一种中高速区转矩优化的异步电机直接转矩控制算法

发布时间：2018-06-24 07:11

本文选题：直接转矩控制 + 异步电机　；参考：《中国电机工程学报》2016年01期

【摘要】：提出一种在异步电机基速内转矩性能优化的直接转矩控制(direct torque control,DTC)算法。该算法在中高速段采用连续定子磁链轨迹切换技术实现了各段定子磁链轨迹平滑切换。随着电机转子速度的升高,定子磁链轨迹依次从圆形、多边形及六边形连续与平滑地切换,算法具有电机转矩脉动小,电机转矩平稳等特点;在高速区段,给出一种非零电压矢量提前注入的控制方案,实现了减小转矩向下脉动,因此有效提高了转矩平均值与转矩平稳性。该DTC算法仅需在传统DTC结构中增加调节定子磁链和调节电压矢量作用时刻算法,既保留了传统DTC算法快速动态响应,以及对电机转子参数不敏感等特征,又确保控制系统较低的计算量要求。理论分析和实验结果都证明了该DTC算法的有效性和可行性。
[Abstract]:A direct torque control (DTC) algorithm is proposed to optimize the torque performance in the base speed of induction motor. The algorithm uses the continuous stator flux path switching technique to realize the smooth transition of stator flux locus in the middle and high speed section. With the increase of rotor speed, stator flux locus is switched from circle, polygon and hexagonal to smooth and continuously. The algorithm has the characteristics of low torque ripple and stable torque. A control scheme of non-zero voltage vector injection in advance is presented, which can reduce the downward ripple of torque and improve the torque mean value and torque stability effectively. This DTC algorithm only needs to add stator flux adjustment and voltage vector to the traditional DTC structure, which not only preserves the fast dynamic response of the traditional DTC algorithm, but also is insensitive to the rotor parameters of the motor. It also ensures that the control system requires lower computational requirements. Theoretical analysis and experimental results show the effectiveness and feasibility of the DTC algorithm.
【作者单位】：北京交通大学电气工程学院;西南交通大学电气工程学院;交通运输大学机械系;
【分类号】：TM343

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