基于状态变量-多模型的主汽温控制系统

在现代火力发电厂控制中,锅炉出口过热蒸汽温度(主汽温)是锅炉的主要参数之一,对电厂的安全经济运行有着重大的影响。针对主汽温系统大惯性、非线性的特点,提出了基于状态变量-多模型的控制方案,即先采用状态反馈补偿主汽温的惯性,以PID作为控制器对补偿后的广义被控对象进行控制;再针对不同工况下对象特性的变化,对各工况控制子系统进行模态综合,实现大范围的控制。对主汽温系统的仿真结果表明,该方案可以较好地解决系统的大惯性和非线性问题。

Research of main steam temperature control system based on state variable and multi- model

In the modern thermal power plant,the superheated steam temperature is one of the main parameters of the boiler,which is very important for unit's safety.Aiming at the characteristics of large inertia and non-linearity,the main steam temperature system is controlled using state variable and multi-model.State feedback is used to compensate the large inertia.Then the compensated generalized plant is controlled by PID controllers.The feature parameters of main steam temperature system are different in different operation conditions,so the multi-model control is put forward for the realization of wide range control.The simulation results show that the control method proposed is an effective control strategy for the main steam temperature system with large inertia and non-linearity.