MPP estimation of PV systems keeping power reserves under fast irradiance changes

Batzelis, Efstratios I., Junyent-Ferre, Adria and Pal, Bikash C. (2020) MPP estimation of PV systems keeping power reserves under fast irradiance changes. In 2020 IEEE Power and Energy Society General Meeting, PESGM 2020. vol. 2020-August, IEEE.. (doi:10.1109/PESGM41954.2020.9281698).

Abstract

Maintaining power reserves in a photovoltaic (PV) system, i.e. operating at a curtailed power level, is a promising method towards grid support functions without energy storage. A major challenge in this approach is to monitor the maximum power (i.e. the available headroom) as it changes over time with the irradiance and temperature. This paper presents a new method to estimate the maximum power point (MPP) power and voltage in real-time, designed for very fast irradiance changes. While keeping reserves, the single-diode PV model equations are applied to voltage and current samples to estimate the conditions and maximum power, rather than using potential erroneous irradiance and temperature sensors. This is the first model-based method to guarantee estimation robustness regardless of the irradiance transient. Furthermore, the operating point perturbation is infrequent and limited, resulting in near-perfect MPPT efficiency at zero reserve levels. The effectiveness of the proposed method is validated via simulations in MATLAB/Simulink on a 10 kW PV system assuming noisy measurements.

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Contributors

Author: Efstratios I. Batzelis

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