Intelligent Control Technology for Frequency Conversion Pump in Air Conditioning Systems

Abstract

Pump is main equipment in air conditioning systems and used widely, but its energy consumption is great. In order to improve energy efficiency, using pump controlled by frequency-conversion technology is an effective method. In this paper, the working principle and control method of variable frequency pump is described in detail, and gives a comparison between variable frequency control and traditional control about energy saving effect. Because traditional PID controller can be hard to get good control performance in pump control, this paper presents a control method using fuzzy logic controller to achieve frequency conversion and constant pressure water supply. The controlled variable is obtained by fuzzy control table. The system has energy-saving, security, and stable water pressure, etc. Simulation results show that the proposed controller not only have good robustness, but also have good dynamic and static performance.KeywordsPumpfrequency conversionenergy-savingfuzzy control