Overall Goals of the Nuremberg Demonstrator
The main objectives of the Nuremberg Demonstrator are the implementation, the demonstration and the validation of new control strategies for micro-generation devices, like heat pumps (HP-Units) or combined heat and power units (CHP-Units) in combination with energy storage systems in larger buildings. In this way, energy procurement costs can be minimized or self-consumption of locally generated energy can be maximized. The control strategy utilizes forecasts for energy loads and weather as well as electricity prices to optimize the operation of the building-integrated storages, controllable loads and generators. The energy storages allow an uncoupling of generation and demand and provide more flexibility to the whole system. In Nuremberg, the benefits of the interaction between buildings and a smart grid are demonstrated in a laboratory environment.
Overall Demonstrator Architecture
The Building Energy Management System (BEMS) is the central control component for the building devices. The BEMS is connected to the Energy Market Service Platform and the Analytics Platform via the Real Time Integration Platform. Via this interface, forecasts for PV production, weather and the expected thermal and electrical energy demand are available. In addition, energy prices can be provided by an energy market interface. By making use of the information, the BEMS derives an operation schedule for the connected building devices.
For the demonstration of the new operation strategies a Hardware-in-the-Loop test bench is developed. The components of the test bench are spread over two locations and are connected virtually via the internet. For the Nuremberg Demonstrator the Building Energy Management System Lab at Siemens in Erlangen and the Generator-System-Lab at the Technische Hochschule Nürnberg Georg Simon Ohm are used. Both labs are coupled by exchanging measurements and control information and aggregating the energy at the virtual Point of Common Coupling.
Building Energy Management System Lab
Pictured is the electrical part of the Nuremberg Demonstrator, located at Siemens in Erlangen. This includes:
- an electrical base-load emulator
- a PV system
- the Point of Common Coupling
- an electrical battery and the Building Energy Management System
On the roof of the building, a full featured heating, ventilation and air conditioning system is available. The standard Building Automation and Control System (Desigo) is extend by a Building Energy Management System with controls all storages, controllable loads and generators in both labs of the Nuremberg Demonstrator.
The test bench in the Generator-System-Lab includes:
- a combined heat and power unit
- a heat pump unit for providing thermal energy for heating purposes and the supply of domestic hot water
- three thermal buffer storage units and a storage unit for domestic hot water are connected to the generation devices.
The test bench also includes the Building Thermal Load Emulation System (BTLES), which allows the emulation of the thermal load of a simulated building and the emulation of the heat source for a geothermal heat pump. Therefore the BTLES is connected to the cooling and heating network of the laboratory and is also coupled to the thermal building simulation TRNSYS. Like this a flexible testing environment for the generation units and the BEMS is provided, which allows the emulation of arbitrary building designs.