DG DemoNet: Experiences from volt/var control field trials and control algorithm advancements

The field trials in the two MV grids - `Großes Walsertal´ and `Lungau´ give new insights to the voltage control algorithms developed prior over the last couple of years. These experiences include: Advancement of the voltage control with the on load tap changer and the distributed generators´ reactive power - `range´ and `level´ controller respectively - towards better utilization of the voltage band and reduced number of necessary transformer tap changes; Reactive power response dynamic of adapted existing and newly installed generators; Latency of communication and the implied problems; Effectiveness of volt/var control and controller performance in dependence of various grid and generation situations.