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首页> 外文会议>Applied Power Electronics Conference and Exposition >A Balanced, Unity Power Factor, 3-phase Bridgeless AC/DC Step-up Transformer-less Converter with Magnetic-Coupled Soft-Switched Step-up Rectifiers for Wind Farm with a MVDC Grid
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A Balanced, Unity Power Factor, 3-phase Bridgeless AC/DC Step-up Transformer-less Converter with Magnetic-Coupled Soft-Switched Step-up Rectifiers for Wind Farm with a MVDC Grid

机译：平衡，单位功率因数，三相无限AC / DC升压变压器，具有用于带MVDC网格的风电场的磁耦合软交换升压整流器

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摘要

High voltage gain, high-power AC/DC converters are the key components for medium voltage (MV) step-up power conversion in wind systems with a MVDC grid. This paper presents a new, three-phase bridgeless AC/DC soft-switched, step-up resonant converter with magnetically coupled high-gain output rectifier modules for MV step-up conversion. In the proposed circuit, the output high-gain rectifier stage in all phases are coupled together to improve the output current and voltage balancing issues. While each phase (i.e. each module) has its own dedicated controller to regulate the output voltage in each phase, the coupled magnetics is able to ensure that the output current in each phase is balanced. Similarly, the inductor in the input power factor correction stage in all three phases are also coupled together to reduce the overall number of magnetic components. The operating stages of the proposed converter, and the design of the coupled magnetics will be discussed in this paper. Simulation results are first given on a 1.8MW, 690VAc/44kVdc system to highlight the performance of the proposed converter. Hardware experimental results on a laboratory-scale prototype with an output voltage of 1.2kVdc are finally presented to verify with the proposed converter's performance.
机译：高电压增益，高功率AC / DC转换器是具有MVDC网格的风系统中的中电压（MV）升压功率转换的关键部件。本文提出了一种新的三相无限AC / DC软交换，具有磁耦合高增益输出整流器模块的升压谐振转换器，用于MV加紧转换。在所提出的电路中，所有阶段的输出高增益整流器级耦合在一起以改善输出电流和电压平衡问题。虽然每个阶段（即每个模块）具有自己的专用控制器来调节每个阶段的输出电压，但耦合磁性能够确保每个相中的输出电流是平衡的。类似地，在所有三相中的输入功率因数校正阶段中的电感也耦合在一起以减小磁性分量的整体数量。本文将讨论所提出的转换器的操作阶段和耦合磁性的设计。仿真结果首先给出1.8MW，690VAC / 44KVDC系统，以突出所提出的转换器的性能。最终提出了具有1.2kVDC的输出电压的实验室规模原型的硬件实验结果，以验证所提出的转换器的性能。

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