Abstract
AbstractIn this paper, a multivariable Extremum Seeking MPPT design control is proposed to allow maximum energy extraction from a PV farm. The developed control strategy is verified through simulation studies on a PV farm connected to a large-scale interconnected grid. In this architecture, each PV module is coupled with its own DC/DC converter but with one multivariable controller. This architecture reduces the number of required sensors (hardware reduction). The farm PV is connected to the AC grid via DC-DC boost converters and a three-phase three-level Voltage Source Converter (VSC). The VSC control system uses two control loops: an external control loop that regulates the DC link voltage and an internal control loop that regulates Id and Iq grid currents. Id current reference is the output of the DC voltage external controller. Iq current reference is set to zero in order to maintain the unity power factor. Vd and Vq voltage outputs of the current controller are converted to three modulating signals used by the PWM Generator. A three-phase coupling transformer is used to connect the converter to the grid.KeywordsDC-DC controlMPPTMultivariable extremum seeking controlPhotovoltaic systemUtility grid
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