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Method and system for checking transient overvoltage after extra-high voltage direct current fault

A transient overvoltage, UHV DC technology, used in the measurement of current/voltage, AC network voltage adjustment, measurement of electrical variables, etc.

Inactive Publication Date: 2019-12-20
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a transient overvoltage checking method and system after a UHV DC fault to solve how to check the transient overvoltage of the AC / DC hybrid power grid after the DC disturbance, so as to determine the The Problem of the Maximum DC Transmission Power in Interconnected Grid

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  • Method and system for checking transient overvoltage after extra-high voltage direct current fault

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[0039] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0040] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that the terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or ...

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Abstract

The invention discloses a method and a system for checking transient overvoltage after an ultra-high voltage direct current fault. The method comprises the following steps: determining an upper limitvalue of the transient voltage rise of the bus of a converter station after a direct current fault of an alternating current-direct current hybrid power grid; respectively acquiring the initial voltage of the bus of the converter station before the direct current fault of the alternating current-direct current hybrid power grid and the maximum transient voltage in the period of the direct currentfault under a current direct-current power level; calculating a difference value between the maximum transient voltage and the initial voltage as a current bus voltage rise value of the converter station, and comparing the current bus voltage rise value with the upper limit value of the transient voltage rise to obtain a check result; and when the check result indicates that the current bus voltage rise value of the converter station is equal to the upper limit value of the transient voltage rise, taking the current direct-current power as the maximum direct-current transmission power of the alternating current-direct current hybrid power grid under the restriction of the transient voltage rise.

Description

technical field [0001] The present invention relates to the field of safe and stable operation of an AC / DC hybrid power grid, and more specifically, relates to a transient overvoltage checking method and system after a UHV DC fault. Background technique [0002] With the large-scale development of UHV DC, the power impact caused by DC faults has become a key factor affecting the safe and stable operation of power systems. With the continuous increase of UHVDC power, the transient overvoltage problem of the sending-end power grid after UHVDC disturbance has become increasingly prominent, which seriously restricts the transmission capacity of UHVDC. [0003] The transient overvoltage caused by DC disturbance is mainly caused by the temporary loss of active power and the delayed cut-off of the filter. DC blocking, commutation failure, restart and AC short-circuit faults all cause temporary unbalance of reactive power, but the duration is different. The delay cutting time of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16G01R19/165
CPCG01R19/16538G01R19/16576H02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 徐式蕴于钊王超刘明松邱威黄东敏卓谷颖谭真程势高毕经天
Owner STATE GRID CORP OF CHINA