Implementation of advanced inverter interoperability and functionality

The high penetration of utility-interconnected Photovoltaic (PV) systems requires nontraditional and seemingly noncompliant modes of operation as a method to accommodate the high level of distributed generation at the distribution level. The normal operation of utility-interconnected PV systems is governed by IEEE 1547 Standard for Interconnecting Distributed Resources with Electric Power Systems and provides relevant requirements for performance, modes of operation, safety, and maintenance considerations. A recommended practice that provides flexibility of the existing interconnection standard by expanding the implementation requirements for utility interconnection is currently being addressed in IEEE 1547.8. The proposed recommended practice establishes methods and procedures for the expanded use of the governing utility-interconnected standard and is intended to address the increasing implementation of a varying resource. This recommended practice is designed for the implementation of advanced smart-grid functionality and allows the continued operation of Distributed Energy Resources (DER) during abnormal voltage and frequency conditions. The distributed resource smart-grid functionality is described in IEC61850-7-420, Advanced Functions for DER Inverters Modeled in IEC 61850-90-7. This report describes the implementation of advanced functionality and successful criteria to assess proper operations of the “smart inverter” under communication driven control.