D. Granozio

Università degli Studi di Salerno, Salerno, Campania, Italy

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Publications (3)2.6 Total impact

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    ABSTRACT: The perturb and observe (P&O) best operation conditions are investigated in order to identify the edge efficiency performances of this most popular maximum power point tracking (MPPT) technique for photovoltaic (PV) applications. It is shown that P&O may guarantee top-level efficiency, provided that a proper predictive (by means of a parabolic interpolation of the last three operating points) and adaptive (based on the measure of the actual power) hill climbing strategy is adopted. The approach proposed is aimed at realizing, in addition to absolute best tracking performances, high robustness and promptness both in sunny and cloudy weather conditions. The power gain with respect to standard P&O technique is proved by means of simulation results and experimental measurements performed on a low power system. Besides the performance improvements, it is shown that the proposed approach allows possible reduction of hardware costs of analog-to-digital (A/D) converters used in the MPPT control circuitry.
    IEEE Transactions on Aerospace and Electronic Systems 08/2007; · 1.30 Impact Factor
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    ABSTRACT: The use of one-cycle control (OCC) for maximum power point tracking (MPPT) and power factor correction (PFC) in grid connected photovoltaic (PV) applications is discussed. Circuit and operating parameters of the one cycle-based controller of a cost-effective single-stage inverter are optimized in order to obtain the best performances of the system under different irradiance levels. Firstly, design constraints are formulated which allow to get a very efficient OCC operation in terms of power extracted from the PV array, stability, and PFC. Afterwards, such constraints are used to perform the parametric optimization of the one cycle controller by means of suitable heuristic approaches. Various selection criteria of the best parameters set under different conditions are discussed and applied. Finally, a customized perturb and observe (P&O) control is applied to the optimized one cycle controlled single-stage inverter in order to perform a real MPPT in presence of varying irradiance conditions. Subjects described here are covered by the Italian Patent Application SA2005A000014-13.07.2005 and PCT Application PCT/IT2005/000747-20.12.2005
    IEEE Transactions on Aerospace and Electronic Systems 08/2006; · 1.30 Impact Factor
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    ABSTRACT: This work presents a single-stage photovoltaic inverter which is based on one-cycle control. Such an inverter is characterized by two original features. The first one lies in a new formulation of the set of equations for the design of the one-cycle control circuitry of the inverter, such constraints are explained in L. Egiziano et al. (2006) and are here used to select the optimal solution. The second original characteristic of the proposed inverter lies in the development of a Perturb&Observe maximum power point tracking technique customized for a one cycle controlled single-stage inverter (patent pending) based on a sub set of the constraints reported in L. Egiziano et al. (2006). The results obtained show that the performances of the proposed system are top level and that the proposed solution represents the first true single stage photovoltaic inverter
    Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on; 06/2006