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Evaluation on High-Efficiency Thermoelectric Generation Systems Based on Differential Power Processing

机译:基于差分功率处理的高效热电发电系统评估

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Thermoelectric generators (TEGs) convert thermal energy directly into electrical energy using thermoelectric materials, with attractive advantages such as a lack of noise and pollution, considerable reliability, and a long lifetime. Because of the low output power and low output voltage of each TEG module, conventional thermoelectric generation systems are constituted by a centralized converter with series-connected multiple TEG modules. Power mismatch usually occurs in this system configuration due to the unbalanced temperature difference distribution, which results in lower conversion efficiency. In this paper, two solutions based on differential power processing (DPP) have been proposed to enhance the output power and conversion efficiency of the TEG system: the centralized-distributed hybrid structure and the cascaded power transfer structure, both of which realize the maximum power point tracking of each TEG module. The circuit designs and control strategies of the two proposed systems are here presented. Experimental results have demonstrated the feasibility and effectiveness of these two solutions; they have higher output power and better efficiency than the conventional TEG system. Each of these two solutions exhibits its own features and has suitable application situations. If the temperature difference distribution of all TEG modules has significant variations, the centralized-distributed hybrid structure outperforms the cascaded power transfer structure on the output power. While the temperature difference distribution is comparatively stable, the cascaded power transfer structure is superior to the centralized-distributed hybrid structure. With detailed evaluation and comparison between the two structures, the overall design for DPP-based TEG systems with different connection types has been proposed in this paper, which is the reference for the future implementation of practical TEG applications.
机译:热电发电机(TEG)使用热电材料将热能直接转换为电能,具有诱人的优势,例如,没有噪音和污染,可靠性高,使用寿命长。由于每个TEG模块的低输出功率和低输出电压,常规的热电发电系统由具有串联连接的多个TEG模块的集中式转换器构成。由于温度差分布不平衡,通常在此系统配置中发生功率不匹配,从而导致转换效率降低。为了提高TEG系统的输出功率和转换效率,本文提出了两种基于差分功率处理(DPP)的解决方案:集中式分布式混合结构和级联功率传输结构,它们都实现了最大功率。每个TEG模块的点跟踪。这里介绍了两个拟议系统的电路设计和控制策略。实验结果证明了这两种解决方案的可行性和有效性。与传统的TEG系统相比,它们具有更高的输出功率和更高的效率。这两种解决方案中的每一种都有自己的功能,并具有合适的应用场合。如果所有TEG模块的温差分布具有显着差异,则集中分布的混合结构在输出功率上将优于级联功率传输结构。虽然温差分布比较稳定,但级联功率传输结构优于集中式分布式混合结构。通过对这两种结构的详细评估和比较,本文提出了具有不同连接类型的基于DPP的TEG系统的总体设计,为将来实际TEG应用的实现提供了参考。

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