The Highly Efficient And Reliable smart Transformer (HEART)


Schleswig-Holstein is funding the construction of a medium voltage laboratory

The state is co-funding the construction of a medium voltage laboratory at the chair of power electronics from the “Landespgroamm Wirtschaft” (EFRE). This project follows the target to extend the research for the grid integration of renewable power plants to medium voltage, where already today all large plants are connected. With the availability of this infrastructure, it will be possible to investigate and solve problems in the actual electrical distribution grid. The laboratory will enable to test power electronics up to 10 kV AC and up to 1 MW power.

Technical Specifications:

Voltage Level (MV)

[2,4,6,8,10] kV

Voltage Level (LV)

400 V


1 MW

Maximum Current

1600 A

Cooling Power (liquid)

60 kW

Cooling Power (Air)

10 kW


Layout of the MV Laboratory with experimental setups


This laboratory will be equipped with a Real Time Digital Simulator (RTDS) and a power amplifier in order to test power electronics prototypes under realistic conditions. The RTDS system and the power amplifier setup will enable the realization of extensive converter tests without affecting the real grid. The setup consists of:

  •  RTDS system (2 racks for a maximum of 360 single-phase nodes simulated)
  •  Medium Voltage connection of 10 kV
  •  Air conditioned room for power electronics converter testing
  •  AC power source
  •  DC Power source
  •  Electronic loads
  •  Voltage Source Converters



RTDS configuration for power converter testing



The laboratory of the Chair is equipped with a setup for Thermal Characterization of Power Electronic Converters (TC-PEC). This setup enables the thermal characterization of power electronics in real operating conditions which is relevant for a cost effective system design and can be used for lifetime prediction of the components. The voltage range of the equipment enables tests for low voltage and medium voltage devices. The setup consists of:

  •  A high speed Infrared Camera with positioning system (355 Hz sampling frequency for 640x542 pixel)
  •  An Optic fiber temperature measurement system (8 channels, sensor response times up to 5 ms)
  •  DC power source (4 kV, 60 kW)
  •  AC power source (45 kW)
  •  Electronic loads
  •  Power analyzer with 6 channels
  •  A 12 Bit Oscilloscope


New High Speed Thermal Measurement System for Semiconductor Reliability Analysis

The overall setup is managed by a control and synchronization system, which controls every component and merges the measurements.

Thermal Setup



Chair of Power Electronics

  • Chair of Power Electronics, CAU Kiel