Autonomous Coordinated Control Scheme for Cooperative Asymmetric Low-Voltage Ride-Through and Grid Support in Active Distribution Networks With Multiple DG Units

This paper proposes a comprehensive autonomous coordination control scheme to achieve cooperative asymmetric low-voltage ride-through and grid support by multiple distributed generation units in an active distribution network. In addition to the decentralized nature of the proposed coordination scheme, it provides three important features: 1) a maximized flexible asymmetrical voltage support that does not affect the active current injection of individual units at the time of the support, 2) maximum support point tracking of each unit considering current, voltage, and power constraints, and 3) guided dynamic movement of the support points for each unit. The proposed scheme is examined in a practical test system, adapted from Hydro One medium-voltage distribution system in Ontario, Canada. Test results demonstrate the promising performance of the proposed control scheme.