Author(s)

Geng Lishan

Corresponding Author

Geng Lishan

Abstract

With the increasingly severe global energy crisis and environmental issues, the air conditioning industry has become more demanding in controlling electricity consumption. However, existing central air conditioning (CAC) systems generally suffer from high energy consumption. The frequency converter control system, as an advanced electrical equipment control technology, has been widely used in various types of equipment to achieve real-time automation control. However, the current frequency conversion control system still has shortcomings in accurately controlling energy consumption in various frequency bands, resulting in prominent energy waste caused by factors such as resistive loads. This article proposes a variable frequency control system for CAC refrigeration system based on programmable logic controller (PLC) technology to address the above issues. This system explores the software and hardware design as well as parameter optimization from two core perspectives: PLC program design and frequency converter control. Through careful system debugging, we have successfully achieved the green and energy-saving function of the system. This system can accurately control the energy consumption of each frequency band, effectively reducing energy waste caused by factors such as resistance load, thereby significantly improving the energy efficiency ratio of the CAC system.

Keywords

PLC Technology; Central Air-Conditioning; Refrigeration System; Variable Frequency Control System