Giraldo-Castañeda, Carlos A.

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    Maximum power point tracking using modified p&o method for the off grid radar
    (2008) Giraldo-Castañeda, Carlos A.; Orama-Exclusa, Lionel R.; College of Engineering; Cruz-Pol, Sandra L.; Colom-Ustáriz, José G.; Department of Electrical and Computer Engineering; Maldonado, Francisco
    This work presents the design and implementation of Maximum Power Point Tracking (MPPT) techniques for photovoltaic arrays using a DSP embedded system for the application to Off-the-Grid Radars, providing a cost-effective solution which improves upon some of the constraints of previous methods. Two methods were implemented using modifications to Perturbation and Observation methods. The methods implemented are the Improved Perturbation and Observation (IP&O) and the proposed Selective Hopping (SH) method. The performance of each system was measured with respect to time convergence, power available, dynamic of the system and response to rapid variations of solar radiation. The techniques were evaluated in similar conditions in terms of temperature and solar radiation for a comparison. Both techniques used a hysteresis system that allows a decrease in the switching loss in the rapid variations of solar radiation. The Selective Hopping technique allowed for improvement on some constraints of the IP&O technique. SH has a convergence time at least ten times faster than IP&O and it has approximately 5% more available power. The main problem with the SH method is that a local maximum power point emerges when the solar radiation changes instantaneously, for example (0-700 W/m2). However, these variations are not likely to happen in normal operation.