NDLI: Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses

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Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses

Content Provider	MDPI
Author	Ye, Donghui Riquelme-Dominguez, Jose Miguel Martinez, Sergio
Copyright Year	2022
Description	Power curtailment methods contribute to the frequency stability of power systems with a high share of photovoltaic generation. This paper focuses on an online strategy that estimates the output characteristic of a photovoltaic generator while operating in power curtailment mode by using voltage and current measurements and the nonlinear least-squares curve-fitting. In contrast to previously reported methods, this work introduces an improvement consisting of the estimation of the power losses of the electronic converter that connects the photovoltaic panel with the grid. Thus, the impact of a mismatch between the dc-side and the ac-side is reduced. The procedure is tested at different power levels and with fluctuations of irradiance and temperature. The results show that the converter efficiency, expressed as an exponential function with two quadratic equations, is associated with irradiance and temperature. It is also found that the two-stage converter efficiency is mainly affected by the irradiance level when the photovoltaic system operates on the left side of the power-voltage characteristic. In contrast, the temperature level influences the converter efficiency significantly when working on the right side of the maximum power point. The estimated efficiency curves can improve the accuracy of the power curtailment method and can be used for designing the two-stage converter. The effectiveness of the proposed power curtailment method has been tested in a two-stage photovoltaic system through MATLAB/Simulink.
Starting Page	1544
e-ISSN	20799292
DOI	10.3390/electronics11101544
Journal	Electronics
Issue Number	10
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2022-05-12
Access Restriction	Open
Subject Keyword	Electronics Industrial Engineering Converter Efficiency Grid-connected Power System Nonlinear Least-squares Curve-fitting Photovoltaic (pv) Power Curtailment Method
Content Type	Text
Resource Type	Article

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