Reduction of Both Harmonic Current and Torque Ripple for Dual Three-Phase Permanent-Magnet Synchronous Machine Using Modified Switching-Table-Based Direct Torque Control
Reduction of Both Harmonic Current and Torque Ripple for Dual Three-Phase Permanent-Magnet Synchronous Machine Using Modified Switching-Table-Based Direct Torque Control
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DOI：
10.1109/tie.2015.2448511
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发表时间：
2015-06
影响因子：
7.7
通讯作者：
Yuan Ren;Z. Zhu
中科院分区：
文献类型：
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作者：
Yuan Ren;Z. Zhu
由于实时系统采样周期固定且有限，基于开关表的直接转矩控制(ST-DTC)的三相永磁同步电机(PMSM)驱动器通常会受到稳态误差和转矩脉动的影响。对于最近被广泛研究的双三相系统，不可避免地会产生谐波电流，这可以看作是第三个问题。这种谐波电流导致损耗的增加和系统效率的降低。以前的文献已经解决了上述问题，但只涉及扭矩脉动问题或谐波电流。因此，本文首先介绍了两种能有效抑制谐波电流的合成矢量，以及最合适的开关顺序。在此基础上，提出了一种改进的五电平力矩调节器来改善力矩性能。该方法不仅抑制了谐波电流，而且在保留了经典ST-DTC结构简单、动态性能优良的优点的同时，大大减小了稳态误差和转矩脉动。实验结果验证了该策略的有效性。
Due to the fixed and limited sampling period in the real-time system, three-phase permanent-magnet synchronous machine (PMSM) drives using switching-table-based direct torque control (ST-DTC) usually suffer from steady-state error and ripple of torque. For the case of the dual three-phase system that has been widely investigated recently, the harmonic currents inevitably occur, which can be regarded as the third issue. This harmonic currents lead to the increase of losses and the decrease of system efficiency. Previous literature has addressed the aforementioned issues but only deals with either the torque ripple issues or harmonic currents. Therefore, this paper first introduces two types of synthetic vectors, which can reduce the harmonic currents effectively, as well as the most suitable switching sequences. Then, a modified five-level torque regulator has been proposed to improve the torque performance. With the proposed method, not only the harmonic currents have been suppressed, but also the steady-state error and ripple of torque can be considerably reduced, whereas the merits of classical ST-DTC, such as simple structure and excellent dynamic performance, are preserved. The experimental results validate the effectiveness of the proposed strategy.