Abstract
Photovoltaic systems are a technology for the generation of electrical energy that is constantly increasing thanks to current technological advances and that contributes to sustainable development. The main stages of photovoltaic systems are the conversion stage, using an inverter, and filtering. These systems may be considered as a mature and growing technology; however, regarding its reliability, there exists some uncertainties, and they are related to the operation, incidents, and its potential failures, due to the number of elements, the environment, and the operating nominal values. For this reason, this article presents a comparative analysis of the reliability of single-phase transformerless photovoltaic inverters used to inject active power into the grid. This evaluation is carried out under the same design specifications for all the inverters analyzed; the study is made using a mission profile considering the IEC TR 62380 standard, where the events and environmental operating conditions are defined, and numerical simulations. This work is aimed at providing suggestions to improve the quality of the photovoltaic system also considering reliability.
Highlights
Energy is an essential part of the technological and economic development of countries and regions worldwide
Following the analysis that has been made is recommended to the designer to increase the Mean Time Between Failures (MTBF) of the systems, since it is the parameter that measures the useful life of the system
This article presents the prediction of the reliability of different single-phase inverters using an LCL filter in the filtering stage
Summary
Energy is an essential part of the technological and economic development of countries and regions worldwide. The higher use of those energies, mainly wind and solar photovoltaic, brings favorable effects on the environment, such as the reduction of greenhouse gases and other types of pollutants [1,2,3,4]. Environmentally friendly energies have been developed but with some drawbacks such as high penetration, which causes certain problems within the electrical grid, such as voltage variations. The control of those systems is very complex; the useful life and reliability of photovoltaic systems are becoming important factors [5,6,7]
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