Design and simulation of energy saving control for central air-conditioning system based on improved PI control.

People's needs for environmental temperature are becoming more stringent as social living standards rise. At present, the research of central air conditioning control strategy is still under development. Classical control methods, such as PI control and switch control, are widely used because of their simple principle, but they still face many problems, such as low control precision and poor anti-interference. Most of the designs simplify the control by linearizing the actual state change, resulting in the loss of many nonlinear features and the failure to achieve the desired control result. In response to the characteristics of nonlinearity, hysteresis, and difficulty in establishing accurate models in the central air conditioning system, combined with the advantages of PI control and fuzzy control, a fuzzy PI controller is intended to fulfill the control goals of maintaining a steady temperature. The simulation results demonstrate that the control strategy runs steadily satisfies the requirements for target precision, and has good energy-saving effects. At the same time, the design and simulation have further significance for future research on more detailed and more targeted real-time centralized control methods for a large number of users of central air-conditioning loads. [ABSTRACT FROM AUTHOR]