预测控制在直流电机调速系统中的应用

论文总字数：19521字

目 录

1 直流电机调速的背景和意义……………………………………………4

1.1无刷直流电动机的控制策略……………………………………………4

1.1.1最优控制………………………………………………………5

1.1.2智能控制………………………………………………………5

1.2预测控制的发展………………………………………………………6

1.2.1预测控制的类型…………………………………………………6

1.2.2预测控制在实际应用中的发展 ……………………………………7

1.3本文研究的主要内容 …………………………………………………7

1.4本文的组织结构………………………………………………………7

2 无刷直流电动机控制系统

2.1无刷直流电动机调速结构………………………………………………8

2.2无刷直流电机的运行原理………………………………………………9

2.2.1无刷直流电机的换相 ……………………………………………9

2.2.2无刷直流电机的驱动方式 ………………………………………11

2.3无刷直流电机的数学模型 ……………………………………………11

2.4本章小结……………………………………………………………13

3 无刷直流电机调速控制策略

3.1 PID控制算法 ………………………………………………………14

3.3 预测函数控制 ………………………………………………………16

4 Matlab仿真

4.1无刷直流电机调速系统 ………………………………………………22

4.2 PI、PFC、PI预测函数控制仿真 ………………………………………23

4.2.1双环的控制器参数 ……………………………………………23

4,2.2仿真结果分析 …………………………………………………23

4.4本章小结……………………………………………………………29

结论与讨论 ………………………………………………………………31参考文献 …………………………………………………………………33

致谢 ………………………………………………………………………35

预测控制在直流电机调速系统中的应用

赵阳

，China

Abstract:Brushless DC motor has some advantages, such as small volume, high efficiency, low noise, low inertia, high reliability and high control precision. It also has the advantages of comparable speed regulation performance of DC motor, simple structure of AC motor, reliable operation and so on. With the rapid development of computer technology and power electronics technology, the control performance of industrial servomotor to motor has been improved, and the control of brushless DC motor has great research value.

On the basis of analyzing the working principle of brushless DC motor and the simulation analysis of the basic speed control algorithm Pi, fractional PIand predictive function control, this paper analyzes and compares the control effect of predictive function and traditional Pi and fractional Pi. And pointed out their respective shortcomings, put forward some improvements to make up for the deficiencies. In order to find a better control algorithm, combining the advantages of Pi,and predictive function, two improved control algorithms are proposed: Pi Predictive Control algorithm (PIPFCalgorithm).

Because the predictive function control is based on the mathematical model of the controlled object, it is necessary to get the mathematical model of the actual controlled object. The theoretical modeling can only get the mathematical model of the motor theory according to the parameters of the motor, and the actual model of the inverter can not be ignored, so the theoretical modeling can not get a satisfactory mathematical model. So the ARMAX model is introduced to facilitate and identify.

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