Traveling wave protection fixed value setting method for high-voltage direct-current transmission line

Abstract

The invention relates to a traveling wave protection fixed value setting method for a high-voltage direct-current transmission line. The method comprises the following steps that (1) a travelling wave protection function and an operation criterion mode are defined, and a polar wave fixed value and a floor mold wave fixed value are determined according to the operation criterion mode; (2) factors influencing the traveling wave fixed value are analyzed, and various simulation experiment conditions are set; (3) a simulation model is set up, simulation is carried out under two work conditions, all direct-current protection is closed in the simulation process, and polar wave data and floor mold wave data are extracted; (4) the polar wave data are processed, and the key failure information amount is extracted; (5) the polar wave fixed values under the two work conditions are calculated; (6) the minimum value of the floor mold wave variable quantity is extracted from the obtained floor mold wave data, and the floor mold wave fixed value is set by combining actual engineering parameters; (7) the obtained polar valve fixed values and floor mold wave fixed value are substituted into the simulation model, and rationality is verified. The formulating scheme of the simulation experiment conditions is analyzed in detail, the method is high in reliability and close degree to actual engineering, and therefore the method can be widely applied to high-voltage direct-current transmission traveling wave protection fixed value setting.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a method for setting a fixed value of traveling wave protection of a high-voltage direct current transmission line based on fault information. Background technique [0002] High-voltage direct current transmission (HVDC) plays an increasingly important role in long-distance and high-power transmission due to its advantages of large transmission power, low line cost, and good control performance. However, due to the long length of DC transmission lines, crossing various complex terrains, and being subjected to variable weather conditions, the most common faults in HVDC transmission systems are line faults. [0003] Traveling wave protection is one of the main line protections of existing HVDC transmission projects. Among them, the traveling wave protection with polar wave and ground mode wave as the action criterion can fully utilize the voltage and current...

AI Technical Summary

Problems solved by technology

Misoperation and refusal to operate are often prone to occur during project operation

[0005] To sum up, there is no clear and definite setting method for the setting value setting of traveling wave protection of DC transmission, and the reliable operation of protection largely depends on the rationality of the setting value of traveling wave protection. Carry out in-depth research on fixed value setting

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