Fundamental Investigations on the Aging of Insulating Materials under Harmonic Distorted Voltages

谐波畸变电压下绝缘材料老化的基础研究

• 批准号: 505291711
• 负责人: Professor Dr. Stefan Kornhuber
• 金额: --
• 依托单位: Institut für Elektrische Energieversorgung und Hochspannungstechnik (IEEH)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/505291711?language=en
• 关键词: Fundamental; Investigations; Aging; Insulating; Materials

The increasing incorporation of renewable energy sources into the electric power systems results in an increasing usage of power electronics. Due to their high switching frequencies, modern power electronics systems are space-saving, efficient and allow flexible operation in energy generation. An example is the solid state transformer, which is generally applied in medium voltage electric grids, transportation and offshore plants due to its compactness. However, the high switching frequencies of power electronics can induce harmonics, which possess frequencies higher than the grid frequency (50 Hz/60 Hz), resulting in a superimposed voltage and thus cause voltage distortion. Voltage distortion can affect the aging of insulation materials applied in electrical equipment, such as epoxy resin and silicone. Other than provoking additional dissipated heat due to increased dielectric loss, voltage distortion can also influence aging processes in terms of electrical and partial discharge aging. The aim of this project is to investigate the electrical and partial discharge aging processes of the insulation materials when stressed with a non-standardised distorted voltage. The influence of the distorted voltage on the voltage endurance behaviour are to be determined. The measurements are conducted on solid insulation materials such as epoxy resin and silicone, which are, amongst others, used in power electronics components and found in power electronics controlled equipment. The investigated voltage waveforms include typical grid voltage distortion as well as superimposed voltages with higher frequencies, which can occur in power converters. Based on the measured results, an advanced phenomenological aging model incorporating the additional stress caused by distorted voltages will be developed. The cooperation between University of Applied Sciences Zittau/Görlitz and TU Dresden allows the combination of the respective expertise regarding distorted voltages as well as electrical and partial discharge aging. The investigations contribute to a better understanding of aging processes in solid insulation materials. Specifically, the advanced aging model, which also takes the additional stress due to distorted voltages into account, will enable the improvement of state-of-the-art and future electrical equipment with to regard the reliability.

可再生能源越来越多地并入电力系统中，导致电力电子设备的使用越来越多。由于开关频率高，现代电力电子系统节省空间，效率高，并允许灵活的发电操作。一个例子是固态Transformer，由于其紧凑性，其通常应用于中压电网、运输和海上工厂。然而，电力电子器件的高开关频率会引起谐波，其具有高于电网频率（50 Hz/60 Hz）的频率，导致叠加电压，从而导致电压失真。电压畸变会影响电气设备中使用的绝缘材料（如环氧树脂和硅酮）的老化。除了由于增加的介电损耗引起额外的耗散热之外，电压失真还可以影响电气和局部放电老化方面的老化过程。本项目的目的是调查的电气和局部放电老化过程的绝缘材料时，强调与非标准化的失真电压。应确定畸变电压对耐压性能的影响。测量是在固体绝缘材料上进行的，如环氧树脂和硅树脂，这些材料用于电力电子元件和电力电子控制设备中。所研究的电压波形包括典型的电网电压失真以及具有较高频率的叠加电压，这可能发生在功率转换器中。基于测量结果，一个先进的唯象老化模型，将扭曲的电压引起的附加应力。应用科学大学齐陶/格尔利茨和德累斯顿工业大学之间的合作可以结合各自在畸变电压以及电气和局部放电老化方面的专业知识。这些调查有助于更好地了解固体绝缘材料的老化过程。具体而言，先进的老化模型，它也考虑到由于畸变电压的额外应力，将使国家的最先进的和未来的电气设备的可靠性方面的改进。