New Energy Solutions from QDTB
The global energy transition is accelerating, driven by falling renewable energy costs, carbon-neutrality targets, and growing EV adoption. This guide presents six integrated solutions from QDTB covering solar PV, wind power, energy storage, EV charging, microgrids, and green hydrogen.
Solution 1: Solar PV Power Station Transformers
Solar PV stations present unique requirements: high harmonic content from inverters, significant temperature cycling, remote outdoor installation, and high efficiency for maximum ROI.
- Step-up transformer (inverter output): 500–3,150 kVA, 0.27/35 kV, S13/S20 efficiency, harmonic-rated per IEEE C57.12.01 or IEC TR 60076-21
- Box-type substation: ZGS pad-mounted design, 1,000–2,500 kVA, integrating transformer with MV/LV switchgear
- Booster station: 10–50 MVA, 35/110 kV or 35/220 kV, ONAN/ONAF cooling
Design highlights: electrostatic shielding, reduced flux density (1.5–1.6T vs. standard 1.7T) for harmonic resilience, tropical-grade insulation up to 55°C ambient, C4/C5 corrosion protection per ISO 12944.
Solution 2: Wind Power Transformers
Wind farms require transformers that withstand severe vibration, wide load fluctuation, and harsh environments.
- Turbine step-up: 800–3,500 kVA, 0.69/33 kV or 0.69/35 kV, nacelle or tower-base mounting
- Collection substation: ZBW European-type, 500–1,600 kVA per unit
- Booster station: 20–100 MVA, 33/110 kV or 33/220 kV, with OLTC
Offshore requirements: 316L stainless steel IP66 enclosure, vibration-resistant core clamping, anti-condensation heating, Class H insulation, DNV GL type-tested.
Solution 3: Battery Energy Storage (BESS)
BESS transformers must handle bidirectional power flow, high harmonics, and frequent load cycling.
- PCS step-up: 1,000–3,150 kVA, K-13 or K-20 rated
- Compact substation: Integrated transformer + PCS breaker + MV switchgear
- Grid connection: 10–60 MVA, OLTC-equipped for large-scale storage
Key features: bidirectional thermal capacity, low zero-sequence impedance, enhanced short-circuit withstand, IEC 61850 smart monitoring.
Solution 4: EV Charging Stations
EV charging presents high peak demand, significant harmonics, and need for fast reliable power.
- Station transformer: 800–2,500 kVA, 10/0.4 kV or 35/0.4 kV, K-13 minimum
- Distribution: GCS/GCK LV switchgear with active harmonic filter
- Compact option: ZBW European-type for urban charging hubs
Design: 200% neutral conductor for triplen harmonics, K-factor rated, load management integration, modular expansion.
Solution 5: Microgrids
Microgrids combining solar, wind, storage, and backup require specialized transformers handling complex power flow, islanding, and seamless reconnection.
- Interconnection transformer: Phase-shifting or impedance-matching types
- Islanding switchgear: Synchronizing breakers with auto-transfer
- Power quality: Active filters and SVC integrated into distribution
Solution 6: Green Hydrogen Production
Electrolysis requires high-reliability transformers with specific rectifier load characteristics.
- Rectifier transformer: 2–30 MVA, 12-pulse or 24-pulse phase-shifting
- Distribution transformer: 500–2,500 kVA, K-20 to K-30 rated
Features: low stray flux, electrostatic shielding, 100% continuous + 150% short-term overload, dynamic load following with renewable generation.
Solution Summary
| Solution | Capacity | Key Standard | Special Requirements |
|---|---|---|---|
| Solar PV | 500 kVA – 50 MVA | IEC 60076 / IEEE C57 | Harmonic resilience, corrosion resistance |
| Wind Power | 800 kVA – 100 MVA | IEC 61400 + IEC 60076 | Vibration resistance, marine grade |
| BESS | 1 – 60 MVA | IEEE 1547 / IEC 62933 | Bidirectional flow, K-factor |
| EV Charging | 800 kVA – 2,500 kVA | IEC 61851 / IEEE C57 | K-factor, load management |
| Microgrid | 500 kVA – 10 MVA | IEEE 1547 | Islanding, power quality |
| Green Hydrogen | 2 – 30 MVA | IEC 60076-21 | Rectifier duty, low stray flux |
QDTB has delivered solutions for renewable projects across six continents with total installed capacity exceeding 5 GW.