基于轉子磁鏈q軸分量的異步電機轉子電阻校正策略
[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.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TM343
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