Differential protection method and system suitable for DC power distribution network line

• Main Authors: WANG XIAOHONG, WANG CHENQING, HONG FENG, ZHENG XIAOJIANG, WU TONGHUA, ZHENG KUNCHENG, DAI WEI, THE OTHER DESIGNERS HAS WAIVED THE RIGHT TO BE CITED, JIANG YUAN, HU ZILONG, YAO GANG, ZHENG YUPING, LI XINDONG, SU WEI, CHEN GUOZHOU, HOU XIAOFAN, TENG XIANLIANG
• Format: Patent
• Language: Chinese; English
• Published: 03.07.2020
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses a differential protection method and system suitable for a DC power distribution network line, and the method comprises the steps: collecting the instantaneous current values of a local side differential protection device and an opposite side differential protection device of the DC power distribution network line, and calculating the current variation of differential protection at the same side of the DC power distribution network line; determining current variation differential current according to the current variation of the differential protection on the two sides;and matching the adaptive differential protection action characteristics according to the current variation differential current so as to carry out differential protection action signal output control. According to the invention, differential protection action control is carried out through the current variable quantity, reliable and rapid action can be carried out on a single-pole grounding fault with unobvious fault cu