Cooperative Control Strategy of Multifunctional Inverters for Power Quality Enhancement in Smart Microgrid

This paper deals with a cooperative strategy, based on the conservative power theory decomposition, which can be applied to control the inverters used to connect the distributed energy resources in a three-phase microgrid. In addition to inject/absorb active power at their point of connection, these inverters are operated according to their available power capability so as to enhance the power quality at the point of common coupling to the main network. Simulation results are shown considering, as an example, a three-phase three-wire microgrid equipped with two inverters, together with unbalanced and nonlinear loads. Among the different analyzed situations, the possibility to supply reactive power at the point of common coupling is shown with a view to provide voltage support, which is an asset in the framework of smart distribution networks.