The high-voltage variable frequency drive we usually call, the input power supply voltage is generally above 3kV, which is a high-power VFD. There are many types of VFDs, and the classification methods are not the same. The three basic classifications of high-voltage VFDs are listed below, with an introduction to each type of VFD.

VFDs have relatively complete protection functions, and can realize various control and closed-loop regulation after cooperation with other intelligent equipment (PLC, DCS). In practical applications, avoiding risks and using them reasonably are the keys to improving the efficiency and service life of the inverter.

We usually refer to the device that converts alternating current with constant voltage and frequency into alternating current with variable voltage or frequency as "frequency inverter". A frequency inverter can also be defined as follows: VFD (Variable-frequency Drive) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply.