A communication interruption detection method suitable for digital protection of medium voltage power supply system of subway

Abstract

The invention discloses a digital protection communication interruption detection method which is applicable to digital protection communication interruption detection for a substation in a metro medium-voltage power supply system. In a combined way of ordinary detection and novel real-time detection, by the digital protection communication interruption detection method, GOOSE (Generic object oriented substation event) communication interruption state can be quickly diagnosed, a communication overcurrent protection function can be rightly locked in real time, and a GOOSE network load can be effectively reduced; the digital protection communication interruption detection method is a simple, rapid and high-applicability GOOSE communication interruption detection scheme.

Description

technical field [0001] The invention relates to the field of digital protection for medium-voltage power supply systems of subways. The invention provides a novel substation GOOSE data communication interruption detection method, which can quickly diagnose the GOOSE communication interruption state, and correctly block the communication overcurrent protection function in real time. Background technique [0002] The substation of the subway medium-voltage power supply system generally sets the optical fiber current differential as the main protection, and sets the over-current protection as the backup protection. In the case of large partition power supply, the conventional backup overcurrent protection cannot well meet the protection's requirements for selectivity and quick action. Therefore, adding communication current protection function to the backup current protection is a better solution to this problem. solution. The communication current protection uses the IEC6185...

AI Technical Summary

Problems solved by technology

If the network card overflows, it will cause large-scale packet loss in the entire network for a long time, resulting in the interruption of communication in the entire system, which is very harmful.

The processing capability of the CPU also directly affects the processing capability of GOOSE packets, greatly affecting the probability of GOOSE packet loss

Then if the system adopts the conventional detection method for GOOSE communication and shortens the T 0 (Usually 5s or more) and the interval between resending messages will occupy bandwidth, affect the processing power of the CPU, and cause harm to system communication

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