电力传动系统的转矩控制器优化设计与实现

Optimization design and implementation of torque controller for power transmission system

恶劣环境下的电力传动系统中的转速传感器会出现故障,导致在低速运行情况下受到低开关频率限制,此时采用传统直接转矩控制系统,从单点出发搜索最佳电机参数控制点,存在较高的转矩脉动。因此,提出基于改进遗传禁忌算法设计的转矩控制器,该控制器通过基于DSP的转矩控制系统控制电机的转矩以及转速和转角,基于改进遗传禁忌算法控制方案给出转矩控制指令,实现电力传动系统转矩的精确控制。速度调控器采用改进遗传禁忌算法的PID控制器,完善电力传动系统的转矩控制性能。将禁忌搜索方法当成遗传算法的变异算子,避免电力传动转矩控制系统中PID速度调控器出现超调问题,使得低速运行情况下转矩控制器保持平稳的转矩脉动,增强电力传动系统的稳定性。实验结果说明,该方法能够有效优化电力传动系统的转矩性能,获取平稳的转矩波形。

The rotating speed sensor of power transmission system may cause failure under severe environment,so the system may be limited by the low switching frequency at low running speed. For this problem,the traditional direct torque control system has high torque ripple due to the search of optimum motor parameters by means of single point. Therefore,the torque controller based on improved genetic tabu algorithm is proposed,which can control the motor torque,rotational speed and angle through the torque control system based on DSP. The torque control instruction is given based on the control scheme of the improved genetic tabu algorithm to realize the accurate torque control of the power transmission system. The PID controller based on the improved genetic tabu algorithm is adopted in the speed controller to improve the torque control performance of the power transmission system. The tabu searching method is used as the mutation operator of genetic algorithm to avoid the overshoot problem existing in PID speed controller of the power transmission torque control system,make the torque controller have stable torque ripple at low running speed,and improve the stability of the power transmission system. The experimental results show that the method can effectively optimize the torque performance of the power transmission system,and obtain the smooth torque waveform.