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Selecting frequency and parameters of DC-fault tolerant non-isolated high power MMC DC/DC converter

机译:选择DC故障公差非隔离高功率MMC DC / DC转换器的频率和参数

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摘要

This paper studies MMC-based non-isolated DC/DC converter for DC transmission grids. The key design parameters including operating frequency and size of passive components are evaluated with the aim of ensuring DC fault tolerance and minimizing losses and size. An analytical model is used to perform parametric studies while detailed non-linear model is used for verification. The case study on 600MW, 320 kV/250 kV system reveals the narrow range of optimal cell capacitance and arm inductance while lower-side arms require substantially larger capacitors. With the targeted losses of 1.5%, and voltage ripple of +/- 5%, it is recommended to use around 150 Hz operating frequency. For the offshore applications, higher frequency enables significantly smaller size with some increase in losses. The line inductor on the low-voltage side should be much larger than the arm inductor and plays a key role in the dc fault responses.
机译:本文研究了用于直流传动网格的基于MMC的非隔离式DC / DC转换器。通过确保直流容错和最小化损耗和尺寸,评估包括操作频率和无源元件的尺寸的关键设计参数。使用分析模型进行参数研究,而详细的非线性模型用于验证。对600MW,320 kV / 250 kV系统的案例研究揭示了窄范围的最佳电池电容和臂电感,而下侧臂需要基本更大的电容器。具有1.5%的目标损失,+/- 5%的电压纹波,建议使用大约150 Hz的工作频率。对于离岸应用,较高频率使得尺寸的尺寸明显较小,损耗的一些增加。低压侧的线路电感应大于ARM电感器,并在DC故障响应中发挥关键作用。

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