Description

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Product Description

• Turnkey medium-voltage PV inverter station engineered for large grid-connected solar power plants, supporting up to approximately 4.48 MVA AC output.

• Based on Sungrow’s SG4400UD-MV platform with advanced three-level inverter technology for high efficiency and reliability.

• Designed for high-voltage DC 1500 V PV input systems and multiple independent MPPTs to optimise energy yield.

• Integrated MV transformer (stepping inverter AC to 22 kV), switchgear, and LV auxiliary supply housed in a 20-foot outdoor container for simplified installation and maintenance.

• Provides grid-compliant support functions including low/high voltage ride-through, active and reactive power control, and power ramp-rate management.

• Includes comprehensive protection features such as DC input protection, AC output protection, surge protection, ground-fault and insulation monitoring.

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Technical Specifications

DC (PV) Input

• Maximum PV input voltage: 1500 V DC.

• MPP voltage range: 895–1500 V.

• Number of independent MPPTs: 4.

• DC input configuration: up to 20 inputs (optional 28).

• Maximum PV input current: 4 × 1435 A.

AC (Output) / Power Ratings

• Rated AC output power (inverter): ~4400 kVA @ 45 °C.

• Maximum AC output power: up to ~5060 kVA (lower ambient temperatures).

• Nominal medium-voltage output: configurable between 10 kV and 35 kV (here set at 22 kV).

• Maximum AC current: ~292.2 A.

• Power factor (nominal/adjustable): > 0.99 / 0.8 leading – 0.8 lagging.

• Grid frequency: 50 Hz (45–55 Hz) or 60 Hz (55–65 Hz).

Efficiency & Performance

• Maximum inverter efficiency: ~99 %.

• European efficiency: ~98.7 %.

• Total harmonic distortion (THD): < 3 % at nominal power.

Transformer & Grid Interface

• MV transformer: integrated with station; LV/MV step-up to 22 kV.

• Transformer vector group: typically Dy11.

• Cooling type: ONAN (oil natural, air natural).

Protection & Grid Support

• DC input protection: load switches and fuses.

• AC output protection: circuit breakers on inverter and MV side.

• Surge protection: DC/AC Type II.

• Ground-fault and insulation monitoring.

• Low/high voltage ride-through (L/HVRT).

• Active/reactive power control and ramp-rate control.

Physical & Environmental

• Containerised outdoor design: ~6058 mm × 2896 mm × 2438 mm.

• Weight: ~20 000 kg.

• Protection class: Inverter IP65; other components IP54.

• Operating ambient temperature: −35 °C to +60 °C.

• Relative humidity: 0 %–100 %.

• Cooling method: temperature-controlled forced air.

• Maximum standard operating altitude: ~1000 m (higher with optional configuration).

Communications & Monitoring

• Display: LED indicators and/or WebHMI.

• Interfaces: RS485, Ethernet.

Compliance & Standards

• Certified to CE and international standards including IEC 62109, IEC 61727, IEC 62116, IEC 62271-202, IEC 62271-200, and IEC 60076.