Thesis Bachelor / Master - Controller for Battery Storage System (m/w/d)


DE Wildpoldsried, BY, DE

Stellen-ID:  4018

At the earliest date possible we are looking for support for our #teamsonnen

Clean and affordable energy for all is one of the greatest challenges of our time. Sonnen has been committed to this mission since 2010 and is now represented in Europe, the USA and Australia with over 1,000 team members globally. In Germany, our offices are located in the beautiful Wildpoldsried (Allgäu) and the vibrating heart of Berlin Kreuzberg.

At sonnen, we are building the energy system of the future. To this end, we are developing new technologies and business models that have not existed before. Whether intelligent power storage, virtual power plants or digital services - we set the trends of a new energy world. That means, among other things, the inexpensive production and storage of renewable energy and the intelligent networking of producers and consumers. sonnen thereby gives people around the world the opportunity to become independent of fossil fuels and conventional energy supplier.

We are growing steadily and are looking for people who want to join us in our vision of clean and affordable energy for all while making a positive impact on climate change.

What your thesis will be all about:


Suggested Title:  Control of Battery Storage System for Enhanced Power Tracking


A battery storage system consists of 3 main components: energy management system, inverter and battery. The energy management system calculates power set points for the inverter based on the application, which is done in a time interval of less than 1 second. However, it is possible that a commercially available battery system is not fast enough to safely track the references from the energy management system. The mismatch between the inverter power and references can result in a jittering output and potential economic losses. Unfortunately, most commercial inverters are black-box systems, making it impossible for users to make adjustments.


In this thesis, the power tracking inertia of a standard, black-box inverter system will be studied. Different control algorithms will be investigated and evaluated for enhancing the power tracking capabilities of the overall system. The developed control algorithm will be verified in a suited simulation system environment.



What you will be doing for your thesis:


  • Literature review of battery storage system general structure.

  • Build a simulation environment in MATLAB/SIMLINK, Phyton or another suited simulation environment.

  • Modeling the dynamics of battery storage system power response.

  • Apply different control algorithms to enhance the overall power tracking.

  • Analyze the results and draw conclusion on the most suitable algorithms.

  • Implement the resulted algorithm in a battery control unit.



What you should bring to the table:


  • Background in Electrical Engineering and enrolled in a fitting academic study.

  • Strong background and interest in control theory.

  • Experiences with inverter system and system identification are preferable.

  • Strong programming skills.

  • Good team-player and an attitude to learn and explore new approaches.

What you can expect at sonnen:

  • An atmosphere of openness, tolerance and mutual respect, where innovation is expected and encouraged
  • Flexible working hours and option working mobile
  • Use of sports memberships (EGYM Wellpass, only €29.75/month) and discounts for other services and products 
  • Free German, English as well as online yoga and body art courses
  • Soft drinks, fruits and cereals in our offices
  • Mental health and wellbeing offering for you and your family members
  • Regular team and company events
  • We love dogs! You too? Feel free to bring your fellow friend to our offices

You feel we are a match? Apply now and help us to shape the energy transition together. We look forward to welcoming you to #teamsonnen!

sonnen - energy is yours!

Stellensegment: Accounting, Finance