Analysis of the behavior of current harmonic distortion in inverters interconnected to the electrical grid, through the use of experimental design methodology

Wed, 25 Jan 2023 00:00:00 +0000

In this research work, a study of the behavior of current harmonic distortion was carried out in a load node fed by the public electricity network and by inverters interconnected to the same node. The analysis was developed through an experimental design, using statistical tools such as analysis of variance and complete factorial arrangements, applied to experimental data obtained by configuring a test bench with a common coupling point with the load, where They integrate the powers of the network and renewable systems (photovoltaic), through electronic inverters. The results obtained show that the impact on current harmonic distortion in the load node depends mainly on the type of inverter used and the load connected to the node. In addition, the harmonic flows appear to a greater extent in the supplier's network compared to the harmonics present in the loads connected to the node under study.

Relationship between growth and temperature at the tip of the fatigue crack in AISI 1018 steel

Thu, 23 Mar 2023 00:00:00 +0000

In this work, a study dealing with the correlation between the fatigue crack growth behavior and the temperature evolution at the tip of the fatigue crack of the AISI 1018 steel is presented. Both the crack length and the temperature at the crack tip were experimentally obtained from a fatigue test carried out according to the ASTM E647; the temperature at the crack tip was simultaneously acquired by thermocouples and infrared thermography, while the crack length was acquired through a microscope. The experimental data were processed aimed at plotting the curves of the temperature against cycles as well as the crack length against cycles in order to be able to correlate the information and, therefore, to obtain by linear regression of the experimental data a model to correlate the temperature at the crack tip to the crack length. The results showed that, on one hand, the linear regression is in good agreement with the experimental data, and, on the other hand, the proposed model allows for estimating the trend and the magnitude of the temperature when the crack grows.

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Analysis of the behavior of current harmonic distortion in inverters interconnected to the electrical grid, through the use of experimental design methodology

Relationship between growth and temperature at the tip of the fatigue crack in AISI 1018 steel