The future of power distribution —
built on silicon
Solid-State Transformer
HIITIO SST eliminates line-frequency transformers across the entire power supply chain — delivering cleaner energy, higher efficiency, and flexible AC/DC hybrid integration for data centers, EV charging, renewables, and industrial microgrids.
Product overview
What is a solid-state transformer?
Solid-State Transformer (SST), also known as Power Electronic Transformer (PET), is a new-generation transformer device based on power electronic conversion and high-frequency magnetic isolation.SST can provide voltage transformation, electrical isolation, AC/DC conversion, bidirectional power flow control, power quality management, and interfaces for renewable energy and energy storage.
It is suitable for high-density data centers, AI computing centers, megawatt-level EV charging and battery swapping stations, AC/DC hybrid distribution networks, wind-solar-storage integration, smart microgrids, and integrated generation-grid-load-storage systems.
Why Choose SST
Why Choose SST Over Traditional Power Supply Systems?
Traditional power supply systems usually consist of multiple devices such as line-frequency transformers, rectifiers, inverters, UPS systems and power quality equipment. The power chain is long, the equipment footprint is large, and conversion losses are high. SST integrates multiple functions into one system through power electronics and modular architecture, helping customers reduce system complexity, improve power supply efficiency and prepare for future DC distribution, renewable energy access and intelligent operation.
Reference Technical Parameters
Specifications vary by application
- Frame: Power electronic conversion + high-frequency magnetic isolation + intelligent control
- Capacity: 1.2MW–5MW (flexible capacity expansion)
- Input Voltage: 10kV/13.8kV/35kV (Customized)
- Output Voltage: 240VDC/400VDC/750VDC/ 800VDC/ 1000VDC; 380VAC-Auxiliary power supply(Customized)
- Cooling Method: Fan (Customized)
- Dimension: 20GP (Customized)
Technical advantage
Built for peak performance — efficiency you can measure
HIITIO SST combines soft-switching technology and multi-field magnetic optimization to deliver industry-leading efficiency with minimal losses.
Efficiency
SST peak efficiency: >97.5%
High-efficiency power semiconductors combined with ZVS soft-switching minimize switching and conduction losses — verified peak efficiency of 97.5%, vs. 85.8% for UPS-based systems
Reference: For a 10 MW data center, the SST solution saves 28.11 million kWh over 10 years compared to UPS solutions.
Modularity
Modular scalable architecture: 1.2MW–5MW
Cascaded modular topology with flexible 1.2MW–5MW capacity expansion per cabinet. Module-level fault redundancy (25% equipment redundancy) ensures automatic bypass of any failed module — no system downtime. THDi <2% under cascaded grid connection.
Losses
Zero no-load loss — 24/7 savings
Conventional line-frequency transformers carry ~1% no-load losses continuously, even at zero output. HIITIO SST has zero no-load loss. Combined with intelligent fan speed control, total auxiliary losses are minimized across all operating conditions.
Deployment
Factory-tested components
Every HIITIO HVDC contactor, semiconductor fuse, and power module is tested to specification before shipment — contact resistance, dielectric withstand, and I²t verification included. Standard catalog items ship within 4–8 weeks.
Specify HIITIO Components for Your Next SST Program
Request samples, datasheets, or a one-on-one application review with our power electronics engineering team.
Six Reasons SST Is the Future of Power Distribution
Why Solid-State Transformers Outperform Conventional Distribution Equipment?
From efficiency and compactness to intelligent energy routing — HIITIO SST consolidates what traditional transformers, UPS systems, APF units, and rectifiers do separately into a single, controllable power conversion platform.
Multi-Scenario Integration
It can serve as an energy interface among renewable energy, energy storage, DC loads and the grid, enabling unified and flexible access for wind, solar, storage and loads.
Compact High-Frequency System
High-frequency design replaces power-frequency stages for a more compact footprint，60% footprint saving.
Intelligent Modularization
Modular architecture supports flexible 1.5MW–3MW capacity expansion, while plug-and-play modules simplify maintenance and future upgrades.
Medium-Voltage Direct DC Supply
It can directly convert medium-voltage AC power into DC output, reducing multiple conversion stages in traditional power supply chains and improving system integration.
Power Quality Management
With cascaded grid connection and high-performance waveform control, it supports low harmonic distortion, reactive power compensation, harmonic mitigation and bidirectional power flow control.
Integrated Design
Integrated cabinet or prefabricated design reduces 75% on-site construction workload, shortens project delivery time, and simplifies transportation, installation and commissioning.
Where our components are used
SST Application Environments
From AI data centers to EV supercharging and utility-scale renewable integration.
IDC power supply
Medium-voltage direct DC supply — the new standard for data center power
HIITIO’s SST-based data center power solution eliminates line-frequency transformer stages. A single pre-integrated cabinet steps medium-voltage AC (10 kV) directly to low-voltage DC — no oil-cooled transformer, no phase-shifting transformer, no separately commissioned APF/SVG.
EV charging
Medium-voltage DC direct supply — simplifying the EV charging power chain
HIITIO SST replaces the conventional charging architecture with a direct medium-voltage DC bus, eliminating multiple conversion stages and reducing 380 V AC line losses (which are ~6× higher than 1 kV DC losses). Supports native PV/storage integration and V2G bidirectional flow.
AC/DC hybrid distribution networks
Flexible grid interconnection — one SST bridges the AC and DC worlds
Traditional distribution networks are built entirely on AC. But by 2050, an estimated 70% of end-use loads will be inherently DC — EV chargers, battery storage, server racks, LED systems, and variable-speed drives. Running these loads through multiple AC/DC conversion stages wastes energy at every step and makes coordinated control across generation, grid, load, and storage nearly impossible.
HIITIO SST resolves this by acting as a flexible power router at the distribution level — providing simultaneous AC and DC ports at different voltage levels, active power flow control at each port, and native integration for wind, solar, storage, and DC loads without additional conversion equipment.
Solar PV integration
Grid-forming PV integration — direct DC connection from solar to grid
HIITIO’s grid-forming SST topology provides voltage support, active inertia, and DC aggregation at the collection point, connecting PV arrays directly to a DC bus before a single efficient step-up stage. Eliminates line-frequency transformer stages and overnight reactive power losses.
Smart microgrids
The power router — energy management hub for net-zero industrial parks
HIITIO’s Power Router provides multiple AC/DC interfaces at different voltage levels, actively controlling power flow at each port as a regional energy management agent — the ideal platform for zero-carbon industrial parks and large-scale renewable integration.
Specifications
Key Specifications at a Glance
| Parameter | Data Center SST | EV Charging SST | PV Grid SST |
|---|---|---|---|
| Rated power | 2.4 MW (expandable to 3 MW) | 2.4 MW (expandable to 3 MW) | 3–4 MW per unit |
| Input voltage | 10 kV AC, 3-phase | 10 kV AC, 3-phase | 10 kV / 35 kV AC |
| Output voltage | 240–275 V DC / 800 V DC | 400–800 V DC | 1 kV DC (collection bus) |
| Peak efficiency | >97.5% | >97.5% | >97.6% |
| Input THDi | ≤2% @ 50–100% load | ≤3% @ 50–100% load | ≤3% (full load) |
| Power factor | ≥0.99 @ 50–100% load | ≥0.99 @ 50–100% load | ≥0.99 |
| Module redundancy | 25% (hot standby) | 25% (hot standby) | IPOP redundant design |
| Cooling | Forced air | Forced air | Forced air |
| Commissioning | ~20 days (pre-fabricated) | ~20 days (pre-fabricated) | Prefab cabin ≤12×3×2.9 m |
Frequently asked questions
SST Component Questions — Answered
What is the difference between SST and a traditional transformer?
Traditional transformers mainly provide line-frequency voltage transformation and isolation. SST uses power electronic conversion and high-frequency isolation to provide voltage transformation, rectification/inversion, DC interfaces, bidirectional power flow and power quality control.
Can SST Step Up & Step Down voltage?
Yes. The SST enables bidirectional step-up and step-down voltage conversion for photovoltaic and energy storage applications, supporting flexible power flow between PV generation, energy storage systems, loads, and the grid.
Can SST be customized?
The system can be designed according to project requirements such as input voltage, output voltage, capacity, interface quantity, cooling method, installation environment and communication/control needs.
Why can't I use standard AC contactors for the DC bus in an SST system?
DC arcs do not extinguish at a natural current zero the way AC arcs do. Standard AC contactors lack the arc quench geometry, contact gap, and chamber materials to interrupt DC currents reliably above 500 V. Attempting this risks contact welding, sustained arcing, and fire. HIITIO HCF series contactors are specifically designed for DC arc extinction up to 1500 V.
How do I match a semiconductor fuse to the IGBT or SiC module it is protecting?
The primary matching parameter is I²t (joule integral). The fuse’s let-through I²t must be lower than the module’s withstand I²t. The fuse voltage rating must exceed the DC bus voltage including transient overshoot, and the continuous current rating must exceed the module’s maximum current with temperature derating. HIITIO’s application engineering team can assist with this calculation.
Can you provide application support during SST system design, not just component supply?
Yes. For qualified OEM customers: component selection review based on your topology and bus voltage; I²t coordination review for fuse-module matching; gate driver PCB layout review for high dV/dt environments; and sample provision for design-in testing.
Ready to Specify HIITIO Components for Your SST System?
Our application engineering team is ready to review your topology, match specifications, and ship samples within 2–4 weeks.
HIITIO is a global supplier of power electronics components for solid-state transformer systems — specializing in HVDC contactors, semiconductor fuses, IGBT and SiC power modules, and gate drivers. Backed by in-house manufacturing, IEC-compliant testing, and dedicated application engineering, HIITIO provides the protection and switching components that make SST systems reliable across data centers, EV charging infrastructure, renewable integration, and AC/DC hybrid distribution networks.
IEC 62271 / IEC 60269 / IEC 60747 Compliant
HVDC contactors rated up to 1500 V DC / 400 A
Semiconductor fuses with fault response
SiC and IGBT modules matched
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