학술논문
Analysis of 0.1-Hz Var Oscillations in Solar Photovoltaic Power Plants
Document Type
Periodical
Source
IEEE Transactions on Sustainable Energy IEEE Trans. Sustain. Energy Sustainable Energy, IEEE Transactions on. 14(1):734-737 Jan, 2023
Subject
Language
ISSN
1949-3029
1949-3037
1949-3037
Abstract
Oscillations with very low frequency at 0.1 Hz, have been observed in voltage and var in practical solar photovoltaic (PV) systems when power exporting ramps up to a certain level. This letter provides an explanation on the formation of 0.1-Hz oscillations and identifies three critical factors that lead to the oscillations: communication delay between the plant-level control and the inverter-level control, high volt/var sensitivity at a high power exporting level, and the volt-var feedback system consisting of the plant control, inverter control and the grid impact. Furthermore, a critical feature of the 0.1-Hz oscillation is also explained: why oscillations appear only in voltage and var, but not in real power.