Leading Innovation for Energy Transition IEEE


Tutorial T1 (Full day)

The Smart Transformer: Impact on the Electric Grid and Technology Challenges


  • Marco Liserre, Chair of Power Electronics, Kiel University, ml@tf.uni-kiel.de
  • Giovanni De Carne, Chair of Power Electronics, Kiel University, gdc@tf.uni-kiel.de
  • Rongwu Zhu, Chair of Power Electronics, Kiel University, rzh@tf.uni-kiel.de
  • Ali Kazerooni, WSP, Ali.Kazerooni@wsp.com
  • Michael Eves, SP Energy Networks, meves@spenergynetworks.co.uk


The increasing connection of renewables and new loads is challenging the distribution grids. For overcoming actual and foreseen challenges, a new concept, with the capability to form intelligent grid nodes, is proposed: the “Smart Transformer”. The Smart Transformer is a power electronics-based transformer, aiming not only to adapt the voltage level from MV to LV grids but also providing ancillary services to the grid. In order to exploit its capability, the ST requires combining power system aspects and power electronics constraints, resulting in new requirements and challenges.
This tutorial introduces the Smart Transformer concept and takes into account power system considerations as well as power electronics knowledge. ST architectures and topologies, basic controller designs and innovative concepts for increasing the availability are introduced. Hardware, control and grid connection requirements are described considering the matured industrial experience.
The Project will summarize the results of EU ERC Consolidator Grant Project “HEART” of Kiel University and OFGEM-funded project “LV-ENGINE” of SP Energy Networks, leading to testing the Smart Transformer technology in the field.


08:30-09:00 Registration
09:00-10:30 From the Solid-State-Transformer (SST) to the Smart Transformer (Marco Liserre)
10:30-10:45 Coffee break
10:45-12:15 The Smart Transformer in the distribution grid: LV-ENGINE project (Ali Kazerooni, Michael Eves)
12:15-12:30 Questions and Answers
12:30-13:30 Light lunch
13:30-15:00 The Smart Transformer: a grid-tailored Solid-State-Transformer (Marco Liserre, Giovanni De Carne)
15:00-15:15 Coffee break
15:15-16:45 ST virtuous loop: identify the LV-grid, control it, offer services to the MV-grid (Giovanni De Carne)
16:45-17:00 Questions and Answers

Short Biographies:

Marco Liserre

Giovanni De Carne

Rongwu Zhu

Ali Kazerooni

Michael Eves