An Improved Algorithm for MPPT of Photovoltaic System by Zero Voltage Switching Technique

C. Ratsame, T. Tanitteeapan, S. Thepa, N. Mungkung, and I. Boonyaroonate (Thailand)

Keywords

Photovoltaic, MPPT , PI controller, Hill – climbing / Perturbation and Observation Algorithm, QSW Buck converter

Abstract

This paper deals with the design and experimental implementation of a maximum power point tracking (MPPT) for photovoltaic system , The MPP-tracker proposed in this paper is a study the quasi – square ware resonant switch (QSW) DC-DC buck converter the choice for many high efficiency converter that have many advantage when compared with conventional zero voltage switching quasi resonant switches and zero voltage transition(ZVT) converter. which is a this type DC-DC buck converter operating in continuous and discontinuous conduction mode(CCM/DCM) to depend on change of load. The converter is able to draw maximum power from the PV system for a given irradiation level by adjusting the duty cycle of converter. Analytical models are built for the PV system and converter on the basis of the data sheet of manufacturer and the principle of energy conservation. The control technique, implement with a single-chip microcontroller ADMC331, is based on the Hill-climbing / P&O method. From the result obtained it can be concluded that , the MPPT can increase the overall efficiency of the system 87 % for conventional converter. While, the overall efficiency of the converter efficiency when the zero voltage switching by this current technique is used increases 94 % under different atmospheric condition. The accuracy of the proposed scheme is confirmed by experimental.

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