Method and device for assessment of whether magnetizing rush current causes commutation failure of HVDC or not

• Main Authors: CUI WEI, LI CHENGHAO, WANG HUA, JIAO ZAIBIN, ZHANG PENGHUI, LIU ZUNYI, LI ZONGBO, ZHAO HUA, TIAN CHUNSUN, RAO YUFEI
• Format: Patent
• Language: Chinese; English
• Published: 07.06.2019
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The present invention relates to a method and a device for fast assessment of whether a magnetizing rush current causes commutation failure of a HVDC or not. Conditions required by commutation successare provided in a condition of distortion of an inverter AC busbar voltage by starting from analyzing the influence mechanism of the harmonic wave for the commutation process; a concept of a commutation margin is defined, factor bad for commutation are calculated such as boundary values of the decreasing of a harmonic voltage and a fundamental voltage which all supplement the current research gaps for the commutation failure caused by the harmonic waves and have a certain theoretical significance. Besides, assessment indicators which can represent the fundamental voltage change and the voltage distortion are provided, a threshold value used for determination of whether the commutation failure is generated or not by employing the indicators is calculated, a method for fast determination ofclosing and space-variant