Salzburg - Austria

DG Demonet Smart Low Voltage Grid

Residential consumers
PV plants
Heat pumps
Home Batteries


Salzburg is one of the pioneers in Europe in developing and testing new solutions and approaches for intelligent energy networks. The Smart Grids Model Region Salzburg (SGMS) comprises over 30 projects. Applying the philosophy that “the whole is more than the sum of its parts”, the SGMS consortium has pursued the goal of connecting projects to create synergies: The different smart grid applications will be combined into an integrated system. implemented in communities so that they are concrete, demonstrable and evaluable. In addition to demonstrating technological solutions to real problems, the acceptance and user-friendliness of the system for customers plays a central role.

Project description

Integrating renewable energy sources into the distribution network requires intelligent network control solutions that involve producers and consumers to use the existing infrastructure more efficiently in order to increase the hosting capacity of the network to handle energy flow from decentralized renewable sources.

For this purpose, several field tests in over 30 different projects were implemented, one of which was an internationally premiered prototype(ZUQDE-controller and DG-Demonet-controller) for medium voltage networks, which used reactive power provided by decentralized hydropower(installed power about 9,25 MW) and the flexibility provided by the transformer(OLTC) situated in the primary substation to create a grid/feeder optimum increasing the available hosting capacity.

The project area Smart Infrastructure Salzburg also includes intelligent system integration for e-mobility. In this area of application, the effects of a high concentration of electric vehicles on the power grid were examined and a concept for interaction between the power system and its users was developed.

The third area of applications concerns the intelligent integration of residential customers and decentralized generation into the low voltage power grid of our model community Köstendorf. Using a second prototype control unit for low voltage grids called “Smart Low Voltage Grid – Controller” (SLVG-C) an optimized control strategy for decentralized pv-systems(41), e-mobility(36) was created and implemented in project “DG Demonet Smart Low Voltage Grids” using a low voltage grid with ~90 households, starting in 2011 and ending in 2014.

Starting in 2015 this control unit was improved to also include decentralized battery storage systems within project “Leafs” which will research the the impact of different operational strategies(e.g.: providing balancing power) employing home storage systems(5), pv-systems(45) and e-mobility(33).

Project HiT, starting in 2011 and ending in 2014 was focused on building a smart grid ready housing-complex in the city of Salzburg. The project also called “Rosa Zukunft” was used to build and optimize a housing complex with ~130 households through installing a thermal storage unit(90m³), a pv-system, a heat pump and a CHP-system, trying to be as grid-friendly as possible.

The fifth and final area of application is the combination of the low and the medium voltage control approach taking two optimized grids and generating a global optimum. This approach is studied mainly in project DeCAS, were the control algorithm involved will start to optimize the electricity grid, starting at the high voltage 110kV-level in the primary substation and ending at the low voltage level in the households of every “prosumer”.



Use cases

Voltage Regulation

Voltage Regulation has been researched in several projects in the SGMS (see below), and valuable findings are available, especially regarding the integration of renewable energy sources and addressing the challenges of mass deployment of electric cars.

Energy Storage

Energy storage using decentralized battery systems is a recent development

Demand Side Management

In several projects and demo sites especially the potential of residential buildings and the inclusion of the end users for demand side management have been explored,  and several approaches have been successfully implemented and tested.