DocumentCode :
2961326
Title :
Increasing the efficiency of P&O MPPT by converter dynamic matching
Author :
Femia, N. ; Petrone, G. ; Spagnuolo, G. ; Vitell, M.
Author_Institution :
Salerno Univ., Italy
Volume :
2
fYear :
2004
fDate :
4-7 May 2004
Firstpage :
1017
Abstract :
This paper shows that the efficiency of the perturb and observe (P&O) maximum power point tracking (MPPT) control technique can be improved by optimizing its sampling interval Ta according to the converter´s dynamics. During sunny days, when the maximum power point of the photovoltaic (PV) array moves very slowly, the sampling interval Ta must be set as short as possible without causing instability. If the algorithm samples the array voltage and current too quickly, it is subjected to possible mistakes caused by the transient behavior of the PV array+converter system, thus missing temporarily the MPP. As a consequence, the algorithm can be confused, the energy efficiency decays, and the operating point can become unstable, entering disordered behaviors. The solution proposed in this paper lies in choosing Ta according to the converter´s dynamics. The choice of the value of Ta according to the proposed approach ensures a three-level steady-state duty-cycle swing around the MPP, whatever the duty-cycle step-size and the irradiance level are. As an example, a boost MPPT battery charger has been studied.
Keywords :
perturbation techniques; power convertors; solar cell arrays; PV array converter system; boost battery charger; converter dynamic matching; perturb and observe maximum power point tracking; photovoltaic array; three-level steady-state duty-cycle; transient behavior; Batteries; Current-voltage characteristics; Fuzzy logic; Photovoltaic systems; Power generation; Sampling methods; Solar power generation; Steady-state; Temperature; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics, 2004 IEEE International Symposium on
Print_ISBN :
0-7803-8304-4
Type :
conf
DOI :
10.1109/ISIE.2004.1571953
Filename :
1571953
Link To Document :
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