电弧炉电极调节智能控制系统研究

Intelligent adjustment control of electric arc furnace electrode

针对旧式电弧炉在生产过程中存在的故障率高、控制差等诸多问题,结合电极调节特点和冶炼工艺要求,依据电弧电流和弧长的关系,建立电极调节智能控制模型。在熔化期采用Bang-Bang快速最优控制提高电极快速响应性能,给出了Bang-Bang控制算法的实现方法;在氧化期和还原期采用模糊算法在线自动调整PID控制器参数来提高控制精度,依据工程实际,建立PID控制器参数自动调整模糊控制规则。结果表明,系统参数变化具有良好的适应性,并有效地减少了电极短路、断弧等现象。

Since the old -style electric arc furnace had so many drawbacks in the production processes such as high failure rate, low controllability, etc, based on the relationship of the arc current and the length, an intelligent control model of the electrode adjustment was built according to the characteristics of the electrode adjustment and the requirement of the smelting technics. High speed and optimal control based on the Bang - Bang theory was used in the fusion period to improve the electrode＇s responsive performance. The implemental proposal of the bang - bang control algorithmic method was given, while during the period of oxidization and deoxygenization the fuzzy algorithmic method was used to automatically adjust the PID controller＇ s parameters on line. Thus control accuracy was achieved. This model fuzzy control rules, which could automatically adjust the PID controller＇ s parameters, was established according to the project practice. The results indicate that control system is a favorable adjustability to the parameter change, which can effectively reduce short circuit and current interruption in turn.