A Review of Primary and Secondary Control for Islanded No-Inertia Microgrids

Microgrid (MG) control represents an impactful and important topic in current academic and industry research related to power systems. MG operations can be distinguished in grid-connected and islanded operations. Among these two, islanded operation is for sure the more challenging since the MG control need to cope with voltage and frequency regulation that is usually not a problem for grid connected ones. Achieving these goals become even more complex if no-inertia MGs are considered i.e. MG where no synchronous generation is directly connected to the grid. This paper proposes a detailed review of state-of-the-art architecture for the hierarchical control of islanded, no-inertia MGs in order to highlight its characteristics and limitation with the aim of providing a suitable background for further developments of control approaches for this kind of applications.