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Title:
 
Estimating Overall MPP Tracking Losses Using Weather Statistics
 
Author(s):
 
M. Egler, S. Gordon
 
Keywords:
 
Energy Yield, MPPT Performance, Energy Meteorology
 
Topic:
 
OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Subtopic: Operation of PV Systems and Plants
Event: 31st European Photovoltaic Solar Energy Conference and Exhibition
Session: 5BV.1.28
 
Pages:
 
2105 - 2109
ISBN: 3-936338-39-6
Paper DOI: 10.4229/EUPVSEC20152015-5BV.1.28
 
Price:
 
 
0,00 EUR
 
Document(s): paper
 

Abstract/Summary:


In energy yield studies for PV systems, MPP tracking losses are often neglected. EN 50530:2010 introduced a methodology for the measurement of static and dynamic MPPT efficiencies. Typically, the influence of the MPP tracker under static environmental conditions is accounted for by using a fixed and location-independent factor. The performance of the inverter’s MPP tracking system decreases under dynamic conditions, and therefore depends on the input variability, i.e. the weather conditions experienced by the PV plant. Differences in the statistics of the irradiance slopes experienced at different locations means that MPP tracking losses can vary significantly from one location to another. In this paper, high-quality irradiation time series have been analysed against adapted EN 50530:2010 irradiance slopes. The results indicate an annual fraction of static conditions ranging from approx. 40% to 90%. When combined with typical MPP tracking performance found in the market, this leads to a variation of the overall MPP tracking losses of 0.9% to 0.4%, indicating location-specific data should be applied to increase accuracy in PV energy yield studies.