燃气机热泵变容量调节过热度控制

过热度控制是燃气机热泵系统高效、安全、稳定运行的基础．针对燃气机热泵启动、正常运行工况下的过热度控制策略及燃气机变转速对过热度控制效果的影响进行了研究，提出一种新的基于启动阶段采用前馈．模糊自适应PID和正常运行阶段采用模糊自适应PID实现燃气机热泵过热度控制的控制策略，并将其应用到燃气机热泵实验系统中．实验结果表明：燃气机热泵系统启动阶段过热度最大超调量小于5℃，调整时间为300s左右；正常运行阶段，燃气燃气机转速大范围改变时，模糊自适应PID控制效果优于增益调度控制，高转速时过热度的控制效果明显优于低转速；模糊自适应PID应用于燃气机热泵系统可有效克服系统干扰，提高控制质量．

Superheat Control of Gas Engine-Driven Heat Pump for Variable Capacity

Superheat control is the critical factor for a gas engine-driven heat pump to operate in an efficient, safe and stable state. This paper aimed to study the superheat control strategy of the gas engine-driven heat pump running in start-up and normal operating stage, and the impact of the engine speed on the effect of the superheat control was also studied. In the experimental process, the feedforward-fuzzy self-adaptive PID for the start-up stage and fuzzy self- adaptive PID for the normal operating stage were adopted to control the superheat of gas engine-driven heat pump. The results show that during the start-up stage, the maximum overshoot of superheat is less than 5℃ and adjusting time is 300 s or so; In normal operating stage, the fuzzy self-adaptive PID is superior to gain scheduling control when the engine speed changes in a large scale and the superheat control effect is better when the engine runs at a higher speed than at a lower speed; fuzzy self-adaptive PID used in gas engine-driven heat pump system can effectively over- come the system interference and improve control quality.