With the rapid development of science and technology, especially the high development and application of power electronic technology, microelectronic technology and automatic control technology, the energy-saving effect of the inverter is more clear. Since then, it has always worked efficiently, has good static characteristics, and can achieve high efficiency, high reliability, and high precision automatic control related to other speed regulation methods (such as: step-down speed regulation, pole change speed regulation, slip regulation speed, the same cascade speed regulation, etc.) have greater advantages, the frequency conversion speed regulation is not rigid, the speed regulation range is wide, and the efficiency is high.

The application of PLC in nitrogen generator equipment. In the current industrial crisis, air compressors are widely used in metallurgical machinery manufacturing, mining, electric power, textile, petrochemical, light textile and other industries. Most of the traditional air compressor air supply control methods are to use loading and unloading control methods. Although the control method is disordered in principle and easy to operate, it has many effects such as high energy consumption, easy damage to the intake valve, and not strong air supply pressure.