A Distributed Voltage Controller for Medium Voltage Grids with Storage-Containing Loads

In this paper, a set-up consisting of a medium voltage grid with connected water distribution network as a load is investigated. The water distribution network contains water reservoirs that can be used as storages to support the voltage control by adjusting the electric power consumption to keep the voltages in the required limitations. At the same time the electric power and water demand are satisfied. The considered set-up is derived from a real-world set-up in the city of Kaiserslautern, Germany, where the power grid and water distribution grid are operated by the same operator. A distributed model predictive controller for the voltage control is designed in general form and thus the concept be applied to other loads containing storages. The controller is tested in simulations.