Method and device of inhibiting influence of compensator on line distance protection

Abstract

The embodiment of the present invention discloses a method of inhibiting the influence of a compensator on the line distance protection. The method comprises the steps of obtaining a first current of a line that the compensator accesses or a series-wound transverter in the compensator, and a first voltage of a bus or the line that the compensator accesses; when the first current is greater than a preset current threshold value, and the time of duration is greater than a first preset time threshold value, quitting the series-wound transverter and a series-wound transformer; when the first voltage is less than or equal to a preset voltage threshold value, and the time of duration is greater than a second preset time threshold value, setting an output voltage of the series-wound transverter as zero, obtaining a second current of an element corresponding to the first current, satisfying the conditions that the first current needs to satisfy, and quitting the series-wound transverter and a series-wound transformer; otherwise canceling the operation of setting the output voltage of the series-wound transverter as zero, and obtaining the first current when a second voltage of a line corresponding to the first voltage is greater than a preset voltage threshold value, and the time of duration is greater than a third preset time threshold value. The embodiment of the present invention discloses a device of inhibiting the influence of the compensator on the line distance protection.

Description

technical field [0001] The invention relates to a technology for suppressing the influence of power electronic equipment on distance protection lines in the field of power systems, in particular to a method and device for suppressing the influence of compensators on distance protection of lines. Background technique [0002] With the rapid development of the interconnection technology of the power system, the power system for long-distance transmission has been widely used. During the operation of a long-distance power system, it is easily affected by factors such as the environment and load demand, and system oscillations occur, resulting in problems such as system stability control performance, AC-DC hybrid grid coordination, and power flow control capabilities. 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 (Interl...

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Problems solved by technology

[0005] In order to solve the above technical problems, the embodiment of the present invention expects to provide a method and device for suppressing the influence of the compensator on the line distance protection, which solves the problem of the existing technology that has an impact on the protection performance 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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