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首页> 外文期刊>IEEE Transactions on Power Electronics >A High-Frequency AC-Link Single-Stage Asymmetrical Multilevel Converter for Grid Integration of Renewable Energy Systems
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A High-Frequency AC-Link Single-Stage Asymmetrical Multilevel Converter for Grid Integration of Renewable Energy Systems

机译：用于可再生能源系统并网的高频AC-Link单级不对称多电平转换器

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摘要

Different power electronic converter topologies have been investigated to integrate renewable energy systems to the grid. Cascaded multilevel converters with a high-frequency link have emerged as a viable candidate for such applications. Electrical isolation can be provided using a compact high-frequency transformer connected in the link thus avoiding a bulky line frequency transformer. The use of cascaded modules allows the generation of a multilevel voltage having low total harmonic distortion but increases the overall system size. In this paper, a 15-level high-frequency ac-link single-stage asymmetrical multilevel converter for grid integration is proposed. The single-stage conversion approach eliminates the dc-link capacitors, resulting in a reduced footprint. The asymmetrical module voltages are generated by the multiwinding transformer having unequal turns on each of the secondaries. This allows the generation of 15 output voltage levels, using only three modules in each phase. A modulation strategy is proposed to generate multilevel output voltage. The effect of switch nonidealities on the output voltage is analyzed and two compensation techniques are developed to improve the voltage profile. A multiwinding high-frequency transformer is designed and characterized for the proposed converter. The presented concepts are verified by simulation and further validated experimentally on a three-phase 15-level converter prototype.
机译：已经研究了不同的电力电子转换器拓扑，以将可再生能源系统集成到电网中。具有高频链路的级联多电平转换器已成为此类应用的可行候选者。可以使用连接在链路中的紧凑型高频变压器来提供电隔离，从而避免了笨重的线路频率变压器。级联模块的使用允许产生具有低总谐波失真的多电平电压，但是增加了整个系统的尺寸。本文提出了一种用于电网集成的15级高频ac-link单级不对称多电平转换器。单级转换方法省去了直流链路电容器，从而减小了占位面积。不对称模块电压是由在每个次级绕组上具有不相等匝数的多绕组变压器产生的。这样一来，每相仅使用三个模块，就可以产生15个输出电压电平。提出了一种调制策略来生成多电平输出电压。分析了开关非理想状态对输出电压的影响，并开发了两种补偿技术来改善电压曲线。针对所提出的转换器设计并表征了多绕组高频变压器。提出的概念已通过仿真验证，并在三相15级转换器原型上进行了实验验证。

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