In this paper the approach to test a real hardware Virtual Synchronous Generator (VSG) is presented. The purpose of a VSG is to substitute the rotational inertia of synchronous generators. The development of such a device starts in a pure simulation environment and extends to the practical realization of a VSG. Testing a real hardware VSG is a complicated matter since its place is within a power system. However, by replacing the power system with a real time simulated one, this complexity is reduced. The VSG then interacts with the simulation through a power interface. The advantages of such a laboratory test-setup are numerous and should prove beneficial to the further development of the VSG concept@en

The increasing growth of dispersed generation not only changes the structure of the typical power system but also changes the way short and long term stability is handled due to lack of synchronous rotor inertia. The Virtual Synchronous Generator (VSG), which is a device that emulates synchronous inertia, is proposed and studied as a potential solution. The major components of a VSG, as far as hardware is concerned, comprise an energy storage and a power processor. This paper suggests a control algorithm for the power processor that enables multiple VSG units with different specifications to coexist and to provide for short and longer term frequency stability.@en

The method to investigate the interaction between a Virtual Synchronous Generator (VSG) and a power system is presented here. A VSG is a power-electronics based device that emulates the rotational inertia of synchronous generators. The development of such a device started in a pure simulation environment and extends to the practical realization of a VSG. Investigating the interaction between a VSG and a power system is a problem, as a power system cannot be manipulated without disturbing customers. By replacing the power system with a real time simulated one, this problem can be solved. The VSG then interacts with the simulated power system through a power interface. The advantages of such a laboratory test-setup are numerous and should prove beneficial to the further development of the VSG concept.@en

The future power system integrated a large share of distributed generation (DG) may causes a reduction of the system rotational inertia, resulting in high frequency variations with any disturbances. An additional rotational inertia will be provided to the system if many DG units combined with relative small storage systems operate like virtual synchronous generators (VSG). This paper presents the demonstration approach for the VSGs in order to bring the VSG models developed in the laboratory into practice at two distribution test sites for both single- and three-phase applications. The results show promising results where changes in frequency and voltage are clearly counteracted by power flows from the VSG. In addition, VSG may provide a solution for hosting a large share of DG in future grids while maintaining system stability.@en