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首页> 外文期刊>Electric power systems research >High-power medium-voltage three-phase ac-dc buck-boost converter for wind energy conversion systems
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High-power medium-voltage three-phase ac-dc buck-boost converter for wind energy conversion systems

机译：用于风能转换系统的大功率中压三相交流-直流降压-升压转换器

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摘要

This paper proposes three topologies of single-stage three-phase ac-dc buck boost converters suitable for medium-voltage and high-power wind energy conversion systems (WECS). The proposed converters draw sinusoidal input currents with nearly unity power factor from wind generators over wide range of ac voltages and frequencies. The proposed converters reduce the voltage and current stresses on the self-commutated switching device compared to existing solutions; thus, promising for new generation of relatively cheap WECSs. The proposed converters operate in Discontinuous Condition Mode (DCM), with their ac terminals connected to three-phase generator with open ended windings, or to ac supply using three single-phase transformers with isolated windings at converter side. The validity of the proposed converters and its detailed theoretical analysis and discussions are confirmed using PSCAD/EMTDC simulations, and further corroborated by experimentations, considering different operating conditions.
机译：本文提出了适用于中压和大功率风能转换系统（WECS）的三种拓扑的单级三相AC-DC降压/升压转换器。所提出的转换器在很宽的交流电压和频率范围内从风力发电机汲取具有几乎单位功率因数的正弦输入电流。与现有解决方案相比，拟议的转换器可降低自换向开关设备上的电压和电流应力；因此，有望用于新一代相对便宜的WECS。拟议的转换器在非连续状态模式（DCM）下工作，其交流端子连接到具有开放式绕组的三相发电机，或者使用三个单相变压器在转换器侧连接到具有隔离绕组的交流电源。拟议的转换器的有效性及其详细的理论分析和讨论已通过PSCAD / EMTDC仿真得到证实，并通过考虑不同的工作条件进行了实验进一步证实。

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