Centralized Strategy Incorporating Multiple Control Actions Applied to Advanced Microgrids

This paper evaluates multiple control actions applied to centralized advanced microgrids (MGs). Feedback (F), feedforward (
$f$
), and disturbance decoupling (D) control actions commonly addressed in the well-known current control of distributed energy resources (DERs) are extended to advanced MGs. Analytical expressions are derived to show the effect of each control action on the well-established DER current control and then on advanced MG control. Comprehensive comparisons between the
$F$
and
$F f D$
(i.e., with all control actions) strategies are performed for both DER and MG controls. Simulation results show a dynamic response improvement in load disturbance rejection when all control actions are considered, as well as a reduction in steady-state error to grid power flow control. By employing low-bandwidth communication between DERs and central controller, no hardware retrofit is required in comparison to what is needed in other state-of-the-art centralized MG controls.