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1、河南理工大学外文文献翻译本科毕业设计外文文献及译文文献题目：Direct Torque Control of Induction Motors Utilizing Three-Level Voltage Source Inverters文献作者：Xavier del Toro Garcia, Antoni Arias, Marcel G. Jayne and Phil A. Witting文献来源：IEEE Trans. Ind. Electron, vol. 51，No. 4，pp. 744757发表日期：2004年8月班 级：姓 名： 学 号：指导教师：翻译日期：英文原文：Direct T
2、orque Control of Induction Motors Utilizing Three-Level Voltage Source InvertersXavier del Toro Garcia, Antoni Arias, Marcel G. Jayne,and Phil A. WittingAbstractA new control strategy for induction motors based on direct torque control is presented which employs a three-level inverter instead of the
3、 standard two-level inverter. The controller is designed to achieve a torque ripple reduction by taking advantage of the increase in the number of inverter states available in a three-level inverter. The harmonic distortion in the stator currents and the switching frequency of the semi-conductor dev
4、ices are also reduced in the new control system presented.Index TermsInduction motor drives, three-level converter, torque control.I. INTRODUCTIONThe standard voltage source inverter (VSI) traditionally used in electrical drive systems is the two-level VSI, which unfortunately has a number of inhere
5、nt limitations. For example, the maximum voltage that can be supported by the semiconductor switching devices in the VSI limits the maximum value of dc-link voltage. Furthermore, the output voltages and currents from the VSI can contain high harmonic distortion. The output voltage waveforms can also
6、 contain large values of dV/dt, which contribute to the degradation of the machine windings insulation and bearings, and also produce considerable electromag-netic interference during operation. New multilevel VSI topologies,however, can considerably reduce many of these limitations 1.The most commo
7、nly used multilevel topology is the three-level neutral point clamped (NPC) VSI 2. This type of VSI has advantages over the standard two-level VSI, such as a greater number of levels in the output voltage waveforms, less harmonic distortion, and lower switching frequencies.Direct torque control (DTC
8、) has emerged to become a possible alternative to the well-known vector control strategies for induction motor control systems 3, 4. Although considerable research has been made into the two-level topologies associated with this method of control, the amount of research carried out to date into DTC
9、systems employing multilevel topologies is still rather limited. The major advantage of the three-level VSI topology when applied to DTC is the increase in the number of voltage vectors available. This means the number of possibilities in the vector selection process is greatly increased and leads t
10、o a more accurate control system, which can result in a reduction of the torque and flux ripples. This is of course achieved at the expense of an increase in the complexity of the vector selection process. Although several authors have recently proposed the implementation of DTC utilizing this highe
11、r-level topology, their approaches are based on the use of more complex vector selection tables combined with modulation techniques based on analytical methods which have machine parameter dependency 5 6. A different approach is a selection table based on the concept of virtual vectors 7. These new
12、methods considerably increase the complexity of the control strategy when compared to the classical DTC system 3, and they cannot be extended to different multilevel topologies with a higher number of levels because of the table selection method adopted.Fig. 1. Schematic diagram of the new controlle
13、r.This paper describes a controller based on DTC that can be applied to different multilevel VSI topologies. It avoids the use of hysteresis comparators and look-up tables, and it does not require the knowledge of the motor model in the control system except for the inherent estimator as in the clas
14、sical DTC system.II. NEW CONTROLLERThe general structure of the new controller is shown in Fig. 1. This novel controller generates a reference stator voltage vector (us) in coordinates (us,us) according to the DTC basic principle, rather than using the VSI state look-up table as used in classical DT
15、C. This approach adopted is close to the DTC with space vector modulation scheme with closed-loop ux and torque control, and stator ux oriented control 4. More recently, other similar methods based on the predictive torque control concept have appeared 8 9.The inputs to the controller are the stator
16、 ux error (es),the torque error (ee) and, additionally, the stator ux angular speed (B),which is obtained to incorporate the back electromotive force (BEMF) term to improve the torque response at different operating points. The reference voltage vector calculated by the controller can be synthesized using different techniques with different degrees of
