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

Abstract

The embodiment of the invention provides a method for reducing the influence of a compensator on power line distance protection. The method comprises the steps of acquiring a first current of a circuit connected with a compensator or a series converter in the compensator, and a first voltage of a bus connected with the compensator or a circuit connected with the compensator; when the first current is larger than a preset current threshold value and the duration time is larger than a first preset time threshold value, exiting the series converter and a series transformer; when the first voltage is smaller than or equal to a preset voltage threshold value and the duration time is larger than a second preset time threshold value, setting the voltage of the series converter to be a first preset voltage; when the second current of a element of the first current meets a condition that the first current meets, exiting the series converter and the series transformer; when a second voltage of a line corresponding to the first voltage is larger than the preset voltage threshold value and a fourth time duration is larger than a third preset time threshold value, cancelling the voltage of the series converter to be the first preset voltage and obtaining the first current. The embodiment of the invention discloses a device for reducing the influence of the compensator on power line distance protection.

Description

technical field [0001] The invention relates to a technology for reducing the influence of power electronic equipment on distance protection lines in the field of power systems, in particular to a method and device for reducing the influence of compensators on line distance protection. 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 (InterlinePower F...

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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 reducing the influence of the compensator on the line distance protection, which solves the problem of the prior art 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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