Novel adaptive saturation scheme for photovoltaic inverters with ancillary service capability

The insertion of grid connected photovoltaic (PV) in the power systems have occurred mainly at low and medium voltage. Besides, due to solar irradiance variation, these converters have excess capacity that can be used to provide ancillary services to the main grid. Therefore, this work is focused on the analysis of how PV inverters can perform ancillary services, supporting the grid. Control strategies for reactive power injection and harmonic current compensation are explored. Furthermore, the inverter current saturation for PV inverters is described. The current saturation plays an important role, once high currents can damage the inverter or reduce its lifetime. It is presented a novel adaptive saturation scheme for photovoltaic inverters with ancillary service capability. A Case study for single-phase PV inverters is presented, considering low and high irradiance level scenarios. The simulation results shown the effectiveness of the adaptive current saturation scheme, depicted in this work, for PV inverters.

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