The main followed objectives within control strategies dedicated to hybrid micro\ngrid systems (wind/hydro/solar), that operate based on maximum power point tracking (MPPT)\ntechniques are to improve the conversion systems efficiency and to maintain the quality of the\nproduced electrical energy (the voltage and power factor control). One of the main goals of\nmaximum power point tracking strategy is to achieve the harvesting of the maximal possible\nenergy within a pre-set time period. In order to implement the control strategies for micro grid\nsystems that operate at time variable parameter, there are usually required specific transducers\n(anemometer for wind speed measurement, optical rotational transducers, taco generators, etc.).\nIn the technical literature there are presented several variants of the MPPT techniques, which\nare particularized at several applications (wind energy conversion systems, solar systems,\nhydro plants and micro grid hybrid systems). The maximum power point tracking\nimplementations are mainly based on two-level architecture. The inferior level controls the\nprimary variables, while the superior level represents the MPPT control structure. In the paper,\nauthors present some micro grid structures proposed at Politehnica University Timisoara within\nthe frame of a research grant. The paper is focused on the application of MPPT strategies on\nhybrid micro grid systems. There are presented several structures and control strategies and are\nhighlighted their advantages and disadvantages, together with practical implementation\nguidelines.
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