On Higher Order Dynamics in the Fundamental Equation of Frequency in Islanded Microgrids
Résumé
In islanded micro grids, the stability of the frequency has to be enhanced by the distributed producers. Moreover, distributed control schemes are highly appealing for evident robustness and flexibility reasons. This is generally achieved by using the fundamental frequency model in which the derivative of the grid frequency is proportional to the power unbalance in the grid. This paper discusses the relevance of this simple model when high gain closed-loop system is designed. In particular, the presence of higher order terms in the frequency dynamics that should be carefully taken into account in the distributed frequency control design is proved and appropriate frequency control law is proposed and validated.