Relay protection method for accessing micro-grid to power grid

• Main Authors: ZHAO TIANYI, SHAN BAOTAO, WANG JING, TAO CHENBIN, LI ZHENWEI, ZHAO SHUJUN
• Format: Patent
• Language: Chinese; English
• Published: 24.12.2021
• 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 invention discloses a relay protection method for accessing a micro-grid to a power grid. The relay protection method comprises a power distribution network relay protection method based on regional differential motion and a low-voltage power distribution network relay protection configuration method based on positive and negative impedance relays. According to the method, the requirement of micro-grid access on the primary equipment of the power distribution network is proposed, the functions of fault identification, positioning, fault isolation and protection of the power distribution network are realized, and meanwhile, the micro-grid system is matched to identify the island operation mode of the micro-grid and carry out related processing measures; and the objective of the invention is to ensure the reliability and effectiveness of microcomputer protection of the distributed power supply under multiple power supplies, multiple power supply types, complex power supply modes and operation modes. The pro