Xinjiang Hami 1GW Wind-storage Integrated Project Nacelle Transformer Supply

Xinjiang Hami 1GW Wind-storage Integrated Project Nacelle Transformer Supply

With the rapid growth of AI training, cloud computing and big data services in Northeast China, an intelligent computing center in Harbin New Area launched its Phase I expansion project. The project planned to add approximately 1,800 cabinets and about 18MW of new IT load. To support 24/7 continuous operation, the customer required a highly reliable power distribution system with dual power supply access and a double-bus power distribution architecture.

Project Background

Xinjiang Hami is one of China’s important wind power development bases, with abundant wind resources and an annual average wind speed of more than 8m/s in key development areas.

The project adopts 5MW-class wind turbines. Each turbine is equipped with a nacelle transformer to support power conversion and transmission after power generation. Due to the operating environment and limited installation space inside the nacelle, the transformer needed to meet special design requirements for compact size, lightweight structure, insulation reliability and vibration resistance.

Products Used in This Project

Customer Challenges

Why the Customer Chose DHDL

During the bidding and technical evaluation stage, the customer focused on wind power project supply experience, extreme environment operation capability, product reliability and quality assurance. Wind turbine nacelle transformers are significantly different from conventional distribution transformers, because they operate under long-term vibration, frequent operating changes and limited installation space.

DHDL had previously participated in multiple onshore wind power, offshore wind power and renewable energy base projects. With experience in nacelle transformer design, manufacturing and on-site service, DHDL was able to better understand wind turbine operating conditions and the project’s equipment requirements.

The project site in Hami also involved high altitude, severe winter cold, summer heat, wind-sand erosion and large temperature differences. After evaluating drawing design, raw material control, insulation system design, vibration resistance, factory testing standards and quality traceability, the customer considered DHDL suitable for the project’s long-term reliability requirements.

DHDL Solution

For the long-term operation of wind turbines, DHDL carried out dedicated optimization during the product design stage. The transformer adopted an H-class insulation system, and key insulation materials were selected with high-temperature resistance to improve reliability under long-term full-load operation and temperature fluctuation.

To improve vibration resistance, DHDL optimized the winding clamping structure and core-body fixing method. This helped reduce the risk of loosening caused by long-term mechanical vibration during wind turbine operation.

Considering the large temperature difference and strong wind-sand conditions in Xinjiang, DHDL applied special design measures to the enclosure protection and insulation system, helping the equipment adapt to complex outdoor renewable energy operating environments.

Quality Control

During production, the customer appointed professional third-party inspectors to participate in full-process quality supervision. Complete quality records were established from silicon steel sheet procurement, coil winding, vacuum varnish impregnation, final assembly and factory testing.

This ensured that each transformer could be traced throughout the whole manufacturing process and that the project’s batch supply quality remained consistent.

Customer Feedback

After the first batch of wind turbines was connected to the grid, the customer continuously tracked the operation of the nacelle transformers. So far, the equipment has operated continuously for more than 12 months, with no turbine shutdown caused by transformer failure. Under both summer high-temperature and winter low-temperature conditions, temperature rise, insulation performance and operating noise remained stable.

Follow-up Cooperation

After the successful operation of this project, the customer invited DHDL again to participate in equipment selection and technical solution discussions for subsequent wind power base projects.

In 2026, both parties reached a cooperation intention for another renewable energy base project in Xinjiang, with a planned additional purchase of 180 nacelle box-type transformers. The customer stated that DHDL’s stable product quality, technical response and problem-solving efficiency were important reasons for continued cooperation.