A Contribution to Isolated and Grid-Connected Photovoltaic Systems under Shadow Conditions

The power supplied by photovoltaic panel is sensitive to radiation incident on itself. Both isolated and grid connected applications are very important to keep constant output voltage. The load usually works in constant voltage. Variation on radiation levels may lead to not constant output voltage. This work presents the use of a PID controller in a boost converter able to provide constant voltage for an isolated system, even during radiation variation in solar panel. This work also presents a PI controller to a three-phase inverter CC/CA in grid connected system. The controller is designed to inject the whole power produced by the photovoltaic panels on the grid.

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