Enhancement of Steady-State Performance in Direct-Torque-Controlled Dual Three-Phase Permanent-Magnet Synchronous Machine Drives With Modified Switching Table
Enhancement of Steady-State Performance in Direct-Torque-Controlled Dual Three-Phase Permanent-Magnet Synchronous Machine Drives With Modified Switching Table
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DOI：
10.1109/tie.2014.2376881
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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
研究了基于改进开关台的双三相永磁同步电机直接转矩控制策略。经典的ST-DTC方案用于双三相驱动通常会受到严重的电流谐波的惩罚，这会造成巨大的损耗并降低驱动系统的效率。因此，提出了一个由12个新的合成电压矢量组成的改进开关表。利用这种新的开关表，不仅可以很好地控制与转矩产生有关的变量，而且可以在一个采样周期内成功地消除导致电流谐波的变量。此外，提出了一种简单的改进转矩调节器，以减小实时系统中常见的转矩脉动和转矩稳态误差。为了减少计算量，提出了最适合实时系统实现的切换顺序。该策略仅改变了开关表和转矩调节器，没有进行较大的修改，因此保留了经典直接转矩控制的结构简单、鲁棒性好的优点。实验结果验证了该策略的有效性。
This paper investigates the improved switching-table-based direct torque control strategies (ST-DTC) for dual three-phase permanent magnet synchronous machine drives. The classical ST-DTC scheme for dual three-phase drives is usually seriously penalized by significant current harmonics, which cause large losses and reduce the efficiency of the drive system. Hence, a modified switching table consisting of 12 new synthetic voltage vectors is proposed. With this new switching table, not only the variables relating to the torque production are well controlled, but also the variables contributing to the current harmonics are eliminated successfully within one sampling period. Furthermore, a simple modified torque regulator is proposed to reduce the torque ripple and the steady-state error of torque which is usually observed in the real-time system. The switching sequence which is most suitable for the implementation of the real-time system has been proposed to minimize the computation burden. The proposed strategy only changes the switching table and torque regulator without any major modifications, and hence, the merits of the classical direct torque control, i.e., simple structure and good robustness, are still preserved. The experimental results validate the effectiveness of the proposed strategy.