering is not performed, all multicast packets sent by protection devices on the network will be received, which will seriously affect the communication and data processing capabilities of protection devices

When the power system fails, multiple protection devices will send a large number of GOOSE messages with short intervals at the same time, which may cause network overload, communication delay, protection device network card receiving buffer overflow and loss of messages, resulting in the action time of the protection device becomes longer, or does not move reliably

Images