用于高压直流抽头的模块化多电平DC/DC转换器架构

T. Luth, M. Merlin, T. Green
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引用次数: 50

摘要

高压直流(HVDC)方案中直流电压等级之间的DC/DC连接对于链路之间的互连和作为注入/提取相对少量电力的抽头非常有用。高电压转换比(如500kv至50kv)的抽头在合理使用半导体额定值的情况下尤其具有挑战性。分析和比较了直流/直流变换器的四种结构,包括直接连接和变压器接口,它们的额定视在功率(额定电流乘以所有单元堆叠的额定电流之和)与吞吐量的比值。研究发现,直接转换架构只有在低转换比(2:1或更低)下才具有合理的功率容量因子,但包含变压器和中间方波操作后,在合理的功率容量因子下,可以实现更宽的转换比。对于每个设计,已经确定了电池平衡电流的性质,因为这是决定每个电池堆中总电流的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modular multilevel DC/DC converter architectures for HVDC taps
DC/DC connections between DC voltage levels in High Voltage Direct Current (HVDC) schemes are useful for interconnection between links and as taps to inject/extract relatively small amounts of power. Taps with high voltage transformation ratios (such as 500 kV to 50 kV) are particularly challenging to achieve with reasonable use of semiconductor ratings. Four architectures of DC/DC converter covering both direct connection and transformer-interfaced are analysed and compared in terms of the ratio of their apparent power rating (rated current times rated current summed across all stacks of the cells) to the throughput power. It is found that the direct conversion architectures have reasonable power capacity factor only for low transformation ratios (of 2:1 or less) but the inclusion of a transformer and intermediate square-wave operation allows much wider transformation ratios with a reasonable power capacity factor. For each design the nature of the cell-balancing currents has been determined since this is a major factor in determining the total current flow in each cell stack.
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