研究目的
Investigating the optimal DC-to-AC sizing ratio for concentrator photovoltaic (CPV) power plants, considering the impact of shading, module misalignment, and different inverter configurations to maximize performance ratio and minimize levelised cost of energy.
研究成果
The study concludes that the impact of shading cannot be neglected when maximizing the performance ratio, especially for high-capacity inverters. The economic optimum DC-to-AC sizing ratio is significantly higher than the energetic optimum. String-inverters are the most competitive option in terms of levelised cost of energy, except in cases of very low ground cover ratio where tracker-inverters are preferable. Micro-inverters are not competitive due to high investment costs.
研究不足
The study assumes ideal Maximum Power Point Trackers (MPPTs) that perfectly track the maximum power point of the connected array. The impact of soiling is set to a fixed loss coefficient, and the study does not account for dynamic changes in soiling over time. The economic analysis is based on specific locations and may not be directly applicable to other regions without adjustments.
1：Experimental Design and Method Selection:
The study is based on the experimental characterization of a typical CPV module, including its air mass correction function, angular response, cell temperature relation to atmospheric parameters, and I-V curve characterization. A power plant model was developed to simulate different inverter configurations and shading impacts.
2：Sample Selection and Data Sources:
Outdoor characterization of a CPV module was carried out at the Centre for Advanced Studies in Energy and Environment (CEAEMA) of University of Jaén, Southern Spain. Solar radiation and ambient temperature data were obtained from the NASA Langley Research Center (LaRC) POWER Project.
3：List of Experimental Equipment and Materials:
The experimental setup included a two-axis sun tracker, an atmospheric station equipped with a pyreliometer, a four-wire electronic load for measuring the module I-V curve, and a temperature sensor.
4：Experimental Procedures and Operational Workflow:
The module's air mass correction function and angular response were characterized from data registered over a one-year experimental campaign. The cell temperature relation to ambient temperature, DNI, and wind speed was characterized as a linear relationship. The solar cell I-V curve was characterized by selecting 49 experimental I-V curves covering a wide range of operating conditions.
5：Data Analysis Methods:
The study used a circuit solver programmed in Matlab? environment for analyzing the series-parallel interconnection of every solar receiver feeding power to each inverter. The performance ratio (PR) and levelised cost of energy (LCOE) were calculated to evaluate the system's energetic and economic performance.
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