@misc{474dd656c7f947ce9284a762bb73ca9a,
title = "Impact of Aggregated PV on Subsynchronous Torsional Interaction",
abstract = "This paper investigates induced oscillation (specifically subsynchronous torsional interactions) in power systems arising from photovoltaic (PV) power modulation. Time domain simulations of a modified IEEE first-benchmark system are presented and analyzed. In the IEEE benchmark system, a PV generator was added at the same bus where the synchronous generator is connected. The impact of different parameters of the PV inverters{\textquoteright} volt-volt-ampere reactive (volt-var) curve on SSTI is examined. The most severe impact found arises from the time response of the inverter{\textquoteright}s reactive power change. A second-order time response with natural frequency matching the rotor speed deviation oscillation frequency and low-damping ratio quickly drives the system to an unstable region. Although it is highly unlikely that conditions necessary for distributed energy resource-induced oscillations would occur in the field, with knowledge of this vulnerability in mind, inverters' control parameters can be designed to avoid it.",
keywords = "DER, photovoltaics, PV, specifically subsynchronous torsional interactions, SSTI, volt-var",
author = "Rasel Mahmud and Andy Hoke and Jonathan White",
year = "2020",
language = "American English",
series = "Presented at the 47th IEEE Photovoltaic Specialist Conference (PVSC), 15 June - 21 August 2020",
publisher = "National Laboratory of the Rockies (NLR)",
address = "United States",
type = "Other",
}