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Secondary commutation failure determination method and system

A technology of commutation failure and discrimination method, applied in the field of power grid, can solve the problem of inability to judge secondary commutation failure, etc., and achieve the effect of improving effect and high precision

Active Publication Date: 2018-12-07
TSINGHUA UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the two existing commutation failure judgments, it is impossible to judge the secondary commutation failure

Method used

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  • Secondary commutation failure determination method and system
  • Secondary commutation failure determination method and system
  • Secondary commutation failure determination method and system

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The object of the present invention is to provide a method and system for judging secondary commutation failure, so as to distinguish the type of commutation failure as secondary commutation failure, thereby improving the effect of preventing commutation failure.

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction ...

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Abstract

The invention discloses a secondary commutation failure determination method and system; the method comprises the following steps: using an equivalent fault method to obtain an extinction angle of each inversion station after the fault occurs; determining the minimum extinction angle according to the extinction angle of each inversion station, the inversion station with the minimum extinction angle, and a commutation bus on which the inversion station with the minimum extinction angle is located; determining whether the minimum extinction angle is smaller than or equal to a critical extinctionangle or not; if yes, determining the inversion station with the minimum extinction angle has a commutation failure, and obtaining the voltage of the commutation bus on which the inversion station with the minimum extinction angle is located; determining whether the voltage of the commutation bus on which the inversion station with the minimum extinction angle is located is smaller than or equalto a commutation bus voltage critical value or not; if not, determining the commutation failure type of the inversion station with the minimum extinction angle is the secondary commutation failure. The method and system can determine the commutation failure type as the secondary commutation failure, thus improving the commutation failure prevention effect.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method and system for identifying secondary commutation failures. Background technique [0002] In the Multi-Infeed High-Voltage Direct Current (MI-HVDC) system, the inverter station may suffer from two voltage disturbances after the AC system fault occurs: (1) the voltage caused by the AC system fault itself Disturbance, defined as a voltage disturbance; (2) If a commutation failure occurs in an inverter station, it will cause the voltage of the commutation bus of the inverter station and other adjacent inverter stations to drop further. A further drop in voltage is a secondary voltage disturbance. Corresponding to the two voltage disturbances, there may be two commutation failure situations: (1) One voltage disturbance is enough to cause commutation failure in the inverter station, and the commutation failure in the inverter station is defined as primary commutation fail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 沈沉郑宽陈颖黄少伟于智同张璐包海龙
Owner TSINGHUA UNIV
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