Fault protecting method of independent micro-grid

• Main Authors: HAN HANGXING, YAN YUN, XU YE, CHEN KAI, SHAO YALAI, KANG MENGJIE, YAN HAOJIE, LI JIANKE, HOU PENGFEI, XING MING, WANG JINQUAN, HUANG KEFENG, YE XIAOSONG
• Format: Patent
• Language: Chinese; English
• Published: 26.10.2016
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

A fault protecting method of an independent micro-grid is based on a short-time energy segment and can be used for accurately determining whether a fault of the micro-grid occurs. Fault current information is used for realizing fault positioning based on fault detection. The fault current and the short-time energy segment are used as fault determining criteria. Misoperation of an independent micro-grid protecting device because of outer interference and abrupt load change is prevented. The short-time energy segment (SES) is a characteristic quantity which reflects energy flow magnitude on a line and represents magnitude of the energy which flows on the line in a power frequency period T. Whether the fault of the independent micro-grid occurs is determined through comparing current effective values and short-time energy segments of an early period and a late period. The fault protecting method can be adapted with topological structure change of the micro-grid and realizes adaptive adjustment of a protecting se