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首页> 外文期刊>Power Electronics, IET >High power factor high power density high voltage converter based on AC link
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High power factor high power density high voltage converter based on AC link

机译：基于交流链路的高功率因数高功率密度高压转换器

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摘要

To meet the demand of high efficiency, high power density and good input and output performance for high power high voltage converter, the high frequency AC-link scheme, below resonance mode of LCC resonant circuit and soft-switched control method are combined in the proposed converter. The AC-link scheme can bring good performance at input port with small size, the continuous mode can reduce the peak current value in switches and the conduction loss, soft-switching character can reduce the switching loss. To make the combination applicable in high voltage application, this study introduces a control method including switch commutation, control algorithm and control block diagram. To verify accuracy of control parameters and feasibility of the proposed converter, the simulation and experiment are conducted on a 50 kV, 80 kW prototype. It turns out that the experiment results are in agreement with simulation and theoretically expected results. The experimental results also show that the output voltage ripple is less than 1% at 50 kV, the input power factor is 0.99, the total harmonic distortion of input current is less than 7.5%, the total efficiency is 94.5% and power density is 0.93 W/cm3.
机译：为了满足大功率高压变频器的高效率，高功率密度和良好的输入输出性能的需求，提出了高频交流链路方案，LCC谐振电路以下谐振模式和软开关控制方法。转换器。交流链路方案可以在较小的输入端口上带来良好的性能，连续模式可以降低开关中的峰值电流和传导损耗，软开关特性可以降低开关损耗。为了使该组合适用于高压应用，本研究介绍了一种控制方法，包括开关换向，控制算法和控制框图。为了验证控制参数的准确性和所提出的转换器的可行性，对50 kV，80 kW的原型进行了仿真和实验。结果表明，实验结果与仿真结果和理论上的预期结果相符。实验结果还表明，在50 kV时，输出电压纹波小于1％，输入功率因数为0.99，输入电流的总谐波失真小于7.5％，总效率为94.5％，功率密度为0.93 W / cm3。

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