Voltage Stabilization in a DC MicroGrid by an ISS-like Lyapunov Function implementing Droop Control

The interconnection of renewable energy sources with storage systems through a Direct Current (DC) MicroGrid is one of the best ways to deal with the need for reliable power networks. An approach based on the “System of Systems” philosophy using distributed control methodologies is developed here with the purpose to share the duty to ensure grid voltage stability among a number of devices ensuring fast response. The closed-loop stability proof is based on an Input-to-State-Stable (ISS) like Lyapunov function.