基于改进自适应动态规划的六相永磁同步电机矢量控制系统研究
发布时间：2018-08-13 21:26
【摘要】：智能控制理论正在经历蓬勃发展,快速学习的能力解放了繁杂的人为调试,对永磁同步电机智能控制系统的研究一直是领域内的热门。本文针对多相电机驱动系统的特点,提出一种效率高、反应灵敏、动态性能稳定的控制算法,并且将算法运用于六相电机矢量控制系统中。通过仿真结果看出该算法设计的控制器提高了控制系统的响应速度与精度,证明改进后的算法具有更强的适应性和鲁棒性。主要研究内容如下:(1)从结构分析相移电30°的六相永磁同步电机,包括在自然静止坐标系、α-β坐标系和d-q坐标系下的磁链方程、电压方程、转矩方程和运动方程。采用一种新式的坐标变换方法用于矢量解耦,重新构造适合在矢量控制系统中使用的断相运行状态下的电机模型。(2)主要以i_d=0原理构建六相永磁电机的空间矢量控制系统。分别研究了两矢量合成的两电平六相空间矢量调制策略和五矢量合成的三电平六相空间矢量调制策略。根据这些矢量在α-β和x-y平面的不同效果对冗杂的空间矢量进行精简,选择可以消除x-y平面谐波的五矢量作为基本合成矢量,达到合成参考电压矢量并消除5、7、17、19…次谐波电压的目的。为了解决三电平逆变器出现的中点电位偏移问题,对矢量作用顺序进行优化。(3)引入适应度方差因子对粒子群算法的权重系数更新进行优化,加快了收敛速度,避免迭代出现早熟现象;在保留3层网络之间的权值系数的基础上,增加了PID转移系数,优化了PID神经网络结构,使函数拟合能力更完善;对直接启发式动态规划进行了改进,根据优化PID神经网络搭建动作网络和评价网络,采用改进的粒子群算法对网络权值进行优化更新。改进算法避免了计算一阶导数,减小了计算量,优化了收敛性和鲁棒性(4)用改进的自适应动态规划算法设计速度、电流控制器,加入到六相永磁同步电机的矢量控制系统。自适应控制器根据反馈量与目标值的误差自发更新控制参数并输出控制信号,由三电平六相逆变器发出交流电完成对电机的调节。用传统自适应动态规划设计的控制器作为比较,实验结果证明改进算法有更好的灵敏性、动态特性和抗干扰能力。
[Abstract]:Intelligent control theory is undergoing vigorous development, the ability of rapid learning has liberated the complicated artificial debugging, and the research of PMSM intelligent control system has been a hot topic in the field. According to the characteristics of multiphase motor drive system, this paper presents a control algorithm with high efficiency, sensitive response and stable dynamic performance. The algorithm is applied to the vector control system of six-phase motor. The simulation results show that the controller designed by this algorithm improves the response speed and precision of the control system, and proves that the improved algorithm has stronger adaptability and robustness. The main contents are as follows: (1) the structure analysis of six-phase permanent magnet synchronous motor with phase shift of 30 掳includes flux equation, voltage equation, torque equation and motion equation in natural static coordinate system, 伪-尾 coordinate system and d-q coordinate system. A new coordinate transformation method is used for vector decoupling to reconstruct the motor model which is suitable for use in vector control system. (2) the space vector control system of six-phase permanent magnet motor is constructed based on i_d=0 principle. The two-level six-phase space vector modulation strategy and the three-level six-phase space vector modulation strategy are studied respectively. According to the different effects of these vectors in 伪-尾 and x-y planes, the jumbled space vectors are simplified, and five vectors which can eliminate the x-y plane harmonics are selected as the basic synthesis vectors to achieve the synthetic reference voltage vector and to eliminate the 5 ~ (-) ~ 71719 ~ (-) 鈥，
本文编号：2182236
[Abstract]:Intelligent control theory is undergoing vigorous development, the ability of rapid learning has liberated the complicated artificial debugging, and the research of PMSM intelligent control system has been a hot topic in the field. According to the characteristics of multiphase motor drive system, this paper presents a control algorithm with high efficiency, sensitive response and stable dynamic performance. The algorithm is applied to the vector control system of six-phase motor. The simulation results show that the controller designed by this algorithm improves the response speed and precision of the control system, and proves that the improved algorithm has stronger adaptability and robustness. The main contents are as follows: (1) the structure analysis of six-phase permanent magnet synchronous motor with phase shift of 30 掳includes flux equation, voltage equation, torque equation and motion equation in natural static coordinate system, 伪-尾 coordinate system and d-q coordinate system. A new coordinate transformation method is used for vector decoupling to reconstruct the motor model which is suitable for use in vector control system. (2) the space vector control system of six-phase permanent magnet motor is constructed based on i_d=0 principle. The two-level six-phase space vector modulation strategy and the three-level six-phase space vector modulation strategy are studied respectively. According to the different effects of these vectors in 伪-尾 and x-y planes, the jumbled space vectors are simplified, and five vectors which can eliminate the x-y plane harmonics are selected as the basic synthesis vectors to achieve the synthetic reference voltage vector and to eliminate the 5 ~ (-) ~ 71719 ~ (-) 鈥，
本文编号：2182236
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