Contents I. Introduction
THE rapid evolution of the energy landscape and the accompanying challenges drive the advancement of power systems based on power electronics [1]. In this regard, microgrids play a significant role [2] as they offer an effective means of integrating distributed energy resources (DERs), such as renewable sources and energy storage systems, and managing loads connected to the ac distribution system through electronic power converters (EPCs). The ability to control power flexibly is crucial for EPCs in microgrids. It enables them to respond to power references provided by controllers for local power flow optimization [3], meet demand-response requirements within the microgrid, and participate in transactive energy markets [4], [5]. Another vital aspect is the availability of appropriate EPC controllers that allow the microgrid to operate independently from the main grid, which is valuable in various modern scenarios [6], [7]. Furthermore, regarding the control of fundamental quantities at the output of EPCs to enhance power quality, unbalanced-current control must be considered. This control flexibility can be utilized to compensate for unbalanced currents measured at the connection with the upstream grid in three-phase systems with unbalanced loads, which are common in low voltage grids. This scenario is illustrated in Fig. 1.
