Quasi-resonant multilevel converter for supercapacitor energy storage systems

F. Ibanez
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引用次数: 4

Abstract

There are several topologies that are used in multilevel converters. Most of them use hard-switching techniques to achieve the objective, particularly in modular multilevel converters. It is well known that hard-switching topologies are easier to control but has more switching power losses than soft-switching topologies. Usually, this is not a problem for multilevel converters attached with batteries, where the switching frequency can be kept at a low value. However, in converters for supercapacitors, a very high efficiency and compact design is needed. This is because, the supercapacitors have a very low voltage (∼2.7V) and a modular multilevel converter will use many modules to achieve the desired output voltage value. The use of soft-switching techniques allows the converter to work at a higher frequency by reducing the switching losses. The paper presents a quasi-resonant multilevel converter for supercapacitor storage systems. It analyses both power flow directions and simulations of a 62-supercapacitor converter were performed to validate the analysis.
用于超级电容储能系统的准谐振多电平变换器
在多电平转换器中使用了几种拓扑结构。它们大多采用硬开关技术来实现这一目标,特别是在模块化多电平变换器中。众所周知,硬交换拓扑比软交换拓扑更容易控制,但具有更大的开关功率损耗。通常,对于带有电池的多电平转换器来说,这不是问题,因为开关频率可以保持在较低的值。然而,在超级电容器的变换器中,需要非常高的效率和紧凑的设计。这是因为,超级电容器具有非常低的电压(~ 2.7V),模块化多电平转换器将使用许多模块来实现所需的输出电压值。软开关技术的使用允许变换器工作在一个更高的频率,通过减少开关损耗。提出了一种用于超级电容存储系统的准谐振多电平变换器。对潮流方向进行了分析,并对62超级电容变换器进行了仿真验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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