Abordagem de Controle para a Operação Descarregada de Plantas Fotovoltaicas de Grande Porte
Keywords: Utility-scale photovoltaic power plants, Control of large photovoltaic power plants, De-loaded operation, Ancillary services, Power output variability
AbstractThe increasing integration of photovoltaic (PV) generation in power systems reduces the frequency regulation capability and deteriorates the frequency dynamic behavior, highlighting the importance of PV generation support to the grid ancillary services. The de-loaded operation is one of the control approaches which enable PV systems to participate in frequency regulation and inertial response support. However, the estimation of the maximum available power in large-scale PV power plants is a relevant technical challenge for the de-loaded operation. In this context, this work proposes a control approach to allow the de-loaded operation of large-scale PV power plants. The proposed approach enables real time estimation of the maximum available power by scanning the P-V curve of the PV array. The proposed control approach was evaluated and validated in a 100 MWac PV power plant, considering realistic irradiance variations generated by fractals that emulate the typical movement of clouds. The results have shown the effectiveness of the proposed strategy in estimating the maximum available power and tracking the power reference defined by de-loaded margin.