Abstract: For air-conditioning systems having dynamics of large time-delay and inertia together with strong coupling between the regulation of temperature and relative humidity, and so on, a PID decoupling control system is proposed in this paper by synthesizing the air-conditioning processing and the technologies of PID and the decoupling control method. this PID decoupling control system for temperature and relative humidity in an air-conditioning room is configured and its numerical simulation is carried out via MATLAB software. The results show that the proposed PID decoupling control system using the PCTT matrix method is feasible in theory. Compared with the traditional multi-loop PID control system based on the Ziegler-Nichols setting method, for the temperature and relative humidity of the same plant, the proposed PID decoupling control system using the PCTT matrix method can eliminate the mutual influence existing in the adjustment channels between temperature and relative humidity and its control performance is better than that of the non-decoupling PID control system.

Key words: Air-conditioning system, temperature and humidity, PID controller, decoupling control, numerical simulation

摘要： 针对空调房间具有的较大时滞、较大惯性等动态特性，以及其温湿度调节通道之间存在强耦合效应的特点。综合空调工艺、PID和解耦的自动控制技术，本文提出了适用于空调房间的温湿度PID解耦控制系统。基于MATLAB对该温湿度PID解耦系统进行组态和数值仿真。结果表明，该温湿度PID解耦系统在理论上是可行的。对比温湿度PID无解耦控制系统和传统Ziegler-Nichols整定法下PID控制器，基于PCTT矩阵算法的温湿度PID解耦控制系统不但消除了温、湿度调节通道之间存在的相互影响，且其控制性能指标更好。

关键词: 空调系统, 温湿度, PID控制器, 解耦控制, 数值仿真