PLC变频调速的网络反馈系统的实现外文翻译(定稿).doc

毕业设计(外文翻译)
英文题目 Realization of work Inverse
System with PLC in Variable
Frequency Speed-Regulating System
中文题目 PLC变频调速的网络反馈系统的实现
系(院) 自动化系
专业电气工程与自动化
学生姓名 00
学号
指导教师李思光
职称讲师
二〇一三年六月
Realization of work Inverse System with PLC in Variable Frequency Speed-Regulating System
The variable frequency speed-regulating system which consists of an induction motor and a general inverter, and controlled by PLC is widely used in industrial field. However, for the multivariable, nonlinear and strongly coupled induction motor, the control performance is not good enough to meet the needs of speed-regulating. The mathematic model of the variable frequency speed-regulating system in vector control mode is presented and its reversibility has been proved. By constructing a work inverse system bining it with the variable frequency speed-regulating system, a pseudo-linear system pleted, and then a linear close-loop adjustor is designed to get high performance. Using PLC, a work inverse system can be realized in actural system. The results of experiments have shown that the performances of variable frequency speed-regulating system can be improved greatly and the practicability of work inverse control was testified.
1. Introduction
In recent years, with power electronic technology, microelectronic technology and modern control theory infiltrating into AC electric driving system, inverters have been widely used in speed-regulating of AC motor. The variable frequency speed-regulating system which consists of an induction motor and a general inverter is used to take the place of DC speed-regulating system. Because of terrible environment and severe disturbance in industrial field, the choice of controller is an important problem. work inverse control was realized by using industrial puter and several data acquisition cards. The advantages of industrial puter are putation speed, great memory capacity and patibility with other software etc. But industrial puter also has