Decoupled Photovoltaic Power Ramp-rate Calculation Method for Perturb and Observe Algorithms

As photovoltaic energy increasingly penetrates in power systems, transmission system operators have started to request its participation providing ancillary services. One of the demanded services is ramp-rate control (PRRC), which attempts limit ramps produced by intermittent irradiance conditions. In order achieve desired objective, solutions based on storage systems or modifying maximum point tracking (MPPT) perturb and observe (P&O) algorithms are commonly adopted. The starting PRRC determination instantaneous ramp-rate, different methods been proposed literature for calculation. However, accuracy computational speed existing procedures can be improved, may critical situations with rapid fluctuations. this paper, a decoupled calculation method presented, effect variable P&O algorithm computed separately. has theoretically demonstrated tested through simulation experimental tests. Simulation results show that it improve previous terms computation time. Experimental validation hardware-in-the-loop demonstrates suitability real-time applications, even presence noisy measurements.