摘要：The primitive controller used in the early version for HVAC systems, like the on-off (Bang- Bang) controller, is inefficient, inaccurate, instable, and suffers from high-level mechanical wear. On the other hand, other controllers like PID, compensator, and cascade controllers overcome these disadvantages but when an offset response (inaccurate response) occurs, power consumption will increase. In order to acquire better performance in the central air-conditioning system, a hybrid PIDcascade control is investigated in this paper and compared to the traditional PID, industrial PID (Ziegler- Nichols tuning) and compensator controllers in simulation and experiments. The output of the system is predicted through indoor and outdoor disturbances. Based on the mathematical model of air-conditioning space, the simulations in this paper have found that the proposed hybrid PID-cascade controller has the capability of self-adapting to system changes and results in faster response and better performance
关键词：PID; Lag and Lead compensators; Cascade control; HVAC system; Disturbance rejection;hybrid control.
