Generalized Two-Vector-Based Model-Predictive Torque Control of Induction Motor Drives
Generalized Two-Vector-Based Model-Predictive Torque Control of Induction Motor Drives
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DOI：
10.1109/tpel.2014.2349508
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
Yongchang Zhang;Haitao Yang
中科院分区：
文献类型：
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作者：
Yongchang Zhang;Haitao Yang
传统的基于单矢量的模型预测转矩控制(MPTC)因其概念直观、响应速度快而受到广泛研究。为了改善MPTC的稳态性能，最近在MPTC中引入了占空比控制的概念，在一个控制周期内插入一个零矢量和一个有功矢量。然而，由于对矢量组合的限制以及矢量选择和矢量持续时间的级联处理，这仍然无法将扭矩误差减小到最小值。通过将矢量组合松弛为任意两个电压矢量，提出了一种广义双矢量MPTC(GTV-MPTC)。通过在预先定义的代价函数中同时评估矢量组合及其持续时间，理论上可以获得扭矩误差的全局最小化。然而，计算负担也显著增加。通过选择适当的方法来确定矢量持续时间，可以消除冗余的矢量组合，从而使所提出的GTV-MPTC适合于实时实现。仿真和实验结果验证了该方法的有效性。仿真结果表明，与采用占空比控制或不采用占空比控制的现有MPTC相比，所提出的GTV-MPTC在较宽的转速范围内以更低的采样频率获得了更好的性能。此外，在中速范围内，平均开关频率甚至低于传统的MPTC。
Conventional single-vector-based model-predictive torque control (MPTC) has been widely studied owing to its intuitive concept and quick response. To improve the steady-state performance, recently, the concept of duty cycle control was introduced in MPTC by inserting a null vector along with an active vector during one control period. However, this still fails to reduce the torque error to a minimal value due to the imposed restriction on vector combination and the cascaded processing of vector selection and vector duration. This paper proposes a generalized two-vectors-based MPTC (GTV-MPTC) by relaxing the vector combination to two arbitrary voltage vectors. By evaluating the vector combination and their durations simultaneously in the predefined cost function, global minimization of torque error can be obtained in theory. However, the computational burden is also significantly increased. By choosing a proper method to determine the vector durations, the redundant vector combinations can be eliminated, which makes the proposed GTV-MPTC suitable for real-time implementation. Both simulation and experimental results were carried out to verify the effectiveness of the proposed method. The presented results show that, compared to prior MPTC with or without duty cycle control, the proposed GTV-MPTC achieves much better performance with lower sampling frequency over a wide speed range. Furthermore, the average switching frequency is even lower than that of conventional MPTC in the medium speed range.