Induction converters: PLL-less converters with induction machines characteristics

This paper presents a new control strategy called induction converter for integration of voltage source converters (VSCs) in smart power grids such that grid senses VSC as a virtual induction machine by proper adjustment. In this sense, related filter and line impedance is modeled as virtual stator of an induction machine and the VSC and the VSC and associated dc-link mimic mechanical and electrical behavior of rotor of induction machine through control algorithms. The controller has fast response with single loop and has only current sensors. The controller provides self- and soft-start with a grid with unknown frequency and voltage amplitude without the need for a phase-locked-loop (PLL) and synchronization unit similar to induction machines which can significantly reduce computation burden and improve system stability. Beside elimination of PLL, the controller offers emulated inertia which enhances system frequency regulation and stability. This paper beside synchronous converters realizes the control platform for integration of VSCs to future smart power systems.