Transformerless multi-level converter based medium voltage drives
Transformerless multi-level converter based medium voltage drives
复制标题
基于无变压器多电平转换器的中压驱动器
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Winkelnkemper
中科院分区：
文献类型：
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作者：
P. Steimer;M. Winkelnkemper
提出了无变压器中压驱动器的新概念，避免了任何共模电感器。通过在电网侧引入一个小型电容滤波器，并在星点处采用低阻抗接地连接，可以实现对地的主要共模电压电容耦合。在低阻抗和高阻抗接地系统中，没有显着的共模电压或电流到达电网。结果表明，即使对于标准电机和改造应用，中压电机绕组上的额外共模应力和相关轴承电流效应也能得到很好的控制。演示的概念可应用于任何类型的基于 VSI 的多级转换器，例如 ANPCML 和 MMLC 转换器解决方案。
A new concept for transformerless medium voltage drives is presented, which avoids any common-mode inductors. By introducing a small capacitive filter on the grid side with a low-impedance ground connection at the star-point, a dominant common-mode voltage capacitive coupling to ground is achieved. No significant common-mode voltages or currents are reaching the grid in low- and high-impedance grounded systems. It is shown, that the additional common-mode stress on the medium voltage machine windings and related bearing current effects are well under control even for standard electrical machines and retrofit applications. The demonstrated concept can be applied to any kind of VSI based multi-level converter, as for example for ANPCML and MMLC converter solutions.