Agricultural Photovoltaic Complex Power Generation Project Case in Lingao County, Hainan Province

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Aerial view of Lingao Nongguang Project in Hainan Province

The case of Agricultural Photovoltaic Compound Power Generation Project in Lingao County, Hainan Province successfully combines photovoltaic power generation with agricultural cultivation. By installing solar photovoltaic panels above the farmland, it realizes power production without hindering the growth of crops, effectively utilizes the land resources, improves the added value of agriculture, and at the same time, promotes the development of local green energy, realizing win-win situation in terms of economic benefits and environmental protection.

I. Project Background

1. Local demand

Lingao County, Hainan Province, as a large agricultural county in Hainan Province, has flat and fertile land resources, but the traditional agricultural efficiency is low, while facing the pressure of energy structure transformation, combined with a 12% increase in electricity consumption in the county by 2023, the gap of clean energy is significant, so the local government urgently needs to carry out the adjustment of the energy structure.

2. Policy Driven

Hainan Province's “14th Five-Year Plan” clearly requires that the proportion of renewable energy reach 50% in 2025, and agricultural PV complementary projects can enjoy provincial subsidies of 0.42 yuan/kWh. Under the strong impetus of this policy, Lingao County has decided to adopt solar photovoltaic projects for energy support.

II. Core Objectives

Dimensions	Indicators
‌Energy Efficiency	Average annual power generation 143 million kWh
‌Ecological Benefits	CO₂emission reduction of 123,500 tons/year
‌Agricultural Income	Increase the comprehensive utilization rate of land by 300%
‌Employment Driven	Creation of 200 seasonal jobs

III. Implementation Program

1. Space reuse design

Agricultural photovoltaic composite power generation is designed as a three-dimensional photovoltaic architecture, using the “624” technical specifications, photovoltaic panels 3 meters from the ground, the planting area to maintain the light intensity of more than 12,000 lux to meet the needs of leafy vegetable crop growth.

For the selection of photovoltaic modules, the use of 550W monocrystalline silicon modules installed flat, plate spacing 1.5 meters reserved for mechanical cultivation channel.

2. Grid access program

The project is designed to build 28 power generation units, configured with 250kW string inverters, which are connected to Honghua substation through 10kV lines. Acrel-1000DP monitoring system is deployed in the project to realize real-time monitoring of power generation efficiency and equipment status.

3. Agricultural power synergy mechanism

For the land transfer strategy, a 20-year lease agreement was signed with Hongxing Farm at a rent of RMB 1,500/mu/year.

Introducing planting management technology and cooperating with the operation of professional agricultural companies, planting shade-resistant crops such as hollow cabbage and groundnut leaves, with a yield of up to 3,000kg/mu/quarter.

Scene of solar panel laying in Lingao County Agricultural Photovoltaic Project

Ⅳ.Commissioning and Operation and Maintenance

1. System Coordination

The project carries out a 72-hour full-load test to verify that the response time of the backflow prevention device is within 200ms. It also calibrates the shadow shading algorithm to ensure that the average daily effective power generation time exceeds 4.2 hours.

2. Intelligent Operation and Maintenance System

Technology Module	Function realization
Drone Inspection	Automatically generate weekly component hot spot reports
AI Yield Prediction	Accuracy greater than 85% based on historical weather data
Mobile Operation and Maintenance	Fault response time reduced to less than 2 hours

V. Risk Control

1. Natural disaster response

As there are many typhoons passing through Hainan Province every year, referring to the defense standard of Typhoon Wilson in 2024, the wind resistance level of the entire PV project's racking structure has been upgraded to Grade 12, and the tightening torque of bolts has been increased by 20%. The drainage ditch system is also constructed to withstand rainstorms that occur once every 50 years.

2. Agricultural compatibility optimization

The dynamic adjustment of PV panel tilt angle (10°-15°) of solar PV panels increases light transmission by 15% during rainy season. It also establishes a soil moisture monitoring station to prevent salinization of the land under the panels.

VI. Comprehensive Benefits

1. Economic benefits

The projected income from electricity, with subsidies included, is 32 million RMB per year from the sale of electricity.

In terms of agriculture, the annual sales of vegetables exceed RMB 8 million in value added.

In terms of cost recovery of the whole PV project, it is expected that the IRR reaches 11.8% and the payback period is 7.2 years.

2. Social Value

The PV project has driven six neighboring villages to participate in the industry chain, with an average annual income increase of 12,000 RMB for farmers.23 The project has become one of the first batch of “PV+Rural Revitalization” demonstration projects in Hainan Province, and has received 120 batches of study tours/year.

Hainan Lingao County 60mw Agro-photovoltaic Complex Project Energy Storage System

Project Revelation

Through the mechanism of “spatial reuse-intelligent control-benefit sharing”, this agricultural PV compound power generation project in Lingao County, Hainan Province, realizes the triple value of energy production, agricultural efficiency and ecological improvement on 886,000 square meters of land, which provides a replicable “Lingao model” for agricultural PV complementary projects in tropical areas. “Lingao model”.

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