異步電機(jī)電流模型預(yù)測控制技術(shù)研究
[Abstract]:The model predictive control (MPC) algorithm is considered to be one of the new generation of high performance control strategies in the field of motor control after vector control and direct torque control because of its strong stability, simple thinking, fast dynamic response and easy handling of nonlinear constraints. In this paper, the theory of model predictive control is introduced in the field oriented control, and the control principle and control performance of current model predictive control for asynchronous motor are studied deeply. The feasibility and effectiveness of the control strategy are verified by simulation and experiments. Then, based on the basic principle of model prediction, three basic steps of predictive control are given, and the current prediction model in rotating coordinate system is established based on mathematical model and state equation of asynchronous motor. The basic framework of current model predictive control based on flux orientation strategy is constructed, and an improved optimization method based on discrete filter is introduced to the rotor flux observer for induction motor. By setting appropriate cutoff frequency and compensation measures, the problems of integral saturation and DC bias are solved, and the precision of flux observation in predictive control is improved. In addition, for the control process of single-step current model predictive control, the problem of divergence and oscillation caused by single-step current model predictive control algorithm is solved by linear fitting of the future current trajectory. Aiming at the problem of one-beat delay in current predictive control, the compensation strategy of one-beat delay is put forward to improve the adverse effect caused by one-beat delay, and the problem of high average switching frequency under predictive control is also proposed. Double boundary circle limiting strategy is introduced to reduce the number of switching operations, and the error prediction strategy is introduced to maintain the current error below the error limit in the current predictive control at low sampling frequency. To solve the problem of high sampling frequency of predictive control, the idea of double vector current model predictive control is introduced. In order to verify the theoretical analysis effect of current model predictive control, the MATLAB model is built to simulate and verify the dynamic response speed of the motor under the current model predictive control, and the correctness of the theoretical basis of current model prediction is verified. The control performance of error prediction strategy and one-beat delay compensation algorithm is tested, and the control effects of single-vector predictive control and double-vector predictive control are compared. At the same time, the hardware and software platform of the current model predictive control experiment system for asynchronous motor is built. The experimental results also verify the effectiveness of the proposed current model predictive control strategy.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM343
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