Analysis of the Behavior of Synchronverters Operating in Parallel by Means of Component Connection Method (CCM)

It has been recently demonstrated that synchronization units of converters operating nearby may interact with each other affecting the stability of the system. Synchronverters have gained interest from the research community due to their capability of emulating the behaviour of synchronous machines (SMs), therefore being able to self-synchronize themselves to the grid without the need of a dedicated unit. However, parallel operation of synchronverters has not yet been properly investigated in literature. In this paper this topic is investigated by means of eigenvalue analysis. An accurate model of the system under study is developed by adopting the component connection method (CCM) technique, which allows to easily obtain the state-space representation of a complex system. It is demonstrated that the stability of the synchronverter could be negatively affected by the presence of another synchronverter operating in parallel, unless proper measures are taken. The developed frequency-domain model is validated against time-domain simulations in MATLAB/Simulink/PLECS and experimental results with a power-hardware in the loop (PHIL) test bench.