A Class of Optimal and Robust Controller Design for Energy Routers in Energy Internet

Abstract

In this paper, a class of optimal and robust controller is designed for a typical energy router (ER) within the scenario of an energy Internet (EI) from the control perspective. As the core element of the EI, the considered ER is assumed to have access with photovoltaic (PV) units, wind turbine generators (WTGs), micro-turbines (MTs), fuel cells (FCs), battery energy storage (BES) devices, super capacities (SCs), loads and other ERs. Two control objectives are considered as follows. 1) Since the access of large-scale renewable energy sources (RESs) would lead to excessive DC bus voltage deviation within the ER system, a desired controller shall regulate the voltage deviation effectively. 2) According to the operational principle of EI, when multiple ERs are interconnected, an autonomous power balance of each ER is expected to be achieved with priority. Then the optimal energy dispatch problem shall be considered. When both two problems are considered simultaneously, a mixed robust H 2 /H ∞ control problem is formulated and is solved analytically. Simulations show the usefulness and effectiveness of the proposed scheme.