Solar Solution

Solar Power Plant Solution

Complete transformer solution for utility-scale and distributed solar PV plants — from inverter step-up to grid connection. Multi-winding, harmonic-tolerant, outdoor-ready designs for 1–500 MW installations.

1–500 MW PV PlantsInverter / PCS Matched10–220kV Grid Connection
Application

System Architecture: Inverter to Grid

PV panels → String/Central inverter → Step-up transformer → Collection grid → Main step-up transformer → Grid connection. HUACHEN provides transformers at every stage.

Stage 1

Inverter Step-up (0.4–0.8kV → 10–35kV)

Multi-winding transformers matched to central or string inverters. 1–4 MPPT inputs, harmonic-tolerant winding design.

Stage 2

Collection Grid (10–35kV)

Pad-mount or compact substations collecting power from multiple inverter transformers. Switchgear + protection integrated.

Stage 3

Main Step-up (35kV → 110/220kV)

Main power transformer stepping up to grid voltage. OLTC, full type test, witnessed FAT.

Application

Customer Purchase Options

Option 1

Transformer Only

You have switchgear and enclosure. We supply the transformer to your spec.

Option 2

Transformer + Switchgear

Transformer matched with HV/LV switchgear, protection and monitoring.

Option 3

Pre-fabricated Box Substation

Complete substation: transformer + switchgear + enclosure, ready to install on site.

Option 4

Design & Selection Support

Our engineers help you select the right transformer, winding config, and capacity for your plant.

Engineering Data

Key Technical Parameters

Voltage range0.4/0.69/0.8kV → 10/20/35kV (step-up); 35kV → 110/220kV (main)
Capacity100–3150 kVA (inverter); 6.3–200 MVA (main step-up)
Multi-winding1–4 winding for multiple MPPT/inverter inputs, reduce transformer count
Box substation100–2500 kVA, transformer + HV/LV switchgear + enclosure, ready to install
Ambient temperature-25 to +50°C (derating above 40°C, +5°C per 100m altitude)
Altitude≤1000m standard, up to 4000m with derating
ProtectionIP54/IP55 outdoor (dust, rain); IP65 optional; salt-spray resistant coating
EnvironmentalSand/dust resistant, UV-resistant enclosure, anti-corrosion treatment
Grid codeIEC 60076, IEEE 1547, local utility requirements (e.g., GB/T 19964)
LossesLow-loss design; amorphous core option for no-load loss reduction
HarmonicsK-factor rated (K-4 to K-20), eddy-current loss controlled for THDi up to 30%
System & Equipment View

See how the solution fits together

A focused system view and one relevant equipment detail—without repeating the Hero image.

HUACHEN solar power transformer system coordination diagram
System Design Drawing

Solar Power System Coordination

Coordinated relationship between PV array, inverter, step-up transformer, protection and utility grid connection.

HUACHEN solar step-up transformer connection and cooling details
Equipment Detail

Solar step-up transformer detail

Connections, cooling and construction configured for inverter duty and outdoor renewable-energy service.

RECOMMENDED CONFIGURATION

Recommended transformer scope

Choose a proven starting point, then let our engineers adapt voltage, capacity, impedance, cooling, enclosure and documentation to the project.

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Have a solar project?

Send us your plant specification, inverter details, and site conditions. We’ll propose the right transformer configuration within 48 hours.

Request a Solution →
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