Abstract
This paper presents a non-iterative online approach to identify the modeling parameters of a photovoltaic (PV) module. It is motivated by the fact that accurate and reliable modeling of distributed energy resources (DERs) in DC Microgrids improves their stability and efficiency under a wide range of operational conditions. In particular, the case where PV modules are used as DERs in their current-source region is considered. The proposed method addresses the limitations associated with parameter identification in these settings. Specifically, the method works under varying temperature and insolation conditions relying only on current and voltage sensors that already exist in the power electronic converters tying the PV DER to the Microgrid. Also, its algorithm is practical and reliable as it does not rely on <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a priori</i> knowledge or an initial guess, and it is non-iterative, so it does not risk divergence (or require proof of convergence) as other iterative algorithms. Moreover, it is both fast and of a low computational complexity, which enables its implementation on microcontrollers within PV DER systems. The development of this method is detailed in the paper along with its application steps to facilitate its adoption. Furthermore, an experimental setup was used to test the proposed method under different ambient conditions and demonstrated its efficacy with algorithm execution times of under 1 second and high modeling accuracy on a microcontroller.
Highlights
P HOTOVOLTAIC (PV) systems are becoming the main distributed energy resource (DER) of choice in modernday deployment of renewables
We focus on the operation of the PV system as a DER tied to a DC Microgrid in the current-source region, including the maximum power point (MPP)
A non-iterative parameter identification method was developed in this work for PV modules and implemented on the restricted online operation scenario where they are connected to regulated DC Microgrids
Summary
P HOTOVOLTAIC (PV) systems are becoming the main distributed energy resource (DER) of choice in modernday deployment of renewables. Whether these PV systems are on rooftops or part of a large-scale power plant, they are competitively bringing down the cost of renewables in the electric power production market. In medium to largescale PV systems, PV modules are connected in strings with a string inverter converting their DC power to an AC bus supplying power to the main grid. PV DER modules can alternatively be connected within an autonomous Microgrid. Modeling their performance in these Microgrids is essential for their reliable operation
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