With the continuous decline in the cost of battery energy storage in recent years, in the integrated development model of photovoltaics and many fields, “photovoltaic + energy storage” has become a global development trend and one of the hottest development paths in the industry in the future. From the demonstration stage in 2007 to the full-scale outbreak in 2013, my country’s photovoltaic market has completed the development process of rapid technological development and continuous reduction of electricity prices. The data shows that in 2019, the cumulative installed capacity of photovoltaics in my country was 204.3GW, and the newly installed capacity was 30.1GW, ranking first in the world for seven consecutive years. Experts predict that “photovoltaic + energy storage application” will start in the “14th Five-Year Plan”, enter a stage of rapid growth, and gradually become an important new format for photovoltaic applications.
Although the combination of “photovoltaic + energy storage” renewable energy and energy storage industry is an inevitable development trend, the development prospects of the optical storage industry are very broad, but because my country’s optical storage industry is still in its infancy, the current development still faces many urgent solutions. The demand for large-scale and commercial development of the energy storage industry is very urgent.
As a professional supplier of intelligent lithium batteries, energy storage products, energy storage system integrators, and digital energy service providers, Beijing Yunwai New Energy Technology Co., Ltd. serves smart grids, new energy power stations, communication base stations, etc., providing customers with digital energy service program. The company has long-term diversified layout of the energy storage business sector, and explored the market and business model of the coordinated configuration of photovoltaic and energy storage. Combined with the special geographical location and environmental factors of some customers, the company has opened up a new frontier in the solar energy storage market, providing a high proportion of renewable energy in the future. Suggestions and suggestions for energy development under the energy structure. At present, the energy storage project of Haituo Temple 50kW/100kWh energy storage project, led by Beijing Yunwai New Energy Technology Co., Ltd. and providing system integration and the cooperation of Zhangjiakou Power Supply Bureau, has been officially put into operation.
Haituo Temple is located in Chicheng County, Zhangjiakou City, Hebei Province. It is a site for Theravada Buddhist missionary and meditation. Because the original plan has not yet started, the current buildings are steel structure glass houses and greenhouse-type temporary buildings, and the thermal insulation capacity is insufficient, resulting in cold winters and hot summers, and excessive power consumption. At the same time, due to insufficient planning in the early stage, the transformer capacity may not be able to meet the use. The location of the project has a suitable climate in summer, and is cold in winter and uses electricity for heating, resulting in unbalanced electricity consumption and a long-term high load state in winter. At the same time, considering that the electricity price difference at the location of the project is 0.41 yuan/kWh, and it does not have the conditions for peak-shaving and valley-filling, photovoltaic + energy storage is used for self-consumption, and surplus electricity is used for energy storage, and is not connected to the Internet.
System principle topology
For the highest economic benefits of the system and considering the future system scalability, Yunwai New Energy adopts a 0.5C system design, with a total capacity of 100kWh, power of 50kW, and photovoltaics of 50kW. The system uses a 10-foot energy storage container. The system consists of lithium iron phosphate battery energy storage unit, photovoltaic energy storage integrated converter, battery management system, energy management system, temperature control system, fire protection system and pre-installed containers. The whole system is controlled and managed by the BMC battery management system and the BSC battery energy control system, which coordinates the work of LFP batteries, PCS and other components, realizes the energy absorption and release of the entire container energy storage system, and provides an overall solution for energy storage and release.