三相逆变器的随机双PID组合优化方法

Combinatorial optimization control strategy for a three-phase inverter with random double PID

针对永磁同步电机控制系统中电流脉动和开关损耗的问题,提出了一种三相逆变器的基于随机双PID控制器的开关组合优化控制策略。首先,为了解决控制器参数选择困难的问题,设计了缩小控制器参数范围、标识满足控制性能参数的随机算法对传统的双PID控制器进行参数选择。然后,依据最优控制理论,提出了一种使得三相逆变器输出的电压矢量跟踪双PID控制器输出的期望电压矢量的开关组合优化控制策略。最后,与传统PWM方法的对比实验结果表明,开关组合优化控制策略的电流跟踪误差平均值减小了1.09%,均方差减小了25.28%,开关转换次数减小了4.65%,从而验证了控制策略的有效性。

Aiming at the problems of current fluctuation and switch losses in permanent magnet synchronous motor control system,a switch combinatorial optimization control strategy was proposed based on random double PID controllers for a three-phase inverter.Firstly,in order to solve the problem of parameter selection,a random algorithm was designed to reduce the parameter range of controller and identify the parameter satisfying control performance.Then,based on the optimal control theory,a switch combination optimization control strategy was proposed to make the output voltage vector from the three-phase inverter tracking the expected voltage vector from the double PID controller.Finally,compared with the traditional PWM method,the experimental results show that the average value of the current tracking errors for the switch combination optimization control strategy is reduced by 1.09%,and the mean square error is reduced by 25.28%and the number of switching transitions is reduced by 4.65%,which verifies the effectiveness of the strategy.