Jiangsu Go-Sin Electric

SST DC Power Supply Demonstration Project for Computing Data Center, Huailai, Zhangjiakou, Hebei

2026-06-09

Project Location: Digital Economy Industrial Park, Huailai County, Zhangjiakou City, Hebei Province

Project Type: New Flexible Power Supply Demonstration Project supporting the East-to-West Computing Initiative (Reference Case for Internal Use)

Commissioning Time: December 2025

Equipment Configuration: 4 sets of 10kV/750V, 1.25MW SiC Solid State Transformers (SST), forming a DC bus power supply architecture for the industrial park

1. Project Background

As a key computing hub of the Beijing-Tianjin-Hebei region, Huailai of Zhangjiakou previously adopted a multi-stage conversion power supply solution consisting of power frequency transformers, low-voltage distribution cabinets and rectifiers. This solution is plagued by excessive equipment layers, large floor space, high power conversion loss, poor power quality and limited capacity for new energy consumption.

With the large-scale deployment of high-density AI computing cabinets, DC UPS and DC ultra-fast charging equipment, the conventional AC power distribution system can no longer meet the requirements of data centers for low power loss, high reliability and fast response. This project adopts high-voltage direct-connected solid state transformers to build a streamlined AC/DC hybrid power supply system.

2. Technical Solution

Conventional power frequency transformers and integrated low-voltage rectifying equipment are eliminated. The high-voltage SST direct DC step-down solution is applied: 10kV high-voltage AC is converted into 750V DC via a single stage of solid state transformer, and directly connected to the DC bus of the data center to supply power for IT cabinets, energy storage systems and backup power supplies in a unified manner.

The equipment adopts fully modular SiC power devices, supporting hot-swap capacity expansion, millisecond-level fault isolation, active harmonic suppression and adaptive reactive power regulation.

3. Application Results

Greatly reduced floor space: The integrated design of SST cuts the footprint of power distribution area by over 60%, eliminating the need for new large-scale power distribution rooms.
Lower power loss: The single-stage conversion efficiency reaches 97.8%. Compared with traditional multi-stage systems, the annual power saving rate increases by 3%–5%.
Improved power supply reliability: It delivers millisecond-level protection against short circuit, overload and abnormal voltage, completely resolving harmonic interference and voltage fluctuation in computing rooms.
Better adaptability to new energy grid connection: It enables nearby integration of distributed photovoltaic power in the park, raises the self-consumption rate of green power and facilitates the zero-carbon transformation of data centers.