Data for Single Stage DC-AC Boost Inverter-Based Perturbation Technique for Online Impedance Spectroscopy Measurements of Photovoltaic Panels

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Traditional online impedance spectroscopy measurements of PV cells are achieved through two-stage DC-DC-AC power conversion topologies where the input DC-DC boost converter stage is utilized for power regulation and injecting small signal AC perturbations for EIS measurements. It is easily achieved because the DC-DC boost converter can be simply controlled by small signal linear models. However, due to increased power losses, high weight and cost in the two-stage topologies, single stage boost DC-AC power conversion has become an increased subject of research area. Although the single stage topologies have gained popularity for their compactness, high voltage gain and efficiency, it has not been extended to include online EIS diagnostic functionality for the PV device as done in the two stage DC-DC-AC topology. This could be due to high input current and voltage variations/ripples in DC-AC inverters which makes it difficult to establish steady state conditions for EIS measurements. In this research, we propose a type of single stage inverter, called the simplified split-source boost inverter which presents the ability to produce continuous input waveforms desirable to support EIS measurements. EIS excitation techniques for the proposed topology to ensure simple and effective online impedance spectroscopy estimation of PV cells are discussed. Simulation and experimental results validate the proposed method.