Cooperative Voltage Control in AC Microgrids

This paper proposes a novel control scheme based on the joint use of decentralized Sliding Mode (SM) control and distributed averaging control for cooperative voltage regulation in Alternate Current (AC) microgrids. The considered model of the microgrid includes several Distributed Generation Units (DGUs) interconnected through resistive-inductive power lines. In each DGU a Voltage Sourced Converter (VSC) supplies an unknown current load. The proposed control strategy consists of two different control schemes. A decentralized SM control scheme constrains the state of the microgrid on a suitable manifold where the q -component of the voltage of each DGU is equal to zero. On this manifold, the d-component of the control input is generated by distributed controllers aimed at sharing the d-component of the generated current and preserving the average of the microgrid voltages. Global convergence to a desired steady state is proven and simulation results confirm the effectiveness of the proposed solution.