Similarly, efficient and reliable power converters must integrate variable renewable energy sources, ensure stable AC/DC conversion, handle high power levels, and maintain thermal efficiency, all while remaining cost-effective.

ABB will investigate the functional requirements and design of three DC-breaker topologies: i) Solid state MVDC breaker, ii) Hybrid MVDC breaker, and iii) Mechanical MVDC breaker with active injection. The most suitable technology will be selected based on electrical protection needs and cost targets, with validation performed initially at ABB’s facilities and later simulated on the 3kV DC grid at CIEMAT.

In parallel, CIRCE will explore AC/DC power electronic converter topologies that eliminate the intermediate DC-link between grid frequency and high-frequency transformers. The goal is to develop and test a control design in a unitary test setup, ensuring proper functionality of the proposed design. This model will then be adapted for CIEMAT’s microgrid Test Bench to assess its dynamic behaviour and impact on overall system performance.