Lightning strike interference identification method, device, system and medium for flexible direct current transmission lines

Abstract

The invention discloses a method, device, system and readable storage medium for identifying lightning strike interference on a flexible direct current transmission line. The method includes: step 1: collecting voltage traveling wave data on the flexible direct current transmission line before and after the protection start time and current traveling wave data; step 2: using the voltage traveling wave data and the current traveling wave data to construct a line-mode reverse voltage traveling wave; step 3: performing wavelet transform on the line-mode reverse voltage traveling wave to extract specific The maximum value of the modulus at the scale; step 4: using the maximum value of the modulus at the specific scale to identify whether lightning strike interference has occurred. The present invention uses the method to quickly and reliably identify the lightning shielding interference of the line within the entire length of the flexible direct current transmission line, meets the requirements for relay protection of the flexible direct current transmission line, and provides practicality for traveling wave protection in the flexible direct current transmission system The transformation process provides strong support.

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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