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.

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基于Mission Profile的无变压器光伏DC/AC变换器可靠性研究

光伏系统是一种发电技术，由于当前的技术进步而不断增加，并有助于可持续发展。光伏系统的主要阶段是转换阶段、使用逆变器和滤波。这些系统可被视为一种成熟且不断发展的技术；但其可靠性存在一定的不确定性，这些不确定性与运行、事故及其潜在故障有关，受元件数量、环境和运行标称值的影响。为此，本文对用于向电网注入有功功率的单相无变压器光伏逆变器的可靠性进行了比较分析。此评估是在所有分析的逆变器的相同设计规范下进行的；该研究是使用考虑 IEC TR 62380 标准的任务配置文件进行的，其中定义了事件和环境操作条件，以及数值模拟。这项工作旨在提供建议，以提高光伏系统的质量，同时考虑可靠性。