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This paper presents a parameter estimation technique to determine the photovoltaic (PV) cell parameters from experimental measurements, using the direct search optimization method. A double diode model is considered to represent a photovoltaic (PV) cell, and a Matlab simulation is built to demonstrate the effects of varying various parameters on the output performance. The direct search optimization technique is used to estimate the cell parameters by reshaping the simulated output characteristics to match similar experimental measurements. The procedures that illustrate the implementation of the proposed technique to estimate the PV cell parameters are detailed. The technique is implemented to estimate the parameters of SUNSET PV Module Model PX-170 from experimental measurements. The convergence characteristics of the most sensitive cell parameters are given. The validity of the proposed technique is verified by comparing simulated results obtained using the estimated parameters and their corresponding measurements. The techniques and methodology presented in this paper are of prime importance to power system engineers forming a useful tool for studying power systems including photovoltaic sources.

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