Haihong Electric’s 3D Wound Core Transformer Safeguards Commissioning of China’s First Grid-Forming Wind-Solar-Storage Integrated System

Recently, China’s first grid-forming wind-solar-storage integrated system applied for real-time power supply at substations—the Houhai San (Chunhui Station) demonstration project—was successfully commissioned. This marks a significant breakthrough in China for the integrated application of grid-forming energy storage technology and urban distribution networks. In this landmark project, Haihong Electric’s 3D Wound Core dry-type transformer technology provided solid technical support for the system.

3D Wound Core Dry-type Transformer Technology Precisely Matches Energy Storage System Requirements

The grid-forming wind-solar-storage integrated system deeply integrates and organically coordinates clean wind energy, abundant solar energy, advanced energy storage technology, and exhibition hall power supply systems, forming a localized smart energy microgrid with active support capabilities. This system imposes stringent requirements on the stability of distribution transformers. Haihong Electric deeply integrated its self-developed Fully Insulated Open Ventilated 3D Wound Core Dry-type Transformer technology with the grid-forming system, achieving precise technical matching.

The 3D Wound Core dry-type transformer serves, on one hand, as the "Anchor of Stability" for the system's stable operation: the equipment provides a stable grid connection foundation for unstable power sources like wind and PV, enabling their smooth integration into the urban grid. On the other hand, it acts as the system's "Independent Heart." When the main grid experiences faults or other situations requiring disconnection from the urban grid, it can help the system achieve a seamless, millisecond-level handover, smoothly transitioning from the urban grid to independent microgrid operation. This provides uninterrupted and stable power to various equipment within the area, ensuring highly reliable power supply.

Fire and Explosion Prevention Design Establishes Distribution Safety Barrier

Safety is the lifeline for the development of all energy storage systems. This project is located in the core area of Houhai, Nanshan, Shenzhen—a densely populated and built-up urban core—and is adjacent to landmark buildings such as the Shenzhen Spring Bamboo Tower. Consequently, the project has extremely high fire safety requirements for equipment. Haihong Electric prioritized safety performance from the initial design stage, ensuring reliable equipment operation under extreme conditions through multiple innovative technologies. The equipment utilizes class R(C) insulation materials, which are heat-resistant and possess self-extinguishing characteristics, offering outstanding advantages in fire and explosion prevention. This provides a solid safety guarantee for the power distribution of the Houhai San (Chunhui Station) demonstration project.

Innovating with the Times, Serving National Energy Strategy

From traditional power distribution to new energy integration, and from conventional substation to grid-forming energy storage, Haihong Electric has always remained at the technological forefront. In response to the strict requirements of energy storage systems for high efficiency, safety, and reliability, the company continuously optimizes product design and enhances manufacturing processes. The successful application in the Houhai San (Chunhui Station) demonstration project is a concentrated reflection of the enterprise's technical strength and market foresight. Facing the rapidly developing energy storage sector, the company continues to increase R&D investment, promoting the resonance between transformer technology and the construction of new power systems.

Looking ahead, with the deepening advancement of China's new power system construction, energy storage systems will find broader application space. Haihong Electric will continue to resonate with national strategies and the demands of the times, contributing wisdom and strength to the energy transition with safer, more efficient, and more reliable power equipment, and collaborating with industry partners to jointly compose a new chapter in the development of energy storage technology.

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