DC power transmission system commutation failure suppression method and system
A DC transmission system, commutation failure technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve the problem of high commutation failure rate, reduce fault current, The effect of prolonging the service life
Active Publication Date: 2017-05-24
CHINA ELECTRIC POWER RES INST +3
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[0005] The present invention provides a method and system for suppressing commutation failure of DC power transmission system to solve the problem of high commutation failure rate of DC power transmission system
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[0029] 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.
[0030] 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 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 over...
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The invention discloses a DC power transmission system commutation failure suppression method. The method comprises the following steps: connecting a resistor and a capacitor to form a series branch, and connecting a current-limiting inductor, the series branch and a switch in parallel to form a parallel circuit; establishing three groups of parallel circuits, which are connected with three phases of an AC side of a converter transformer respectively; carrying out short circuit current detection on the AC side of the converter transformer; when the AC side of the converter transformer has no short circuit current, controlling the switch to close to enable the switch to be communicated with the AC side of the converter transformer, the current-limiting inductor and the series branch to be disconnected with the AC side of the converter transformer, and the three groups of parallel circuits to realize zero-impedance current transmission; or when the AC side of the converter transformer has short circuit current, controlling the switch to open to enable the current-limiting inductor and the series branch to be connected with the AC side of the converter transformer, thereby reducing fault current of a fault phase and a normal phase in the three phases of the converter transformer.
Description
technical field [0001] The present invention relates to the field of high-voltage direct current transmission in power systems, and more specifically, to a method and system for suppressing commutation failures in direct current transmission systems. Background technique [0002] High-voltage direct current transmission (HVDC) is widely used in large-scale grid interconnection, long-distance large-capacity power transmission, and cross-strait power transmission due to the advantages of transmission distance not limited by synchronous operation stability, large transmission capacity, low line cost, and rapid and flexible power regulation. be widely used. Commutation failure is one of the most common faults in HVDC systems. In a converter, a valve exiting conduction fails to recover its blocking capability during a period of reverse voltage action, or during the commutation process during reverse voltage If the process is not completed, when the valve voltage becomes positive...
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Login to View More IPC IPC(8): H02H9/02H02H9/04
CPCH02H9/02H02H9/045
Inventor 李金忠高飞王琳徐征宇顾悦张书琦李江涛赵晓宇任子媛赵志刚郑敏军孙建涛曹辉汪可赵政贾鹏飞刘宇豪遇心如孙义何家欣
Owner CHINA ELECTRIC POWER RES INST