互连变流器在双极直流微电网中的应用

Saman Dadjo Tavakoli, Gholamreza Kadkhodaei, M. Mahdavyfakhr, M. Hamzeh, K. Sheshyekani
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引用次数: 4

摘要

本文研究了两种转换器拓扑结构,包括中性点二极管箝位(NPC)和维也纳转换器,用于双极直流微电网的互连转换器。由于双极直流微电网受到严重的电压不平衡,因此互连变流器应该能够在其直流链路电容器上执行电压平衡功能。此外,它们还应在双极直流微电网的上下端之间进行功率交换。研究表明,电压平衡功能无法集成到NPC变换器的控制系统中,因此建议并联电压平衡器,并设计相应的电压控制系统。此外,提出了一种改进拓扑结构和开关算法的维也纳变换器来实现电压平衡功能。利用MATLAB软件对NPC和Vienna变换器的可行性进行了评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interlinking converters in application of bipolar dc microgrids
This paper investigates two converter topologies, including neutral-point diode-clamped (NPC) and Vienna converters, to be employed as an interlinking converter in bipolar dc microgrid. Since bipolar dc microgrids are subjected to severe voltage unbalance, the interlinking converters should be able to perform voltage-balancing function at their dc-link capacitors. In addition, they should exchange power between upper and lower terminals of bipolar dc microgrid. It is shown that the voltage-balancing function can not be integrated into the control system of the NPC converter, so the parallel connection of a voltage balancer is suggested and the pertinent voltage control system is designed. Moreover, a Vienna converter with modified topology and switching algorithm is proposed to perform voltage-balancing function. The viability of NPC and Vienna converters is evaluated using MATLAB software.
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