直流式蒸汽发生器压力控制仿真

Pressure control simulation for once-through steam generators

基于对直流式蒸汽发生器的热工和水力特性的分析和质量、能量、体积三大守恒定律,建立了直流式蒸汽发生器压力控制数学模型,并采用PID控制器构建了直流式蒸汽发生器压力串级控制系统,对所建模型进行了仿真验证。结果表明:二回路给水流量和出口蒸汽流量对直流式蒸汽发生器压力的影响较一回路传热量更大;无扰动和扰动工况下,控制系统均能够在400s内使直流式蒸汽发生器压力稳定至设定值,且最大压力超调量均小于5%;直流式蒸汽发生器压力动态数学模型能够较好地表征一回路冷却剂温度、二回路给水流量及出口蒸汽流量与蒸汽发生器压力的关系;直流式蒸汽发生器压力串级控制系统响应速度快,超调量小,具有较强的鲁棒性和抗干扰能力。

Based on the thermodynamic and hydraulic analysis of once-through steam generators and the certain volume of once-through steam generators,the law of conservation of energy and the law of conservation of mass,this paper established pressure control model for once-through steam generators.Moreover,through setting up the pressure once-through steam generator control simulation system using PID controller,this paper verified the model.The results show that,the effects of feed water flow and steam flow in secondary loop on the pressure inside the once-through steam generator were greater than that of the heat transfer of the primary loop.Regardless of non-disturbance or disturbing condition,the control system could make the pressure inside the once-through steam generator reach and stabilize at the set value within400 s,and the maximum overshoot was less than 5%.The pressure dynamic mathematical model of the once-through steam generator could reflect the relationship between the primary coolant temperature,feed water flow,steam flow and the pressure.The pressure cascade control system of the once-through steam generator has fast response speed,small overshoot,strong robustness and anti-interference ability.