I. Core Project Pain Points

1. Unreasonable DC/AC ratio in large-scale power plants, low inverter utilization and substandard power generation.

2. Non-standardized matching among modules, inverters, cables and mounting structures, leading to high O&M costs and major safety hazards.

3. Inaccurate land area estimation and low land utilization rate.

4. Mismatch between solar irradiance resources and system design, resulting in low PR value.

5. Excessive cable power loss and over-limit voltage drop, causing hidden power generation loss.

6. Improper selection of mounting structures for terrain, wind load and snow load, leading to high structural safety risks.

II. Expert Overall Solution (110MW AC Side)

• System voltage class: 1500V

• Grid-connected rated capacity: 110MW AC

• DC side installed capacity: 137.5MWp

• Recommended DC/AC ratio: 1.25: 1

• System efficiency (PR): 81%–85%

• Applicable standards: GB 50797, IEC 61724, IEC 61730, grid connection standards

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III. PV Module Configuration

Selected Models

• Single/Double-sided modules: 550Wp / 580Wp

• Type: Monocrystalline PERC / TOPCon

• Efficiency: 21.0%–22.5%

Quantity Calculation

• 550Wp:

  Total modules = 137500000 ÷ 550 = 250,000 pcs

• 580Wp:

  Total modules ≈ 237,069 pcs

String Design

• Modules per string: 26 pcs

• String power: 550W × 26 = 14.3kW

• Operating voltage: 850–1000V

• Open-circuit voltage: ≤1500V (safe for low-temperature conditions)

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IV. Inverter Configuration (Two Mainstream Solutions)

Solution A: Central Inverter (Flat & Large Sites)

• Unit power: 3.125MW

• Quantity: 35 units

• Total AC output: 109.375MW (close to 110MW)

• Efficiency: ≥98.7%

• Protection: IP65

Solution B: String Inverter (Mountain & Complex Terrain)

• Unit power: 312.5kW

• Quantity: 352 units

• Multi-channel MPPT, suitable for complex scenarios with shading and slopes

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V. Mounting System (Full Model & Quantity)

1. Mounting Type

• Fixed mounting: Aluminum alloy / Hot-dip galvanized steel C-channel

• Type: Fixed-tilt mounting (optimal tilt 22°–38°, based on latitude)

• Protection: Hot-dip galvanizing ≥65μm, anti-corrosion for 25 years

2. Mounting Quantity & Weight

• Taking 550Wp modules as example:

• 1MWp requires approx. 40–45 tons of mounting structures

• 137.5MWp requires approx. 5500–6200 tons

• Layout: 2×2 or 4×1 arrangement

• Total mounting units: approx. 9,600 sets

3. Applicable Scenarios

• Plain/Gobi: Fixed mounting is optimal

• Mountainous area: Adjustable mounting / short-column mounting

• High-wind area: Reinforced mounting, wind resistance ≥36m/s

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VI. Cable Selection & Cross-Section Area

1. DC Cable (PV1-F Special PV Cable)

• String to combiner box / inverter:

• Specification: 1×4mm² / 1×6mm²

• Recommendation: 6mm² for lower power loss

• Total DC cable length: approx. 1800–2200km

2. AC Cable (Copper Core YJV22 Armoured)

• Inverter to box-type transformer:

• Specification: 3×120mm² / 3×150mm² / 3×185mm²

• Box-type transformer to booster station:

• 35kV HV cable: YJV22-26/35kV-3×150/185mm²

• Total AC cable length: approx. 60–80km

3. Design Principles

• DC power loss: ≤2%

• AC power loss: ≤1.5%

• Voltage drop: ≤3%

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VII. Land Occupation

1. Land Area

• 1MWp land occupation: 6.5–8 mu (flat ground)

• 137.5MWp total land occupation:

  ≈ 890–1100 mu

  Equivalent to: ≈ 59.4–73.3 hectares

2. Site Requirements

• Terrain: Priority for flat land, gentle slope, gobi, barren hill, coal mining subsidence area

• Slope: ≤25°

• Shading: No long-term shading

VIII. Solar Irradiance Conditions

1. Applicable Resource Zones

• Annual total irradiation: 1200–1800 kWh/m²/year

• Peak sun hours: 3.3–5.0h/day

2. Estimated Power Generation (110MW AC)

• Annual power generation:

  ≈ 145–175 million kWh

IX. Box-Type Transformer & Boosting System

• Box-type transformer: 35kV 3.15MVA

• Quantity: 35 units

• Booster station: 110kV primary boosting

• Power factor: ≥0.95

• Configuration: SVG dynamic reactive power compensation

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X.Solution Advantages

1. Full-chain expert-level matching, no bottlenecks or waste.

2. Optimal design in line with national standards for power loss, voltage drop and DC/AC ratio.

3. Power generation 8%–12% higher than conventional solutions.

4. Safe and stable operation for 25 years, low operation and maintenance cost.

5. Suitable for all global irradiation zones, terrains and grid standards.

6. One-stop solution available: design, supply, EPC, O&M.