Why Use a Solid-State Transformer?
The solid-state transformer (SST), also known as an Electronic Power Transformer (EPT), is a static electrical device that combines power electronic conversion technology with high-frequency energy conversion based on the principle of electromagnetic induction, enabling the conversion of electrical energy from one set of power characteristics to another.
Compared to conventional transformers, the EPT offers numerous advantages, with its most prominent feature being the flexible control of primary current, secondary voltage, and power flow. When applied in power systems, EPTs can improve power quality, enhance system stability, enable flexible power transmission, and allow real-time control of power flow under electricity market conditions.
Currently, apart from applications in intelligent microgrids with renewable energy, SSTs in traditional power grids are primarily used to address voltage disturbances in distribution networks.
Main reasons for using solid-state transformers (SST) include:
High Efficiency: SSTs offer higher efficiency than traditional transformers, typically exceeding 98%, thanks to semiconductor devices that enable highly efficient, low-loss power conversion.
Energy Saving and Environmental Protection: SSTs not only achieve higher efficiency but also allow more precise energy control and management compared to conventional transformers. This minimizes energy waste during conversion, reduces CO₂ emissions, and improves overall energy utilization.
Excellent Stability: SSTs exhibit high stability and reliability. They can adapt to various environmental changes and dynamic load conditions, while supporting flexible, programmable control to meet diverse application requirements.
Compact Size and Lightweight: Compared to traditional transformers, SSTs are smaller and lighter, offering significant advantages in space-constrained applications or where size and weight are critical.
Support for Smart Grid Development: SSTs enable high-precision energy measurement and data communication, facilitating distributed control and management in power systems. This supports energy optimization and management in smart grid environments.
In summary, solid-state transformers offer advantages such as high efficiency, energy savings, stability, and flexibility, positioning them to play an increasingly important role in future power systems—enabling more efficient, reliable, and intelligent grid operations.
