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Stator current harmonic elimination control for the high-power synchronous motors with online implementation

机译：在线实现的大功率同步电机定子电流谐波消除控制

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摘要

In order to reduce the switching losses and improve the converter efficiency, the switching frequency of the semiconductor devices is usually kept low. However, the low switching frequency operation could lead to a severe harmonic distortion in the stator current and an undesirable modulation delay, which also affect the current control performance. Here, a stator current harmonic elimination control scheme has been studied for the electrically excited synchronous motor (EESM). First, extracting the stator current amplitudes of the fundamental and harmonic components by the sliding discrete Fourier transform (SDFT) algorithm. Then, these obtained current amplitudes will be taken as a part of the cost function for the current model predictive control strategy along with the switching losses and neutral point potential issues. For the further algorithm simplification and performance improvement, a reduced-order processing has been also introduced to realise a simple digital implementation. Finally, simulation and experiments demonstrate that this kind of stator current control could realise a similar characteristic with the selective harmonic elimination along with an online implementation and nice dynamic performance.
机译：为了减少开关损耗并提高转换器效率，通常将半导体器件的开关频率保持为低。但是，低开关频率操作可能会导致定子电流中严重的谐波失真和不希望的调制延迟，这也会影响电流控制性能。在此，已经研究了电励磁同步电动机（EESM）的定子电流谐波消除控制方案。首先，通过滑动离散傅立叶变换（SDFT）算法提取基波分量和谐波分量的定子电流幅度。然后，这些获得的电流幅度将与开关损耗和中性点潜在问题一起被视为当前模型预测控制策略成本函数的一部分。为了进一步简化算法和提高性能，还引入了降阶处理以实现简单的数字实现。最后，仿真和实验表明，这种定子电流控制可以实现选择性谐波消除的类似特性，并且具有在线实现和良好的动态性能。

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