卫星单相流体回路热控系统前馈PID控制

Feed Forward PID Control of Satellite Single-phase Fluid Loop Thermal Control System

利用传热学相关理论,对卫星单相流体回路热控系统的传热机理进行了分析与简化,建立起一个包括卫星单相流体回路各热组件模型、受控对象模型与控制系统模型的系统动态热模型。针对卫星单相流体回路系统惯性比较大,温度经常超调的特点,提出在现有PID反馈控制的基础上,引入系统热负荷作为反映系统扰动信号的前馈控制,以减少系统温度的动态偏差。利用热力学模型进行了仿真研究,仿真结果表明:采用以"系统热负荷"为信号的前馈PID控制温度超调量更小,具有更好的控制性能。仿真结果也可用于指导工程设计。

The transfer mechanism of satellite single-phase fluid loop thermal control system was analyzed and simplified. A transient thermal model including thermal modules model, controlled-object model, and control system model was developed. Aiming at the reduction of the temperature dynamic deviation caused by the larger inertia of satellite single-phase fluid loop, the heat load was taken as a feed forward control disturbance signal of satellite single-phase fluid loop on the basis of current PID control. Simulation results indicate that the feed forward PID control strategy has less disadvantage and better performance. The results can also instruct the engineering design.