Solid-State Transformer for Grid Integration
Development of a 100kVA solid-state transformer enabling bidirectional power flow and seamless renewable energy integration.
Role
Principal Engineer
Client
Smart Grid Research Initiative
Duration
18 months
Year
2024
Technologies
- ✓97.8% overall efficiency
- ✓Bidirectional power flow capability
- ✓Grid-forming and grid-following modes
- ✓80% weight reduction vs traditional transformer
- ✓Real-time power quality improvement
This flagship project focused on developing a solid-state transformer (SST) capable of replacing traditional line-frequency transformers while adding advanced grid support functionalities. The SST enables bidirectional power flow, voltage regulation, and reactive power compensation.
Architecture
The SST employs a three-stage architecture:
- AC-DC rectifier stage with active front-end
- Isolated DC-DC converter with high-frequency transformer
- DC-AC inverter stage for load-side voltage synthesis
Innovation Highlights
- Custom-designed high-frequency transformer operating at 20kHz
- Dual-active-bridge (DAB) converter for galvanic isolation
- Advanced thermal management using liquid cooling
- Grid-forming inverter capability for microgrid applications
Performance Metrics
The prototype demonstrated excellent performance across various operating conditions, including unity power factor operation, voltage sag compensation, and seamless transition between grid-connected and islanded modes.