A method and device for eliminating the influence of compensator on line distance protection

Abstract

The embodiment of the invention discloses a method for eliminating influence of a compensator on line distance protection. The method comprises the steps of obtaining a current of a series converter in the compensator or a line accessed by the compensator, and when the current is greater than a preset current threshold value and first duration time is greater than a first preset time threshold value, carrying out logout by the serial converter or a series transformer; or when the current does not satisfies the above-mentioned demand, obtaining a voltage of a busbar accessed by the compensator or the line accessed by the compensator, and when the voltage is smaller than or equal to a preset voltage threshold value and second duration time is greater than a second preset time threshold value, carrying out logout by the series converter and the series transformer. The embodiment of the invention also discloses a device for eliminating the influence of the compensator on the line distance protection.

Description

technical field [0001] The invention relates to a technology for eliminating the influence of power electronic equipment on distance protection lines in the field of power systems, and in particular to a method and device for eliminating the influence of a compensator on line distance protection. Background technique [0002] With the rapid development of the interconnection technology of the power system, the power system of long-distance transmission has been widely used. In the process of long-distance power system operation, it is easily affected by factors such as environment and load demand, and system oscillation occurs, which leads to problems such as system stability control performance, AC / DC hybrid grid coordination, and power flow control capability. In the prior art, static synchronous series compensator (Static Synchronous Series Compensator, SSSC), unified power flow controller (Unified Power Flow Controller, UPFC) and interline power flow controller (Interlin...

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the embodiment of the present invention expects to provide a method and device for eliminating the influence of the compensator on the line distance protection, which solves the problem that the prior art has an impact on the protection function of the line protection equipment, and ensures that the line protection equipment is The performance of the distance protection of the line ensures the safe and stable operation of the power system and the engineering practicability

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