Robust Controller Design for the Emergency Response Module of Energy Router

As the core equipment of Energy Internet (EI), the energy router (ER) plays an important role in information transmission, energy transmission and system control. When the microgrid (MG) in the regional power grid is re-integrated into the distribution network after a fault being detected, the output fluctuation of distributed power sources such as photovoltaics (PVs) and wind turbine generators (WTGs) in the MG is easy to cause a detrimental impact on the energy transmission module in the ER, resulting in local grid oscillation and voltage instability. Therefore, how to ensure the stability of the energy transmission module of the ER needs to be investigated. This paper considers the emergency response module of the ER with an information-energy integration framework. A robust H∞ control method for the short-term energy buffer adjustment of the considered ER is formulated. Stochastic differential equations have been used to describe the physical dynamics of the studied ER. Meanwhile, the circular buffer connection of the ERs is used to improve energy transmission efficiency. Simulations have evaluated the stability effect of the proposed regulation method.