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

Abstract

The embodiment of the present invention discloses a method for suppressing the influence of the compensator on line distance protection, including: obtaining the first current of the line connected to the compensator or the first current of the series converter in the compensator, the bus bar connected to the compensator or the compensator The first voltage of the connected line; the first current is greater than the preset current threshold and the duration is greater than the first preset time threshold; exit the series converter and the series transformer; the first voltage is less than or equal to the preset voltage threshold and the duration is greater than When the second preset time threshold is set, the output voltage of the series converter is set to zero and the second current of the first current corresponding element satisfies the conditions required by the first current, and the series converter and the series transformer are exited; otherwise, the first voltage corresponds to The second voltage of the line is greater than the preset voltage threshold and lasts longer than the third preset time threshold, canceling setting the output voltage of the series converter to zero and obtaining the first current. The embodiment of the invention discloses a device for suppressing the influence of a compensator on 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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