Energy Distribution

Medium Voltage – Energy Distribution
© Fraunhofer ISE

In addition to large-scale PV power plants, there are other promising applications for energy distribution in the medium-voltage range: high-performance charging infrastructures for sustainable mobility, DC microgrids in industrial production in the process industry, and also aspects of system stability.

Charging Infrastructure for Electric Buses, Trucks and (Heavy) Commercial Vehicles

In the field of mobility, the electrification of commercial vehicles such as trucks, ships and airplanes is developing rapidly. Due to their large battery capacities, these vehicles require high charging power for fast charging. By increasing the system voltage with the corresponding decrease in current, simplifications could be achieved that enable lighter cables and plug contacts to be used. This would not only make them easier to use, but also significantly reduce electric heat losses.

In Germany, charging points for cars and trucks are required every 50 km along highways. To meet this high energy demand, charging stations could be equipped with an installed power of up to 32 MVA, which corresponds to the energy demand of a small town. A combination of on-site renewable energy generation and storage would be an ideal solution to relieve the strain on the grids. Also, PV roof systems over parking lots are a great way to produce energy locally. With the introduction of medium voltage and a MV-DC bus system, energy efficiency could be improved and material usage reduced. Such concepts are considered forward-looking solutions for charging infrastructures.

Process Industry: DC Microgrids in Industrial Production

Energy costs are a significant factor in industrial production. DC microgrids could play a key role in future manufacturing, as they can directly take in the DC electricity from renewable sources and storage facilities. This avoids the losses that occur when converting AC to DC. In sectors such as chemicals, pharmaceuticals, metal production and the food industry, the use of DC grids could increase energy efficiency and contribute to CO2 neutrality. DC microgrids can minimize energy losses and increase operational efficiency since fewer energy conversion stages are required and the renewable energy can be directly fed into the grid.

System Stability and Efficiency

DC microgrids enable a resilient energy supply that is less dependent on the traditional AC grid. This is particularly advantageous for neighborhoods, charging infrastructures or industrial operations. The decentralized generation and storage of energy in these grids not only minimizes energy losses, but also offers specific advantages for industrial processes, such as higher availability and redundancy. With grid expansion and higher outputs, the potential and cost benefits also increase, meaning that DC systems could play an increasingly important role in the future energy infrastructure. The implementation of DC-based systems such as the MV-DC bus system could represent an efficient solution for energy distribution in the future, offering both economic and ecological benefits.

R&D Services

We provide R&D services for manufacturers of power electronic devices and systems and manufacturers of components and systems for MVDC grids. We also provide services for manufacturers and operators of high-power charging infrastructures, energy suppliers, grid planners and operators, as well as operators of flexible systems, project developers, system integrators and system manufacturers. Our range of services include:

  • Development of efficient high-power converters for low and medium-voltage applications
  • Feasibility and concept studies for high-power electronic systems
  • Advice and expert opinions on power electronics issues
  • Grid simulation and system modeling in accordance with grid connection guidelines
  • Analysis and optimization of protection systems
  • Error analyses, troubleshooting and tests in the lab and on the field

Our R&D Infrastructure on this Topic


R&D Infrastructure

Center for Power Electronics and Sustainable Grids


Digital Grid Lab

with intelligent, fully integrated charging infrastructure for electric vehicles.


Accredited Lab

TestLab Power Electronics

Testing and characterization of power converters up to the multi-megawatt range.

Selected Research Projects



High-Voltage Megawatt Charging System for Heavy-Duty and Passenger Traffic



Impedance Analysis of PV Power Plants to Ensure Stable and Reliable Operation on the Grid


Press Release on the Research Project HV-SiC

New High-Voltage Silicon Carbide Inverter Enables Stabilization of Medium-Voltage Grids

Further Information on this Research Topic


Power Electronics and Grids


System​ Integration