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Short-Term Power Fluctuations in Densely Clustered PV-Battery Systems
J. Barry, N. Munzke, J. Thomas
System Integration, Battery Storage, Very short-term power fluctuations, Spatial Correlation
PV Applications and Integration
Subtopic: Grid and Energy System Integration
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 6CO.12.2
2398 - 2403
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-6CO.12.2
0,00 EUR
Document(s): paper


Energy storage systems coupled to solar photovoltaic arrays will become a vital pillar in the future energy landscape, both on and off the grid. The high variability of solar power can be overcome with smart technologies and rapid battery response rates. Knowledge of the prevalence (how often they occur) and persistence (how long they last) of photovoltaic power fluctuations allows storage system developers to find the optimal solution to achieve the desired level of smoothness in the resulting power output from the system. In this work power data measured at 1 Hz from the densely clustered arrays of the KIT 1 MWp solar installation are analysed using statistical techniques in order to characterise the variability of single arrays as well as that of the system as a whole. The relationship between correlation and distance is examined in detail using models from the literature, for fluctuation lengths in the range of several seconds and separation distances down to 10 metres. The smoothing that results from decorrelation can be used as an additional mitigation factor in the design of small-scale collections of solar systems, especially in the context of residential and district storage solutions.