Islanding detection method for user-side microgrid

• Main Authors: XU ZHIRONG, YANG PING, XU ZHIHENG, ZHENG QUNRU, YE CHAO
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ONOTHER TECHNOLOGY AREAS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORKOPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FORIMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION,DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING

The invention discloses a multi-point islanding detection method for a user-side microgrid. According to the method, a power supply directly connected to a 380V bus side is classified as class A, a power supply of a family microgrid is classified as class B, a central controller receives islanding warning signals sent by each power supply, whether an islanding warning signal is sent by the A-class power supply is judged after the islanding warning signal is received, it is indicated that a power distribution network on a floor breaks down and the whole user-side microgrid breaks down if yes, the B-class power supply where an islanding failure occurs is determined if not, and the microgrid where the power supply is located is the family microgrid where unintentional islanding occurs. By the adoption of the method, where islanding occurs in a system is judged according to the islanding type value, the type of islanding can also be judged according to the islanding type value when islanding occurs, and safe, stable and economical operation of the microgrid is guaranteed.