The modular APF can filter out 2-50th harmonics, support multi-machine parallel operation, and the working mode can be set independently. It supports various network protocols (such as Modbus, UDP, etc.) and has been widely applied in the power supply and distribution systems of enterprises, commercial institutions, and government organizations. Its main applications include: power systems, petroleum, tobacco, chemical industry, metallurgy, pharmaceuticals, shipbuilding, automotive manufacturing, telecommunications, cement, mining, electrified railways, precision mechanical processing, welding, textile, printing, precision electronics, etc.