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Control method and control device for eliminating influence of series compensator on line protection

A series compensation and control method technology, applied in reactive power adjustment/elimination/compensation, circuit devices, reactive power compensation and other directions, can solve the problems of insignificant reduction of line voltage and inability to eliminate the protection effect of series compensator, etc. Achieve the effect of ensuring accuracy, eliminating influence, and good engineering applicability

Pending Publication Date: 2022-05-27
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0006] The application number is CN107026432BCN and the name of the invention is a method and device for suppressing the influence of compensators on line distance protection. A method of reducing voltage output based on the bus voltage corresponding to the series compensator connected to the line is proposed. The influence of the compensator on the distance current protection of the line, but when the single-phase high-impedance grounding occurs on the line, the line voltage does not drop significantly, the output of the compensator does not change, and it cannot eliminate the effect of the series compensator on the line protection

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  • Control method and control device for eliminating influence of series compensator on line protection
  • Control method and control device for eliminating influence of series compensator on line protection
  • Control method and control device for eliminating influence of series compensator on line protection

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[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of this application.

[0031] It should be understood that the terms "first", "second" and the like in the claims, description and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "comprising" as used in the specification and claims of this application indicate the presence of the described feature, integer, step, operation, element and / or component, but do not exclude one or more other ...

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Abstract

The invention provides a control method and a control device for eliminating the influence of a series compensator on line protection. The series compensator is connected in series in a line of an alternating-current power grid and used for controlling the current of the line, the series compensator comprises a current converter, and the control method comprises the following steps: after the current Iv of the current converter is detected to be greater than an action constant value IvLim of rapid overcurrent protection and the duration time exceeds rapid overcurrent protection time TIv, the current converter is connected with the current converter; controlling the series compensator to perform rapid overcurrent protection action, and quitting the series compensator; after the zero-sequence current Iv0 of the converter is detected to be greater than a zero-sequence current limit value Iv0Lim and the zero-sequence current lasts for a delay time TIv0, quitting the series compensator; and after the zero-sequence current Iv0 of the converter is detected to be smaller than the zero-sequence current recovery value Iv0Lim2 and the zero-sequence current recovery time TIv02 lasts, normal operation of the series compensator is recovered.

Description

technical field [0001] The present application relates to the technical field of flexible power transmission in power systems, in particular to a control method and a control device for eliminating the influence of a series compensator on line 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 (Interline Power Flow Controller, IPFC), convertibl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1807Y02E40/30
Inventor 马秀达董云龙潘磊林艺哲
Owner NR ELECTRIC CO LTD
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