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Title:
 
Appearance of a Drift Problem in Variable-Step Perturbative MPPT Algorithms
 
Author(s):
 
J. Kivimäki, T. Suntio
 
Keywords:
 
Stability, Maximum Power Point Tracking, Variable-Step Algorithm
 
Topic:
 
OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Subtopic: Balance of System Components
Event: 31st European Photovoltaic Solar Energy Conference and Exhibition
Session: 5AO.9.2
 
Pages:
 
1602 - 1608
ISBN: 3-936338-39-6
Paper DOI: 10.4229/EUPVSEC20152015-5AO.9.2
 
Price:
 
 
0,00 EUR
 
Document(s): paper, presentation
 

Abstract/Summary:


Variable-step algorithms have gained interest in recent years due to their ability to overcome wellknown trade-off between steady-state oscillations and fast dynamics related to the fixed-step perturbative algorithms. Although, the optimization of fixed-step algorithms has been investigated thoroughly in previous studies, there is not much research done related to the variable-step algorithms in changing irradiance conditions. It has been shown in this paper that variable-step perturbative algorithms are very sensitive to drift when maximum-power-point (MPP) tracker operates in varying irradiance conditions. The origin of the problem is the same as in fixed-step algorithms - the algorithm cannot distinguish the perturbed power change from power change caused by the variation in irradiance. The existence of drift problem in variable-step perturbative algorithms is shown to be valid by extensive simulations and experimental results and it should be taken into account in variable-step MPPT algorithm design. Moreover, a couple of solutions are proposed to overcome this problem.