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首页> 外文期刊>World journal of modelling and simulation >Combined effect of fuzzy logic controller and optimized voltage vector in torque ripple reduction of direct torque controlled permanent magnet synchronous motor
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Combined effect of fuzzy logic controller and optimized voltage vector in torque ripple reduction of direct torque controlled permanent magnet synchronous motor

机译：模糊逻辑控制器与优化电压矢量的组合作用在直接转矩控制永磁同步电动机转矩脉动减小中

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摘要

The Direct Torque Control (DTC) technique for Permanent Magnet Synchronous Motor (PMSM) has received increasing attention due to its simplicity and robust dynamic response compared with other control techniques. The classical switching table based DTC provides larger torque ripple and many techniques have been proposed in the literature to reduce torque ripple. Most of these are usually complicated and have more computational burden. It is mathematically proved that the voltage vector influences the electromagnetic torque of PMSM. Thus, by using the effective voltage vector combination in the switching table, the torque ripple can be minimized. The increment in the level of inverter provides 27 voltage vectors with different magnitudes, namely large, medium, small and zero. In the proposed DTC methods, 27 voltage vectors are allowed to form different groups of voltage vectors such as Large-Zero (LZ), Medium-Zero (MZ), Small-Zero (SZ), Large-Medium-Zero (LMZ), Large-Small-Zero (LSZ), Medium-Small-Zero (MSZ) and Large-Medium-Small-Zero (LMSZ). Based on these groups, the seven new switching tables are formulated and the conventional switching table is replaced by the proposed switching table. In the first stage, the switching tables are incorporated with the six sector based DTC methods which provide lesser torque ripple. The DTC method reduces the torque ripple with the maximum of 45.71% in comparison to the classical DTC. The accuracy of the reference torque magnitude also contributes to the torque ripple reduction. In the classical DTC method, the reference torque magnitude is calculated with the help of Proportional-Integral (PI) controller. In order to calculate the accurate reference torque magnitude, the Fuzzy-PI based controller is designed. The fuzzy-PI based methods minimized the torque ripple up to 61.93% for twelve sector based DTC method. The proposed DTC methods (with FLC and without FLC) are comparatively investigated with the classical DTC and existing literatures. It can be observed that the proposed DTC methods not only reduce the torque ripple, but also significantly reduce the flux ripple, average commutation frequency and improves the quality of stator current waveform compared with traditional and existing methods. Consequently, the effectiveness of the DTC method is justified by experimental results.
机译：与其他控制技术相比，永磁同步电动机（PMSM）的直接转矩控制（DTC）技术因其简单性和强大的动态响应而受到越来越多的关注。基于经典切换表的DTC提供了较大的转矩脉动，文献中提出了许多技术来减小转矩脉动。这些中的大多数通常很复杂并且具有更多的计算负担。数学上证明了电压矢量会影响PMSM的电磁转矩。因此，通过在切换表中使用有效电压矢量组合，可以将转矩脉动最小化。逆变器电平的增加提供了27个不同大小的电压矢量，即大，中，小和零。在提出的DTC方法中，允许27个电压矢量形成不同的电压矢量组，例如大零（LZ），中零（MZ），小零（SZ），大中零（LMZ），大中小零（LSZ），中小零（MSZ）和大中小零（LMSZ）。基于这些组，制定了七个新的交换表，并用建议的交换表代替了常规的交换表。在第一阶段，切换表与基于六个扇区的DTC方法结合在一起，可提供较小的转矩波动。与经典DTC相比，DTC方法最大可减少45.71％的转矩脉动。参考转矩幅度的准确性也有助于减小转矩波动。在经典的DTC方法中，参考转矩大小是借助比例积分（PI）控制器来计算的。为了计算准确的参考扭矩大小，设计了基于Fuzzy-PI的控制器。基于模糊PI的方法将基于十二个扇区的DTC方法的转矩脉动最小化到61.93％。通过经典DTC和现有文献对提议的DTC方法（使用FLC和不使用FLC）进行了比较研究。可以看出，与传统方法和现有方法相比，提出的直接转矩控制方法不仅可以减小转矩脉动，而且可以显着减小磁通脉动，平均换向频率并提高定子电流波形的质量。因此，实验结果证明了DTC方法的有效性。

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