Solid-State Transformers Could Power the AI Boom
Solid-state transformers, a modern alternative to century-old designs, show promise in meeting rising energy demand and improving grid efficiency for the AI era.
Transformers are vital, yet often overlooked, components of our electrical grid, enabling the efficient long-distance transmission of power. However, with their basic design remaining largely unchanged for about a century, these devices are struggling to keep pace with the surging electricity demand, particularly from electric vehicles and data centers.
Researchers and companies are actively seeking to modernize transformers to address this growing need. A new generation of solid-state transformers could alleviate supply concerns and ensure the grid can handle increasing pressure.
Highlights
- Solid-state transformers integrate magnetic components with high-power semiconductors, making them more compact and offering greater control over electricity flow compared to conventional transformers.
- Beyond stepping voltage up and down, this new technology can also perform the functions of devices like rectifiers (AC to DC converters) and inverters (DC to AC converters), reducing the overall footprint of electrical equipment and potentially cutting power losses.
- The New York Power Authority and the Electric Power Research Institute (EPRI) successfully tested a one-megawatt solid-state transformer under realistic utility conditions, observing approximately 98% efficiency.
- Given that a conventional transformer and rectifier combined are about 96% efficient, solid-state transformers could halve power losses from traditional equipment.
- Companies like Heron Power are securing significant investments to commercialize solid-state transformers, focusing on applications in data centers, solar power arrays, and grid batteries.
Details
Conventional transformers typically rely on large quantities of specialized steel alloys and miles of copper wire. In contrast, solid-state models use semiconductors to achieve the same capacity with much smaller magnetic cores. Srdjan Lukic, a professor of electrical and computer engineering at North Carolina State University, notes these devices can be roughly one-tenth the size of conventional transformers.
Solid-state transformers operate by first converting incoming AC power to DC, then to higher-frequency AC power using semiconductor switches (such as silicon carbide). This process allows for greater control over the current's frequency and stability, enabling a significantly smaller magnetic core. They also provide galvanic isolation, which helps limit disturbances across the grid and enhances safety.
While current prototypes operate at relatively low voltages (around 15,000 volts), tests have demonstrated their success under real-world conditions. Further engineering development is required to adapt them for higher voltages needed in industrial facilities and long-distance transmission lines. Heron Power, for instance, has raised $140 million for commercialization and is building a $100 million factory set to begin production in 2027.
Why it matters
Global electricity demand is rapidly increasing, driven by the proliferation of AI-powered data centers and electric vehicles. As existing grid infrastructure struggles to keep pace, innovative solutions like solid-state transformers are crucial. By reducing energy losses and making the grid more efficient and resilient, this technology can play a critical role in meeting our future energy needs and is seen as a significant step forward in energy infrastructure.