Robust Passivity-Based Control of Boost Converters in DC Microgrids
It addresses voltage regulation in DC microgrids with unknown loads, but the approach is incremental as it builds on existing passivity-based control methods.
This work proposes a robust decentralized passivity-based control scheme for regulating voltage in DC microgrids with unknown ZIP loads, using a Krasovskii-type storage function. Experimental validation on a real DC microgrid demonstrates convergence to the desired equilibrium.
This work deals with the design of a robust and decentralized passivity-based control scheme for regulating the voltage of a DC microgrid through boost converters. A Krasovskii-type storage function is proposed and a (local) passivity property for DC microgrids comprising unknown 'ZIP' (constant impedance 'Z', constant current 'I' and constant power 'P') loads is established. More precisely, the input port-variable of the corresponding passive map is equal to the first-time derivative of the control input. Then, the integrated input port-variable is used to shape the closed loop storage function such that it has a minimum at the desired equilibrium point. Convergence to the desired equilibrium is theoretically analyzed and the proposed control scheme is validated through experiments on a real DC microgrid.