MICROGRID ADAPTIVE OVERCURRENT PROTECTION METHOD

• Main Authors: CHEN, JINXIANG, TANG, ZHIJUN, LIN, SHAOZHEN, ZHU, WEIJUN, DENG, CHAOPING, LIN, GUODONG
• Format: Patent
• Language: Chinese; English; French
• Published: 03.12.2015
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS,e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USERAPPLICATIONS; 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; INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ONOTHER TECHNOLOGY AREAS; 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; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

A microgrid adaptive overcurrent protection method, comprising the following steps: 1. configuring a central protection unit in a microgrid structure, and configuring a local protection unit at each breaker, communication being conducted through optical fibers between local protection units and between the local protection units and the central protection unit; 2. configuring adaptive current protection at each local protection unit; 3. the central protection unit acquires in real time system operation information uploaded by the local protection units, and determines microgrid operation mode, a fault type and a fault point location; 4. in grid-connected operation mode, the local protection units conduct real-time sampling on the voltage of a bus and the current of a feeder line, and determine system impedance according to the sampling value; and in an islanding operation mode, the local protection units calculate the setting value for current quick-break according to the fault type; 5. the central protection