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本文首先论述了变频技术在高精度恒温恒湿空调机中应用的可行性,设计并制造了实验样机。而后提出了一种新型的分阶段电子膨胀阀—变频压缩机同步自适应PID控制方式,阐述了其控制原理,并成功应用于实验样机中。最后通过实验研究了变频恒温恒湿空调机温湿度控制精度特性,结果表明:变频恒温恒湿空调机无论是在恒定热湿负荷下还是热湿负荷阶跃干扰下,均能实现室内环境温度控制精度±0.5℃以内,相对湿度控制精度±3%以内,并能够长时间稳定运行。同时,通过实验论证了分阶段电子膨胀阀—变频压缩机同步自适应PID控制方式能够很好地缓解控制上的延迟和超调现象。
This paper first discusses the feasibility of frequency conversion technology in high-precision constant temperature and humidity air conditioners, design and manufacture of experimental prototype. Then a new type of phased electronic expansion valve - frequency conversion compressor synchronization adaptive PID control mode is presented, its control principle is expounded and successfully applied in the experimental prototype. Finally, the temperature and humidity control precision characteristics of the frequency conversion constant temperature and humidity air conditioner are experimentally studied. The results show that the temperature and humidity control of the frequency conversion constant temperature and humidity air conditioner can realize the control of the indoor environment temperature, whether under the constant heat and moisture load or the step load and heat load. Accuracy within ± 0.5 ℃, relative humidity control accuracy within ± 3%, and can be a long time stable operation. At the same time, the experiment proves that the phased electronic expansion valve - inverter compressor synchronous adaptive PID control method can well control the delay and overshoot phenomenon.