| At present, the problem of energy crisis is becoming more and more serious thanever before. As a new solar energy in the new energy, it has clean, safe, pollution-freeand inexhaustible supply outstanding merits. The grid-connected Photovoltaic systembecomes an important research topic at home and abroad in the photovoltaic field.Aim at the technological problems of grid-connected Photovoltaic system, thispaper focuses on two-stage grid-connected Photovoltaic generation system. This studytries to put up two points, one is Maximum Power Point Tracking (MPPT) method,the other is DC-DC link. In this paper, MPPT method is fuzzy logic control basedperturb and observe. Improved boost converter, with the interleaving technology andsoft switching technique, is used as DC-DC converters.The output of photovoltaic battery has obvious non-linear features, therefore, itneeds to track and control the Maximum Power Point for photovoltaic battery.Compare and analyze several common MPPT algorithms, this paper mainly analyzesfuzzy logic control based perturb and observe. The conventional perturbation andobservation controller and fuzzy logic control based perturb and observe arecompared by simulation. Improve the conventional boost converter, using theinterleaving technology and soft switching technique, becomes improved interleavedboost converter. The validity and feasibility of the circuit is be validated by simulation.Combine fuzzy logic control based perturb and observe of photovoltaic cell andimproved interleaved boost converter as a whole, establish fuzzy logic control basedperturb and observe based on improved interleaved boost converter in grid-connectedPhotovoltaic system. Results of this simulation are compared to those obtained by theconventional boost converter and improved interleaved boost converter. The resultsshow that the improved circuit can reduce losses and improve the system efficiency. |
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