SST — Solid State Transformer

Product Overview

SST (Solid State Transformer), also known as Power Electronic Transformer (PET), is a next-generation power conversion device based on power electronics technology. Unlike traditional iron-core transformers, SST achieves voltage transformation through high-frequency isolation, offering significant advantages including compact size, lightweight design, strong controllability, and flexible AC/DC conversion capabilities. It stands as one of the core pieces of equipment for building the new power system.

Key Advantages

✓  Flexible AC/DC conversion — multi-function in one unit

✓  End-to-end efficiency ≥ 98.5%, >30% lower losses vs. traditional solutions

✓  Volume and weight only 1/3 ~ 1/5 of conventional transformers

✓  Millisecond-level power regulation with bidirectional flow control

✓  Built-in power quality management (reactive/harmonic/unbalance)

✓  Plug-and-play ready, easy integration into microgrid systems

Typical Application Scenarios

▸ Scenario 1: Data Center / Intelligent Computing Park Power Supply

Data center / intelligent computing park: power efficiency, space utilization, green power compatibility, IDC high reliability, 800V DC, PUE optimization, harmonic mitigation, fire safety compliance.

SST delivers efficient power solutions for data centers and intelligent computing parks: 800V DC bus direct supply reduces conversion stages; compact design saves floor space; built-in power quality management ensures IT equipment stability; supports green power direct connection, optimizing PUE below 1.2; compliant with data center fire safety regulations.

▸ Scenario 2: Ultra-Fast Charging Network (>1 MW)

>1 MW ultra-fast charging, shorten charging time, improve efficiency.

For megawatt-class ultra-fast charging stations, SST provides efficient AC/DC conversion, dramatically shortening EV charging times, improving charging efficiency, and reducing operating costs. Supports multi-gun parallel current sharing, adaptable to future ultra-high-power charging demands.

▸ Scenario 3: SST + Integrated PV & Energy Storage System

Supports flexible AC/DC conversion, eliminating multi-stage conversion steps in PV-storage grid connection; end-to-end efficiency ≥ 98.5%; over 30% lower power loss compared to traditional transformer solutions; a 200 MW PV-storage project can save more than RMB 10 million in electricity costs annually. Bidirectional dispatch with millisecond-level response: precisely smooths PV generation fluctuations, efficiently supports storage peak shaving and valley filling, effectively solving curtailment and voltage instability issues, increasing PV self-consumption rate to above 85%.

Deep integration of SST with photovoltaic and storage systems forms a "PV-Storage-DC-Flexible" solution. Eliminating multi-stage DC/AC-AC/DC conversion found in traditional approaches, end-to-end efficiency exceeds 98.5%. A 200 MW PV-storage project can save over RMB 10 million annually in electricity costs. Millisecond-level bidirectional dispatch precisely smooths PV output fluctuations, raising self-consumption rates above 85%.

▸ Scenario 4: SST + Long-Duration Energy Storage (4+ Hours)

Deep integration of SST with long-duration energy storage (4h+), fully adapted to high-end applications such as zero-carbon parks, intelligent computing centers, and green hydrogen production; driving the implementation of "source-grid-load-storage" integration; serving as the core neural hub of the new power system, supporting high-quality industry development.

Paired with long-duration storage systems (4h+), SST becomes the core energy router for zero-carbon parks, intelligent computing centers, green hydrogen production, and other premium scenarios. As the "neural hub" of the new power system, SST achieves coordinated source-grid-load-storage optimization, driving the industry's green, low-carbon transition.

▸ Scenario 5: DC Distribution Network / AC-DC Hybrid Microgrid

SST in DC distribution network / AC-DC hybrid microgrid, green power direct connection.

In DC distribution networks and AC-DC hybrid microgrids, SST serves as a key interconnection node, enabling flexible interconnection and power decoupling control between AC grids and DC microgrids. Supports green power direct connection, maximizing renewable energy utilization.

▸ Scenario 6: Rail Transportation Power Supply

SST in Rail transportation: substation power supply, on-train power supply (replace industrial frequency transformer).

Applied in rail transportation: serves as the main transformer for traction substations, replacing bulky industrial-frequency transformers; can also be installed onboard trains to replace onboard industrial-frequency transformers, significantly reducing train weight, saving space, and improving energy efficiency.

▸ Scenario 7: Electric Vessels (Shore Power & Shipboard Distribution)

Marine electric vessels: shore power application, medium-voltage DC integrated power distribution.

Targeting the electric vessel sector, SST is used in shore power connection systems and shipboard medium-voltage DC integrated power distribution systems. Supports clean shore power supply during port calls and efficient power distribution management during navigation, aiding the maritime industry's decarbonization transition.

▸ Scenario 8: Intelligent Building Power Supply

Intelligent building power supply.

In intelligent buildings, SST acts as the building microgrid's energy hub, integrating rooftop PV, energy storage systems, EV charging piles, and DC loads, achieving building energy self-balance and optimal scheduling — creating truly "net-zero energy consumption" buildings.

Figure: SST solid state transformer application scenario overview

Technical Specifications (Summary)

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