Abstract
Three-phase inverters for photovoltaic grid-connected applications typically require some form of grid voltage phase detection in order to properly synchronize to the grid and control real and reactive power generation. A phase locked loop is used to determine this type of phase detection. However, in the present work, a method is proposed whereby the phase angle of the grid can be accurately identified solely via the grid current feedback. This phase observer is incorporated into a current controller which can manage the real and reactive power. Moreover, the maximum power point of the photovoltaic arrays is achieved without using a DC-DC converter. The design of this combined observer/controller system is motivated and validated via a Lyapunov stability analysis. Simulation results under various operating conditions are provided for further validation.
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