BP网络智能PID控制算法在交流调速系统中的应用

Research and application of intelligent PID algorithm based on BP network

针对交流异步电动机存在的非线性、多变量、强耦合及模型结构不确定的特点,设计以西门子S7-300 PLC为控制单元、以研华IPC-610工业控制计算机为监视操作单元的基于PROFI-BUS-DP的交流调速控制系统。通过对被控对象特性的分析,将神经网络技术与PID控制结合,研制了基于BP网络的PID控制算法,并用PLC语言给予实现。该算法既有神经网络控制良好的动态特性又保持了PID控制的高速稳定性。实际应用结果表明:系统调速特性好,控制精度高,具有一定的推广价值。

In view of the characteristics of nonlinear, multi-variable, strong coupling and uncertain model structure for the AC induction motor, an AC variable speed control system is designed based on PROFI- BUS-DP network, which adopts Siemens S7-300 PLC as control unit and Yanhua IPC-610 industrial computer as monitoring unit. After analysing of the plant properties, a self-tuning algorithm with neutral network （NN） and proportional integral derivative （PID） is proposed and then is implemented by PLC. It inherits the excellent dynamic characteristics of NN technique and the high-speed stability of PID algorithm at the same time. The experimental results prove its effectiveness. The proposed control algorithm presents good dynamic performance, outstanding adaptability, and high controlling accuracy.