Impact of Distribution Generation Penetration on Power System Dynamics considering Voltage Ride-Through Requirements

The recent increase in the penetration of Distribution Generators (DGs) has resulted in the imposition of requirements for voltage and frequency ride-through capabilities for small generators by the Federal Energy Regulatory Commission (FERC). The IEEE standard 1547 provides a guideline for the interconnection of the DGs with electric power systems and associated interfaces. Another important consideration is the North American Electric Reliability Corporation (NERC) standard, TPL-001-4 which calls for transmission system planners to adopt a criteria for system voltage limits including transients. In this paper, post fault dynamics due to effect of the variation of DG levels and single-phase air-conditioning induction motor load composition is examined on a New England 39-bus system and violating buses are identified in view of the TPL-001-WECC-CRT-3.1 criteria and the DG voltage-ride through recommendations. The studies conducted indicate that increasing DG levels can cause more voltage violations.