基于转子磁链q轴分量的异步电机转子电阻校正策略

发布时间：2019-06-16 12:55

【摘要】：当前,高铁与轨道交通正处于飞速发展期,对牵引变流器的控制性能提出了越来越高的要求。矢量控制技术以其控制简易、动静态性能优越等优势在机车牵引领域有广泛的应用,但是磁场定向容易受电机参数变化,尤其是转子电阻变化的影响。本文在校企联合牵引变流器项目的基础上,对矢量控制算法中的转子电阻校正策略进行了研究。文章介绍了当前常见的转子磁链观测器的类型,并分析了各自的优缺点。分析了异步电机在A、B、C坐标系与d、q坐标系下的数学模型,以及在不同坐标系之间的变换矩阵。文章分析了转子磁链q轴分量与磁场定向准确度的关系,然后基于这一点,研究了电流矢量定向坐标系下转子磁链q轴分量观测法和带幅值相位校正的电压模型转子磁链q轴分量观测法,并用观测到的rq?来校正转子电阻。详细分析了两种策略的观测原理,并且通过仿真验证了校正的正确性。文章研究了一种新的基于转子磁链q轴分量的转子电阻校正策略,对策略进行了详细的理论分析,用仿真验证了算法的准确性。分析了在样机运行时观测延时对校正算法的影响,并且对延时进行了补偿。最后,在3k W样机上,对校正策略进行验证,记录了相关波形,实验结果证明该校正策略是有效的。
[Abstract]:At present, high-speed rail and rail transit are in a period of rapid development, which puts forward higher and higher requirements for the control performance of traction converter. Vector control technology has been widely used in the field of locomotive traction because of its simple control and superior dynamic and static performance, but the magnetic field orientation is easily affected by the change of motor parameters, especially the change of rotor resistance. Based on the project of joint traction converter between school and enterprise, the rotor resistance correction strategy in vector control algorithm is studied in this paper. In this paper, the types of rotor flux observer are introduced, and their advantages and disadvantages are analyzed. The mathematical model of asynchronous motor in A, B, C coordinate system and d, Q coordinate system, as well as the transformation matrix between different coordinate systems are analyzed. In this paper, the relationship between the Q axis component of rotor flux chain and the accuracy of magnetic field orientation is analyzed. Based on this, the Q axis component observation method of rotor flux chain in current vector oriented coordinate system and the voltage model rotor flux Q axis component observation method with amplitude and phase correction are studied, and the observed rq? is used. To correct the rotor resistance. The observation principles of the two strategies are analyzed in detail, and the correctness of the correction is verified by simulation. In this paper, a new rotor resistance correction strategy based on Q-axis component of rotor flux is studied, the strategy is analyzed in detail, and the accuracy of the algorithm is verified by simulation. The influence of observation delay on correction algorithm while the prototype is running is analyzed, and the delay is compensated. Finally, the correction strategy is verified on the 3kW prototype, and the related waveforms are recorded. The experimental results show that the correction strategy is effective.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM343

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