INTERCONNECTION SWITCHING SYSTEM AND METHOD FOR CONNECTING A DISTRIBUTED ENERGY RESOURCE TO AN ELECTRICAL POWER SYSTEM

摘要

A distributed energy resource (DER) switching system and method for connecting a DER to an electrical power system (EPS) protector, wherein the DER has a reactance-to-resistance ratio higher than the reactance-to-resistance ratio of the EPS protector. The DER switching system includes an input for receiving power from the DER, and an output for providing power from the DER to the EPS protector. The DER switching system is designed to effectively lower the higher reactance-to- resistance ratio of the DER during an over-current fault so that, during the fault, the effective reactance-to-resistance ratio at the output of the DER switching system is lower than the reactance- to-resistance ratio of the EPS protector. The method includes effectively lowering the reactance-to- resistance ratio of the DER by varying the operating state of a switching device in a controlled manner during the fault.