Lightning stroke interference identification method, device and system for flexible direct-current transmission line, and readable storage medium

Abstract

The invention discloses a lightning stroke interference identification method, device and system for a flexible direct-current transmission line, and a readable storage medium. The method comprises the following steps: 1, collecting voltage traveling wave data and current traveling wave data on the flexible direct-current transmission line before and after a protection starting moment; 2, constructing a line mode reverse voltage traveling wave by utilizing the voltage traveling wave data and the current traveling wave data; 3, carrying out wavelet transformation on the line mode reverse voltage traveling wave to extract a modulus maximum value under a specific scale; and 4, identifying whether lightning stroke interference occurs or not by utilizing the modulus maximum value under the specific scale. According to the method, the lightning shielding failure interference of the line can be quickly and reliably identified within the full-length range of the flexible direct-current power transmission line, the relay protection requirement of the flexible direct-current power transmission line is met, and a powerful support is provided for the practical process of traveling wave protection in a flexible direct-current power transmission system.

Description

technical field [0001] The invention belongs to the technical field of electric system relay protection and flexible direct current transmission, and in particular relates to a lightning strike interference identification method, device, system and readable storage medium of a flexible direct current transmission line. Background technique [0002] Flexible DC power grid is an effective solution to achieve smooth access, reliable transmission, optimized configuration and flexible consumption of large-scale renewable energy, and it is one of the important directions for future power grid development. However, compared with the AC system, the flexible DC grid is a "low inertia" system, the fault current rises rapidly, the fault affects a wide range, and it is very prone to "partial faults, the whole network shuts down". After a local short-circuit fault occurs on the DC line, the DC line protection system must complete the rapid suppression of the fault transient current in a ...

AI Technical Summary

Problems solved by technology

However, the lightning shielding identification algorithm for flexible DC transmission lines in the existing technology has poor quickness and low reliability, and it is difficult to meet the demand for selective and fast isolation of faulty lines in flexible DC power grids. Therefore, how to realize fast and reliable lightning shielding interference Identification is a key technical problem to be solved urgently to ensure the safe, reliable and continuous operation of the flexible DC grid

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