Leveraging our core product strengths,we offer three key solutions to global clients:First,Smart Grid Optimization Solutions,which utilize recloser controllers and distribution automation systems to enable rapid fault location and automatic restoration, enhancing power supply reliability. Second, Industrial/Residential Energy Storage Solutions, tailored to diverse load demands, helping clients achieve peak shaving,backup power assurance,and energy cost control.Third,EV Charging Network Solutions,providing AC/DC charger selection, network design, and O&M services, compatible with regional standards like North America's NACS and Europe's CCS2. These solutions have been successfully deployed in factories,office buildings,residential communities,and public transport,effectively addressing customer pain points in energy utilization,power stability,and charging convenience.
Medium-Voltage Direct-Connect Ultra-Fast Charging Station
An SST-Based Solution for Next-Generation EV Charging
1. Industry Background and Pain Points
1.1 Industry Background
With more than 30 million EVs on the road, users now expect charging to feel like refuelling. That demand has driven the shift to ultra-fast charging (350 kW+, 800 V platform). But the conventional "transformer + charger" station architecture hits a systematic wall in power density, efficiency and utilisation of the grid connection.
1.2 Four Pain Points of Traditional Charging Stations
| Pain point | Description | Physical root cause |
|---|---|---|
| Slow charging | 30–60 minutes for a conventional fast charge | Power limited |
| Low efficiency | Whole-station efficiency of ~90% | Transformer + AC/DC multi-stage losses |
| Grid impact | Concentrated charging shocks the grid | No energy-storage buffer |
| Poor grid utilisation | Fixed transformer capacity | No peak-shaving capability |
1.3 Traditional vs. SST Direct Connection — the Physical Difference
Traditional charging-station chain
| Step | Equipment | Loss | In plain terms |
|---|---|---|---|
| ① | 10 kV → 0.4 kV transformer | 1%–2% | Steps the voltage down for supply |
| ② | AC/DC charging module | 3%–5% | Converts AC to DC for charging |
Total loss: ~5%–7%, whole-station efficiency of ~90%–93%.
SST direct-connect charging-station chain
| Step | Equipment | Loss | In plain terms |
|---|---|---|---|
| ① | SST solid-state transformer | 1%–2% | Directly connected at 10 kV with integrated rectification, in one step |
| ② | Direct DC busbar supply | Negligible | Multiple guns share one DC bus |
Total loss: ~2%–5%, whole-station efficiency of 94.5%–97.5%.
Physical root cause: SST medium-voltage direct connection removes the transformer, cutting charging-chain losses by 3–5 percentage points; the shared DC busbar lets multiple charging guns share power, improving utilisation.
2. Solution Overview and Value Proposition
2.1 Solution Definition (BLUF)
The SST direct-connect ultra-fast hybrid charging station delivers:
- MW-class extreme charging (100 km of range in 1 minute)
- Whole-station efficiency of 94.5%–97.5% (+3–5%)
- Grid utilisation of 83% → 120%
- World-first proven installation (CNPC Kunshan station)
2.2 Core Value Proposition
| Value dimension | Metric | Description |
|---|---|---|
| Power per gun | MW-class extreme charging | 100 km of range in 1 minute |
| Whole-station efficiency | 94.5%–97.5% | +3–5% vs. traditional |
| Grid utilisation | 83% → 120% | Peak-shaving with coupled energy storage |
| Charging terminals | Ultra-fast + liquid-cooled | Mixed multi-gun dispatch |
| Delivery time | 1 day | Proven at Kunshan |
3. System Architecture
3.1 System Topology (Layer by Layer)
① Medium-voltage connection: 10 kV incoming — with incoming protection and metering
② SST power core: 10 kV AC → multi-port DC busbar
③ Charging terminals: ultra-fast terminals (MW-class extreme charging, 100 km in 1 minute), liquid-cooled ultra-fast terminals (sustained high power), and an energy-storage coupling port (peak shaving)
④ Charging management: charger cluster control + EMS
| Layer | Composition | Power flow | Design rationale |
|---|---|---|---|
| ① Medium-voltage connection | 10 kV incoming | Grid → SST | Medium-voltage direct connection |
| ② SST core | DC busbar | 10 kV → Multi-port DC | One busbar, many guns, shared power |
| ③ Charging terminals | Ultra-fast + liquid-cooled + storage | DC → Vehicle | Mixed multi-gun dispatch |
| ④ Management | Cluster control + EMS | Information flow | Power-allocation optimisation |
3.2 How the Shared DC Busbar Works
In a traditional station, each charger has its own AC/DC stage and the powers are not shared. In the SST solution, all charging terminals share a single DC busbar, and the total power is allocated on demand — this is the physical basis of the "120% grid utilisation".
4. Core Equipment and Technical Parameters
| Parameter | Value | Physical significance |
|---|---|---|
| Power per gun | MW-class extreme charging | 100 km of range in 1 minute |
| Whole-station efficiency | 94.5%–97.5% | +3–5% vs. traditional |
| Grid utilisation | 83% → 120% | Peak-shaving with storage |
| Charging terminals | Ultra-fast + liquid-cooled | Mixed multi-gun |
| Delivery time | 1 day | Proven at Kunshan |
5. Technical Highlights and Physical Principles
5.1 Highlight 1: MW-Class Extreme Charging
- Physical principle: the SST medium-voltage direct connection provides an 800 V / 1000 V DC busbar, so the power per gun can reach MW class, breaking through the ceiling of the traditional 400 V platform.
- Quantified benefit: 100 km of range in 1 minute — an experience on par with refuelling.
5.2 Highlight 2: 120% Grid Utilisation
- Physical principle: with a coupled energy-storage port, the station charges storage at off-peak times and discharges at peak times; combined with PV, transformer capacity utilisation can exceed 100%.
- Quantified benefit: with the same transformer capacity, more vehicles can be served, improving ROI.
5.3 Highlight 3: One-Day Delivery
- Physical principle: modular factory pre-fabrication means the station is lifted into place and ready to use on site.
- Quantified benefit: the world-first Kunshan station was delivered in 1 day.
6. Economic Comparison with the Traditional Approach
| Cost item | Traditional | SST | Savings |
|---|---|---|---|
| Equipment investment | Baseline | −20% | Transformer eliminated |
| Footprint | Baseline | −40% | Much less civil work |
| Electricity (efficiency) | Baseline | +3–5% | Lower operating cost |
| Service capacity | Baseline | +20% (utilisation) | Higher revenue |
7. Landmark Project Reference
| Project | Key data | Significance |
|---|---|---|
| CNPC Kunshan station | 95%+ efficiency, −40% footprint, −20% investment, 1-day delivery | World-first installation |
8. Technical Standards and Compliance
| Standard | Scope | |
|---|---|---|
| GB/T 18487 | EV conductive charging | |
| GB/T 27930 | Charging communication protocol | |
| GB/T 34120 | Energy storage connected to the grid |
9. Delivery and Services
- Modular factory pre-fabrication
- One-day on-site delivery (proven)
- Full-lifecycle operation and maintenance with OTA upgrades
Deployed Equipment
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Reference Projects
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RW Energy Baoding 60 kWh 30 kW Energy Storage Integrated DC Fast Charging Station Success CaseAdopting an innovative integrated energy storage and fast charging architecture, this solution addresses insufficient grid capacity in urban built-up areas. Featuring a compact integrated design, full-range environmental adaptability and multi-vehicle compatibility, it enables lightweight deployment of energy replenishment stations in public parking lots, creating a replicable model for non-grid-expansion charging construction and distributed energy storage charging development in northern citie -
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RW Energy Hangzhou 12 Units 120 kW Integrated DC Fast Charging Station Success CaseClosely responding to the upgrading needs of Hangzhou’s urban charging network and focusing on high-frequency charging scenarios in core business districts, this solution deploys 12 sets of 120kW integrated DC fast charging units. Combining dynamic power allocation and industrial-grade protection technologies, it addresses the challenges of high concurrent usage, harsh outdoor conditions and unattended operation, empowering the construction of a convenient, efficient and intelligent urban chargi
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