Einsatz der Virtuellen Synchronmaschine (VISMA) als Unterbrechungsfreie Stromversorgung im Netzparallel- und Inselnetzbetrieb (Volume 86) (English shop)

Preview

Extract, PDF (280 KB)
Table of Contents, PDF (110 KB)

In this work, the author describes and compares the behaviour of two grid-forming converter concepts, the Virtual Synchronous Machine (VISMA) and the Voltage Controlled Inverter (VCI), under various grid conditions and illustrates their potential contribution to the system stability of future power grids.

The focus lies on grid-supportive behaviour for frequency and voltage control through the instantaneous provision of inertial reserve, as well as frequency support by means of primary control and reactive-power-dependent voltage control.

Grid formation is the core topic in islanded operation, under the conditions of using the identical control scheme as in grid-parallel operation and of being able to integrate further generation units without additional communication.

In addition, the fault cases of grid outage, short interruptions and short circuits are examined.

In order not only to continue supplying a load in the manner of a UPS system, but also to protect it against grid-side faults, a short-circuit control scheme is developed for the VISMA which can protect the load from a complete voltage interruption until the grid fault is cleared.

The author thus demonstrates a novel way in which the VISMA can extend its field of application without losing its positive grid-supportive properties for system stability.

This work can therefore contribute to increasing security of supply through novel equipment in the future grid with a high share of grid-forming converters.