无差拍空间矢量调制直接转矩控制简化设计

Simplified Design of Deadbeat Direct Torque Control Based on Space Vector Modulation

提出一种对无差拍空间矢量调制直接转矩控制的简化结构,主要通过预先选取定子静止两相坐标系下参考电压矢量,并实时计算该电压矢量减小转矩误差所需的脉宽。该结构较之于原有系统,避免了特殊情况下多次逻辑判断和反复求解一元二次方程以确立定子参考电压矢量的弊端,控制过程得到极大简化,结构更为简单、动态响应更为迅速。与传统开关表直接转矩控制相比,开关利用率得以提高,实现了对转矩的精确控制。理论和实验结果表明,采用所提出的控制方法,控制性能得到较大提高。

A reduced structure of deatbeat direct torque control based on space vector modulation（SVM-DTC）is proposed in this paper.The main ideal is choosing the reference voltage vector in two phase stator reference frame previously and real-time calculating the pulse width of the reference voltage vector which diminish the error of torque.The improved structure not have to frequently logical judge and repeatedly solve a quadratic equation in extraordinary case.It has a higher dynamic response ability by contrast with the SVM-DTC and greatly improve the switching frequency and adjusting the torque more accurately in comparison with the classical DTC.The theoretical analysis and experimental results show that the proposed method retains the advantages of conciseness in classic DTC and improves the control performance.