Compensação de rampas de potência em plantas fotovoltaicas centralizadas sem o uso de banco de baterias

Abstract

This work proposes a control strategy for mitigating power ramp events in centralized photovoltaic (PV) plants by using photovoltaic units operating in a curtailed mode combined with the Flexible Power Point Tracking (FPPT) algorithm. The approach aims to ensure grid stability without relying on energy storage systems, thereby reducing operational costs. A 100 MWac PV plant was modeled in the Matlab® & Simulink environment and subjected to various cloud coverage scenarios, simulated through a fractal-based irradiance model. The control system, implemented using a proportional-integral (PI) controller, acted dynamically on the curtailed units to keep the ramp rate within predefined limits. The study analyzed the effects of different ramp rate limits, the presence or absence of power margin recovery, spatial and temporal irradiance variations, and the influence of ramp calculation window sizes on system response. The results demonstrated that the proposed strategy is effective in reducing power fluctuations, enhancing the stability of solar generation, and making it more compliant with the operational requirements of large-scale integration.