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Modeling and Simulation of PV Array and its Performance Enhancement Using MPPT (P&O) Technique

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Author(s): T.Chaitanya | J.Surya Kumari | Ch.Saibabu

Journal: International Journal of Computer Science and Communication Networks
ISSN 2249-5789

Volume: 01;
Issue: 01;
Start page: 09;
Date: 2011;
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Keywords: Photovoltaic system | Boost converter | Maximum power point tracking | and modeling of PV arrays

ABSTRACT
The renewable energy will be an increasingly important part of power generation in the new millennium. Photovoltaic (PV) systems produce DC electricity when sunlight shines on the PV array, requiring little maintenance, and emitting no noise, among others. Day-by –day the energy demand is increasing and thus the need for a renewable source that will not harm the environment are of prime importance. The proposed model uses basic circuit equation of the photovoltaic solar cells including the effects of solar irradiation and temperature changes. The DC-DC converter is used for boosting a low voltage of the PV array up to the high dc bus voltage, which is not less than grid voltage level. A DC-DC converter performs the Maximum Power Point Tracking (MPPT). In photovoltaic systems for getting the maximum power we use MPPT techniques. In these methods open circuit voltage method is one, which is based on the observation that the voltage of the maximum power point is always close to a fixed percentage of the open circuit voltage. This technique uses only 76% of the open circuit voltage as the optimum operating voltage. The Perturb and Observe (P&O) method operates by periodically perturbing (i.e. incrementing or decrementing) the array terminal voltage or current and comparing the PV output power with that of the previous perturbation cycle. The proposed Perturb and Observe control algorithm is a software programme with a self-tuning function which adjusts the array reference voltage and step size of the voltage to achieve maximum power point. The validity of the photo voltaic module with P & O method allows better performance of MPPT due to variation of both power and voltage. This work is proposed to be carried out in MATLAB/SIMULINK environment.
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