Siemens and Reinhausen solid-state transformer for AI data centres

Siemens has partnered with Reinhausen (MR) to develop and industrialise a solid-state transformer for use in AI data centres.

With data centre infrastructure having to transform to accommodate AI requirements, the industry is moving from traditional power architectures towards more efficient and scalable solutions capable of supporting the next generation of AI workloads. Solid-state transformers (SSTs) are a key building block in this transition.

AI data centres create an increased need for medium-voltage connection, power density, efficiency and availability. For an 800 VDC distribution system, a medium-voltage solid-state transformer provides a compact, efficient and galvanically isolated alternative to conventional multistage AC/DC power-conversion architectures. In this architecture, medium-voltage AC is converted to 800 VDC and distributed to the data centres, reducing intermediate conversion stages and enabling more efficient power delivery to high-density AI infrastructure.

MR is a leading manufacturer of voltage regulation technology for power transformers and has decades of experience in power quality and grid stability. The company also specialises in the field of medium voltage power electronics and related components, which are at the heart of modern SST architectures.

Siemens combines expertise in power electronics, electrical power solutions, grid protection and automation systems as well as digitalisation. In the deployment of SSTs, Siemens applies its capabilities in grid integration, power conversion, protection and control to deliver next-generation energy transmission systems for AI data centres.

Key features of the product include modularity, scalability and high availability. The design supports operation up to 36 kV and can be modularly applied to lower voltages, making the architecture scalable for different grid-connection conditions. It delivers a stable 800 VDC output for applications that require a stable DC-link voltage and direct coupling to downstream DC distribution or load systems. The SST design is built around clearly defined interfaces, and protection technology to support reliable operation in demanding infrastructure environments.