Introduction
With the emergence of DC power distribution for data center facility applications, there is a need for specialized expertise on DC. We offer project engineering support and solutions for DC grids that can be realized in various variants using 350/700V, 700V or 700/1400V nominal voltages in unipolar or bipolar configuration. This is compatible with the 400/800V, 800V and 750/1500V voltages being discussed in the data center context. We offer semiconductor circuit breakers to protect these DC grids fully, and also selectively for ring and meshed topologies. Our battery storage converters can be connected to interface with battery units if desired, implementing robust droop control for both unipolar and bipolar DC grids. Our balancing converters can balance potential unbalance in bipolar grids, if needed. With the development of MVDC/LVDC SSTs, we are preparing for the next generation of DC Data Centers that reduce the complexity of grid code compliance and interaction with the AC utility grids.
Technologies for Data Centers
- Semiconductor (Solid-State) Circuit Breakers
- Solid-State Transformers (MVDC/LVDC SSTs)
- DC/DC Battery Storage Converters
- DC/DC Balancing Converters
- Energy Management (dynamic response and load shedding)
Commissioning Bipolar DC grid Architectures (350/700Vdc and 700/1400Vdc)
Our specialization covers the commissioning of Bipolar DC grid Architectures, specifically focusing on the nominal voltages of 350/700Vdc and 700/1400Vdc. Our technical framework addresses the complexities of these systems by defining and analyzing various midpoint (M) conductor configurations, including fully distributed, partially distributed, and non-distributed systems. This includes clarifying allowed system earthing schemes, isolation requirements, and the distinct protection considerations necessary for these different topologies.
Our contributions to the White Paper on low-voltage DC power distributions
The chapter led by Laurens Mackay from DC Opportunities defines and analyzes the two primary polarity configurations applicable to DC grids: bipolar and unipolar. For bipolar systems, various midpoint (M) conductor configurations are discussed, including fully distributed, partially distributed, and systems without a distributed M conductor. Allowed system earthing schemes are defined, and the grounding terminology used across UL and IEC standards is clarified. Additionally, the section outlines isolation requirements and options, along with the specific protection considerations for these different earthing schemes. A major contribution of the chapter is a comprehensive matrix that cross-analyses practical combinations of polarities, earthing schemes, and nominal voltages (350V, 700V, and 1400V). This section provides a detailed analysis of how these architectural choices impact electrical spacing, insulation requirements, device compatibility, wiring and cable losses, and protection devices. The final contribution of this chapter is the identification of the system combinations most likely to be successfully adopted in data centers. These recommendations are based on the section’s technical analysis, combined with feedback from field experts and industry leaders in power distribution technology