Optimization-algorithm addressing voltage and power quality in distributed grid control systems

Abstract

The transition from centralized grid control towards distributed and cellular control requires new methods and intelligent solutions for power generation, storage and transmission. Due to temporary occurrence of reversed power flow during low load conditions in distribution grids, the grid voltage may reach or may exceed voltage limits. Data centers and telecom facilities, which are equipped with batteries, generation units and power electronic grid interfaces are highly appropriate to offer services to the grid operators to solve this problem. One possible option to keep grid voltages within the limits is the transmission of reactive power over critical grid lines, generated at the connection points of renewable sources. Additionally, reactive power sources need to be provided at transformer stations to avoid additional reactive power flow towards the MV grid. The paper shows results of an ongoing research project, where four partners cooperate to demonstrate the effects and the automatic voltage optimization in a real existing low voltage grid. Research partners are Technische Hochschule Esslingen, KBR Kompensationsanlagenbau GmbH, Schwabach and VWEW-Energie, Kaufbeuren. The equipment has already been installed into the grid and is currently operated in the test phase.