The TU-RMVC series high-voltage frequency inverter adopts a series-connected multi-level scheme of power units and is a voltage source type. The frequency conversion system adopts speedless vector control technology, which has no special requirements for the motor and can be applied to ordinary AC motors and ordinary cables. The grid side uses multiple rectification technology, which is friendly to the grid, has basically no harmonic influence, and has a high power factor, reaching more than 0.95.