Controlling inverters as flux linkage sources: Unifying operating mechanisms of power electronics inverters and AC machineries

This paper proposes to control power electronics inverters as flux linkage sources. The concept of flux linkage source is expected to unify the operating mechanisms of inverters and typical AC machineries, such as synchronous generators (SGs) and AC transformers, which are essentially flux linkage sources. A capacitor voltage synchronizing (CVS) scheme-based flux linkage controller is designed for automatic synchronization and load-sharing of flux linkage source inverters. Electromagnetic simulations have validated that the flux linkage source inverter is more capable of recovering from large disturbances than the voltage source and current source inverters. The flux linkage source inverter can operate with both weak and strong grids. Meanwhile, it shows extra benefits in aspects of inrush current limitation and DC component regulation. The flux linkage source inverter offers a unique and promising alternative for connecting renewable power and forming AC power grids with a high percentage of power electronics sources.