SINGLE-ENDED ELECTRICAL QUANTITY-BASED FAST FULL-CIRCUIT PROTECTION METHOD USING CHOKE TO CONSTRUCT CIRCUIT BOUNDARY

摘要

Disclosed is a single-ended electrical quantity-based fast full-circuit protection method using a choke to construct a circuit boundary. In the method, a circuit boundary is constructed by installing a choke on a circuit according to topology types of various power supply systems, and then protection determination data is constructed from differences in electrical quantity differences of a circuit region under protection or during an internal or an external failure, thereby realizing fast full-circuit protection based on single-ended electrical quantities. The present invention adopts a choke to construct a boundary of a circuit, and then achieves single-ended quantity-based fast full-circuit protection for a circuit having no boundary elements. The method of the present invention effectively overcomes the problem of poor protection sensitivity of operational frequency quantities in an alternating current circuit containing multiple inverters, and also meets a requirement of fast protection operations for direct current circuits. The invention does not require additional protection when applied to a power distribution network, so as to achieve fast determination of an internal or external failure of a protection region simply by using single-ended electrical quantities, thereby effectively solving the relay protection problem of a power grid containing multiple inverters.