Predictive torque control for voltage source inverter-permanent magnet synchronous motor based on equal torque effect
Predictive torque control for voltage source inverter-permanent magnet synchronous motor based on equal torque effect
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DOI：
10.1049/iet-epa.2015.0310
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发表时间：
2016-03
影响因子：
1.7
通讯作者：
C. Xia;Xudong Qiu;Zhiqiang Wang;T. Shi
中科院分区：
文献类型：
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作者：
C. Xia;Xudong Qiu;Zhiqiang Wang;T. Shi
本文发现了等扭矩效应（ET效应），即通过施加不同的电压矢量可以获得相同的扭矩，其端点位于一条称为等扭矩曲线（ET曲线）的特殊曲线上。借助ET效应，提出了一种改进的无权重因子预测扭矩控制（PTC）。首先，为了获得端点位于 ET 曲线上的伏秒矢量，所提出的 PTC 计算与 ET 曲线相交的所有电压矢量的占空比，然后通过累加这些伏秒矢量来建立有限控制集。其次，定义仅包括磁通误差的成本函数来选择最佳伏秒矢量，从而避免权重因子调整，因为成本函数中不再存在扭矩误差。由于扭矩和磁通的两步优化，所提出的PTC可以避免标准PTC中占空比不能充分利用的问题。因此，所提出的 PTC 比标准 PTC 和具有占空比的 PTC 具有更好的扭矩和磁通性能。最后，进行了实验来验证所提出的 PTC 策略。
In this paper, equal torque effect (ET-effect) is discovered, which means that the same torque can be obtained by applying different voltage vectors whose terminals locate on a special curve called the equal torque curve (ET-curve). By means of ET-effect, an improved predictive torque control (PTC) without weighting factor is proposed. First, to obtain the volt-sec vectors whose terminals locate on the ET-curve, the proposed PTC calculates the duty cycles of all the voltage vectors intersected with the ET-curve, and then establishes finite control set by accumulating those volt-sec vectors. Second, a cost function that includes only the flux error is defined to select the optimal volt-sec vector, and thus to avoid weighting factor adjustment since the torque error no longer exists in the cost function. Because of the two-step optimisation of torque and flux, the proposed PTC can avoid the problem that the duty cycle cannot be fully utilised in standard PTC. As a result, the proposed PTC achieves better performance of torque and flux than standard PTC and PTC with duty cycle. Finally, experiments have been carried out to validate the proposed PTC strategy.