Power electronics and grid technologies in the multi-megawatt range

Visualization of the "Center for Power Electronics and Sustainable Grids" on Zinkmattenstraße in Freiburg: main building (left) and laboratory (right).

Researching smart energy concepts

Our smart energy laboratory is fully equipped with regenerative and efficient electrical and thermal generators and storage systems for future single and multi-family houses.

Center for Power Electronics and Sustainable Grids

The Center for Power Electronics and Sustainable Grids has an infrastructure that is one of its kind in the world and features unique laboratory equipment.

With our TestLab Power Electronics, we have many years of experience in the testing, characterization, and optimization of power electronics components and systems. This allows us to investigate the influence of inverters at all levels of the grid very precisely, among other things. Thanks to a dedicated connection, designed for 40 MVA, of our new laboratory to the 110 kV network level, we are able to operate Power Generating Units (PGUs) and power converters up to the multi-megawatt range. In addition to conformity with the latest grid codes, such as HVRT and LVRT, we also test the stability and reliability of PGUs and their components. Besides our testing activities, we also develop inverters for low and medium voltage in our laboratories according to the requirements for the respective applications and in close cooperation with our customers. We accompany them from the initial idea to the release for series production.

The Center for Power Electronics and Sustainable Grids is also fully equipped with decentralized generating technologies, energy storage systems and loads for future residential and commercial buildings to research smart energy concepts. Both individual systems and integrated concepts of system suppliers can be tested in a realistic environment using this combined heat and power infrastructure. We conduct customer-specific investigations, such as the evaluation of grid compatibility, efficiency or business models with the help of individual reference scenarios. Intelligent plant management concepts and networked control systems are also developed, implemented on prototypes and tested.


Technical Facilities

Dedicated high-voltage connection for research purposes

110 kV / 20 kV / 40 MVA own transformer for R&D purposes

Highly precise and broadband current and voltage measurement at all voltage levels

20 kV / 20 MVA medium voltage connections with separated switch-gears

Gas connection for the operation of internal combustion engines

Hardware-in-the-loop real-time simulation system (OPAL-RT)

Medium voltage laboratories and test facilities

2x 2.5 MVA transformers from 20 kV to 3, 6, 10, 20, 30, and 36 kV

200 kVA transformer from 230 V to 3 … 36 kV at 16.67 Hz

660 kW DC sources from 3 to 40 kV

Resistive loads up to 36 kV and 1 MW

Test benches for static and dynamic semiconductor characterization up to 20 kV / 1000 A

Low voltage laboratories and test facilities

2x 3.2 MVA parallel switchable transformers from 20 kV to 300 … 1000 V

6 MW / 1500 V DC sources and PV simulators

1 MVA high bandwidth and bidirectional grid simulator

7 MVA stationary LVRT and HVRT test bench (in planning)

R, L, C loads up to 1 MVA for anti-islanding and micro-grid tests (in planning)

160 kVA electronic machine emulator

Test bench for partial discharge (in planning)

Field Test Equipment

1 MWp ground-mounted PV-array

4.5 MVA mobile LVRT test bench (40’ container)

GPS synchronization with up to 96 measurement channels

Sampling rate up to 1,000 kHz

High-precision power meters up to 5,000 A / 1,000 V


Electric load simulator to reproduce load-profiles with high resolution and dynamic

PV simulator to reproduce IV characteristics with high resolution and dynamic

Computer-assisted hardware-in-the-loop emulator to simulate thermal load profiles

Test bench for common battery storage systems

Networked charging stations for the integration of e-vehicles in households or intelligent quarters

Comprehensive monitoring for the evaluation of system performance vs. reference scenarios