In recent years, as a leader in the field of renewable energy, the photovoltaic industry has been widely used around the world for its clean, efficient and renewable characteristics. At the same time, traditional breeding industry is also facing problems such as environmental pollution, high resource consumption and low production efficiency. Therefore, combining photovoltaics with breeding industry can not only effectively utilize idle roof and land resources, but also reduce breeding costs, improve production efficiency and achieve green transformation.
Although the photovoltaic + breeding model has many advantages, its development also faces some challenges. Among them, the intermittent and volatile nature of photovoltaic power generation is one of the biggest problems. Due to the uncertainty of light intensity and sunshine time, photovoltaic power generation often fluctuates greatly. This requires that when the photovoltaic power generation is insufficient, the farm can have sufficient power reserves to ensure the normal operation of breeding equipment and the healthy growth of animals. At this time, the importance of energy storage system technology is highlighted.
Energy storage technology refers to the technology of storing energy in the form of electrical energy, thermal energy, chemical energy, etc., and releasing it for people to use when needed. According to the different energy storage media, energy storage technology can be divided into mechanical energy storage, electromagnetic energy storage, chemical energy storage and thermal energy storage. In the photovoltaic + breeding mode, commonly used energy storage technologies mainly include lithium-ion battery energy storage, lead-acid battery energy storage and supercapacitor energy storage. The application of energy storage technology in photovoltaic + breeding is mainly reflected in the following aspects.
Smoothing power fluctuations: The energy storage system can smooth the fluctuations of photovoltaic power generation, ensuring that the farm can still obtain a stable power supply when the photovoltaic power generation is insufficient at night or when the light is insufficient. This can not only ensure the continuous operation of breeding equipment, but also provide animals with a stable growth environment such as light and temperature.
Peak shaving and valley filling: The energy storage system can achieve peak shaving and valley filling of electricity, that is, charging and storing electricity during the low electricity price period, and discharging and supplying electricity during the peak electricity price period. This can not only reduce the electricity cost of the farm, but also improve the stability and reliability of the power grid.
Emergency standby: The energy storage system can be used as an emergency power supply to provide uninterrupted power supply to the farm in the event of an emergency such as an unexpected power outage. This helps to reduce the losses caused by power outages and ensure the normal operation of the farm.
The energy storage + breeding mode is an innovative practice that combines energy storage technology with the photovoltaic + breeding mode. This model not only inherits all the advantages of the photovoltaic + breeding model, but also further improves the stability and reliability of the system by introducing energy storage technology, providing more powerful support for green transformation. Through the combination of photovoltaic power generation and energy storage technology, it is possible to replace and reduce traditional energy, thereby reducing carbon emissions and environmental pollution.
At the same time, the energy storage system can also be used as an emergency power supply to provide uninterrupted power supply to the farm in emergencies such as natural disasters, reducing losses caused by power outages. In terms of economic benefits, the energy storage + breeding model also has significant advantages. It can not only achieve peak shaving and valley filling of electricity, but also reduce the electricity cost of the farm. It can also improve breeding efficiency and production benefits, bringing more economic benefits to the farm.
1. Farm + Photovoltaic Practice Cases
Around the world, practical cases of energy storage + farming model continue to emerge. BOE Energy Sunite Right Banner 200,000 kW Pastoral Photovoltaic Storage Comprehensive Demonstration Project, with a total investment of 960 million yuan, covers an area of 7,000 mu, and has built a photovoltaic power station with a total installed capacity of 200,000 kW and a 220 kV booster station, which can produce 340 million kWh of green electricity annually.
The project not only realizes the organic combination of photovoltaic power generation and animal husbandry, but also ensures the stability and reliability of the system by introducing energy storage technology. The project uses lithium iron phosphate materials with high energy density and fast charging and discharging speed as the battery cell, and designs a total of 17 energy storage warehouses. The number of charging and discharging times in the whole life cycle exceeds 6,000 times, and the power scale is the largest energy storage system in Ximeng area. The successful practice of this model provides a strong demonstration effect for the promotion of the energy storage + farming model.
2. Thermal energy storage chicken farm practice case
Ningxia Dadi Digital Agriculture Industrial Park broiler farm is located on the west side of Sikouzi Road, Xuanhe Town, Shapotou District, Zhongwei City, Ningxia. It mainly breeds meat chickens. The total construction area of Phase 1 is 111,760 square meters, and the actual usable area is 100,000 square meters, with a total of 58 breeding greenhouses.
The area of a single greenhouse is 1,708 square meters, 122m long × 14m wide × 3.5m high. The enclosure structure uses double-layer polyethylene insulation, which has a good insulation effect. The first heating required is 40 greenhouses, with a total area of 68,320 square meters. In order to ensure the effect of broiler breeding, Party A requires the temperature in the shed to be 35℃, and the breeding cycle is 40 days. The temperature in the shed is required to be 35℃ for the first 15 days, 30-28℃ for the middle 15 days, and 28-25℃ for the last 10 days after the chickens grow into big chickens. The indoor temperature is required to be automatically adjusted to ensure that the temperature in winter is suitable, the broilers grow fast, are not injured, and have a high survival rate. After many considerations, the engineering company selected and designed a combination of air source heat pump centralized heating + ultra-large-scale energy storage system. The ultra-large-scale energy storage system greatly reduces the unit configuration. This project is equipped with 33 ultra-low temperature hot and cold air source heat pump heating and cooling groups, with a nominal heating capacity of 121KW per unit, a total heating capacity of 3993KW, a single input power of 52.3KW, and a total input power of 1726KW.
Thanks to the large-capacity energy storage and good insulation of double-layer polyethylene in the shed, the unit area heat load index of the project is only 58W/㎡. The energy storage system is equipped with a single energy storage tank with a single capacity of up to 1,000 tons. The air source heat pump is the main heat source to increase the heat of the water in the energy storage tank. The energy storage tank stores the heat and provides centralized heating according to the actual load in the shed. The terminal floor heating pipe runs on the wall and the fan coil unit is used. The heating is uniform and has no fluctuations, reaching the temperature required by chicken farmers.
3. Energy storage + fish farming
There are nearly 50,000 fish farmers in Ningde City, Fujian Province, and about 1.2 million fish farming cages. In the past, nearshore fish farmers used cables from the shore to supply electricity, but this method has problems such as high cable investment and maintenance costs, low reliability, illegal power supply price increases, and greater safety hazards. Now, more than half of the fish farmers use "photovoltaic + energy storage" to use electricity. The energy storage system combines photovoltaic power generation, wind power generation and digital energy management systems to achieve uninterrupted power supply for offshore fish rafts.
The Three Gorges Dongshan Xingchen Photovoltaic Project is a pilot demonstration project for renewable energy development in Fujian Province. It is located in the sea area of Xingchen Town and Qianlou Town, Dongshan County, with a total investment of 1.06 billion yuan, a planned site area of about 3,300 acres, and a planned installed capacity of 180MW. It is planned to build a 110kV booster station and a supporting 18MW/36MWh energy storage station. The project can save 90,000 tons of standard coal per year, reduce nitrogen oxides, carbon dioxide, and sulfur dioxide by about 100 tons, reduce smoke emissions by 6.6 tons, and increase power generation by 5%-10% compared with land-based photovoltaics, further enhancing the environmental benefits of photovoltaic power generation.
As an upgraded version of the photovoltaic + breeding model, the energy storage + breeding model not only inherits all the advantages of the photovoltaic + breeding model, but also further improves the stability and reliability of the system by introducing energy storage technology. The successful practice of this model provides more powerful support and demonstration effect for green transformation. In the future, with the continuous innovation and upgrading of energy storage technology and the government's increasing support for renewable energy and green development, the energy storage + breeding model will usher in a broader development prospect.
