Regelung der doppelt gespeisten Drehstromasynchronmaschine mit Multilevel-Matrixumrichter für einen Schwungradspeicher zur Sicherung der Momentanreserve in trägheitsarmen Netzen

The operating mode and control of an Asynchronous Rotating Energy System Stabilizer (ARESS) are presented, consisting of a doubly-fed asynchronous slipring machine which can be operated at rotor speeds above and below synchronous speed using a multilevel matrix converter. By decoupling the speed from the grid frequency, it is capable of converting a larger stored kinetic energy into active power relatively to comparable fixed-speed generators when the grid frequency drops. Thus, one of the main purposes of the system is to contribute to the momentary reserve of the grid. The control of the system using a rotor-side matrix converter also allows for time-staggered dosing of active power and voltage-dependent reactive power operation. Particularly high demands on the control arise in grid services in weak grids, simultaneous voltage support, as well as symmetrical and asymmetrical fault cases, whose design, optimization, and verification are discussed in the paper using a low-power demonstrator.