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The use of distributed generating systems based on renewable energy sources has experienced a significant development in the last years. This paper focuses its attention on those based on photovoltaic systems. The intrinsic intermittent nature of this kind of renewable source implies the use of storage to accommodate fluctuations. The present paper proposes an hybrid solution in which photovoltaic source and gas engine are both present without storage device. With this configuration a new control technique can be used to maximizes system efficiency in both grid connection and stand alone operation mode.