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

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.  

传统的光伏（PV）电池在线阻抗谱（impedance spectroscopy, EIS）测量通常通过两级DC-DC-AC功率转换拓扑实现，其中输入级DC-DC升压变换器既用于功率调节，也用于注入EIS测量所需的小信号交流扰动。这一方案易于实现，原因在于DC-DC升压变换器可通过小信号线性模型进行简便控制。然而，两级拓扑存在功率损耗较大、重量偏高及成本昂贵等问题，因此单级升压DC-AC功率转换已成为研究热点。尽管单级拓扑因结构紧凑、电压增益高及效率优异而备受青睐，但尚未像两级DC-DC-AC拓扑那样，扩展出针对光伏器件的在线EIS诊断功能。这可能是由于DC-AC逆变器中存在较大的输入电流与电压波动/纹波，导致难以建立EIS测量所需的稳态条件。本研究提出一种单级逆变器，称为简化分裂源升压逆变器（simplified split-source boost inverter），其能够生成支持EIS测量所需的连续输入波形。本文还讨论了针对该拓扑的EIS激励技术，以实现对光伏电池简便且有效的在线阻抗谱估计。仿真与实验结果验证了所提方法的有效性。