板形设定模型参数优化与控制技术应用

 板形设定模型是整个板形自动控制系统中非常重要的一部分，决定着带钢头部板形的控制精度。板形精度既为热轧带钢的一项重要质量指标，又为衡量产品市场竞争力的主要因素。板形控制是带钢热轧的核心技术，为目前轧制技术研究开发的热点。阐述了鞍钢1780线PC轧机板形设定模型功能和构成，对轧辊热凸度模型参数进行了优化，在模型自学习中对各机架给予适量的平直度及凸度反馈，从而提高了板形设定模型精度。由于实际轧制过程的非线性、时变性，传统PID的控制已近极限，为进一步提高控制品质，板带平直度反馈采用非线性PID控制策略，其参数整定范围较宽，易于工程实现。通过对现场大量的轧制数据统计，在应用模型参数优化程序后，热轧板的平直度与凸度的头部命中率有了一定的提高。

Parameter optimization of shape setting model and application of control technology

The shape set model is a very important part of the automatic shape control system，and it determines the accuracy of strip head profile and flatness. The shape precision is not only an important quality index in the hot strip rolling，but also decides the market competitiveness of the product. The shape control strategy has been a core technology in the hot strip mill，which is a hot topic for rolling research. The structure and function of the PC shape set control system are described about 1780ASP，whose parameters of hot roller crown model have been optimized. The feedback of the strip crown and flatness is introduced in model self-learning for standers，which can effectively improve the accuracy of the shape set model. Due to the non-linearity and time-varying of the practical rolling process，the traditional PID control is close to the limit. In order to further improve the control quality，the flatness feedback of the strip adopts the nonlinear PID control strategy，which has a wide range of parameters tuning and is easy to realize in engineering. The production data has shown that the shape control precision was improved after application of the optimization program.