PLC变频调速的网络反馈系统的实现_外文翻译.doc

毕业设计（外文翻译） 英文题目 Realization of Neural Network 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 2009022221 指导教师 李思光 职 称 讲 师 二〇一三 年六月 Realization of Neural Network 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 neural network inverse system and combining it with the variable frequency speed-regulating system, a pseudo-linear system is completed, and then a linear close-loop adjustor is designed to get high performance. Using PLC, a neural network 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 neural network 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 i