基于雙滑模的永磁同步電機(jī)無傳感器控制研究
[Abstract]:The structure of permanent magnet synchronous motor (7) PMSM (8) is simple and can work reliably for a long time, which makes it widely used in various fields. PMSM speed control system has some uncertain factors, such as internal parameter perturbation and external disturbance. In order to realize the high performance control of PMSM, the research of PMSM control method is urgently needed. In order to improve the robustness of PMSM control system and improve the performance of speed regulating system, a PMSM control system based on double sliding mode control strategy is proposed in this paper. The sliding mode speed controller and the sliding mode position observer are designed respectively. Replace Pi controller and mechanical position sensor in traditional PMSM control system. In the design of sliding mode speed controller, in order to improve the dynamic quality, the approach based on approach law is adopted in this paper. Based on the analysis of the causes of buffeting in constant velocity approach law, a new sliding mode velocity controller with variable exponential approach law with time-varying switching gain is designed. In this method, the time-varying coefficient is added to the constant velocity term of the approach law to form the time-varying switching gain, and the power function of the state variable is introduced into the exponential term to accelerate the approach speed. The contradiction that the constant velocity approach law can not take into account the rapidity and weaken the chattering of the system is solved. The dynamic performance of the system is improved and the performance of the controller is improved. Sliding mode observer can measure the voltage and current of PMSM to obtain the information of rotor position and speed, but the high frequency noise and ripple in the observation of back EMF will directly affect the estimation accuracy. Therefore, a series of improvements have been made to the traditional sliding mode observer, including the design of low-pass filter with variable cutoff frequency with varying cutoff frequency by using saturation function. The modified sliding mode observer can reduce buffeting obviously by introducing Kalman filter to smoothing back EMF and extracting rotor position and rotational speed information by phase-locked loop (PLL). The interference caused by the measurement error and the system error is effectively suppressed, and more smooth back EMF information is obtained, which makes the estimation information more accurate and the system performance improved to a large extent. Finally, according to the control method designed in this paper, the simulation of PMSM speed control system is completed in MATLAB/simulink software. At the same time, the experimental platform of PMSM control system based on STM32F103 chip is built, and the software design of the system is completed. The simulation and experimental results show that the proposed control strategy is effective and achieves the expected results.
【學(xué)位授予單位】:遼寧工程技術(shù)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM341
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