Pulse sequence predictive control of permanent magnet synchronous motor powered by three-phase four-switch inverter
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摘要: 针对单矢量预测控制方法存在控制自由度少、电流和转矩纹波大的问题，提出了一种三相四开关逆变器供电的永磁同步电动机脉冲序列预测控制方法。构造了两类包含3个电压空间矢量的对称型脉冲序列，利用电流参考值跟踪成本函数来选取优化脉冲序列；给出了电流参考值跟踪目标下的占空比计算公式，并通过调节直流分量对占空比进行补偿，从而实现直流母线电容电压平衡。仿真结果表明，该方法能实现电流参考值跟踪和母线电容电压平衡，有效减小了电流纹波和转矩脉动。Abstract: In view of problems of less control degree of freedom and large ripple of current and torque in single vector predictive control method, a pulse sequence predictive control method of permanent magnet synchronous motor powered by three-phase four-switch inverter was proposed. Two kinds of symmetrical pulse sequences with three voltage space vectors are constructed, and the optimal pulse sequence is selected by using cost function of current reference value tracking. Calculation formula of duty cycle under current reference value tracking target is given, and the duty cycle is compensated by adjusting DC component to achieve DC bus capacitor voltage balance. The simulation results show that the method can track current reference value and balance bus capacitor voltage, which effectively reduces current ripple and torque ripple.
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