The world's first outdoor empirical experimental platform for photovoltaic and energy storage released its 2023 annual data results.

A reporter from China Energy News reported on the National Photovoltaic and Energy Storage Demonstration Experimental Platform (Daqing Base) on March 28 (hereinafter referred to as the "Platform") It was learned at the 2023 annual data results conference that as the world's first outdoor empirical experimental platform for photovoltaic and energy storage, since it was officially approved by the National Energy Administration at the end of 2020, the platform has been uniformly planned and implemented in stages. Based on the five-year completion goal, the first and second phases of construction have been completed, the third phase of construction and the fourth phase of plan design are being carried out, and the preliminary preparations are being implemented for the fifth phase.

According to Yao Xiaoyan, Secretary of the Party Committee and Chairman of State Power Investment Corporation Yellow River Upstream Hydropower Development Co., Ltd., which is responsible for platform construction and management, the platform has completed data collection and analysis for two complete years in 2022 and 2023, from meteorology, components, inverters, brackets, energy storage, systems and other dimensions have accumulated a large number of objective, comprehensive, scientific and accurate empirical data and conclusions, and shared empirical experimental results with the whole industry, comprehensively demonstrating the scientific nature of the platform. Systematicality, fairness and authority have played an important role in industrial development, technological progress and transformation of achievements.

"The 2023 data results closely focus on hot issues and urgent needs that are of widespread concern to the industry. They compare the performance differences of various types of equipment in different environments year by year, and verify the differences in various technical indicators between components made in China and imported similar equipment. The relationship between climate resources such as solar energy and temperature and actual power generation capacity was studied in depth, and factors influencing regional characteristics such as back irradiation and temperature coefficient were quantified." Yao Xiaoyan said that after two years of empirical analysis, the platform has accumulated a large amount of valuable data resources, carried out three types of empirical studies oriented to industry, region, and power grid, and proposed an optimal design with the highest efficiency and lowest cost for outdoor operation systems. plan.

Regarding meteorology, components, inverters, brackets, photovoltaic systems, energy storage products, and optical storage systems, Xie Xiaoping, director of the platform academic committee, respectively introduced the empirical results under typical climate scenarios of typical high latitudes and warm and cold zones.

In terms of components, from the perspective of power generation characteristics, N-type high-efficiency components have better power generation. TOPCon components will have the highest power generation in 2023, 1.16% and 2.87% higher than IBC and PERC respectively, which is basically consistent with the empirical results in 2022; The maximum deviation in power generation of components from different manufacturers with the same technology reaches 1.59%. From the perspective of attenuation rate, the attenuation rate of N-type components is low, with TOPCon attenuation ranging from 1.57% to 2.51%, IBC attenuation ranging from 0.89% to 1.35%, PERC attenuation ranging from 1.54% to 4.01%, and HJT component attenuation reaching 8.82%.

In terms of inverters, string inverters will have the highest power generation capacity in 2023, 1.04% and 2.33% higher than centralized and distributed inverters respectively, which is consistent with the empirical results of inverters with different technical routes in 2022.

In terms of brackets, there are large differences in power generation between different types of brackets, with dual-shaft brackets being the best for power generation. For the whole year of 2023, dual-shaft, vertical single axis, oblique single axis, flat single axis (with a 10° inclination angle), and full-dimensional brackets will be 26.52%, 19.37%, 19.36%, 15.77%, and 12.26%. In addition, flexible stents should focus on stent structure and reliability.

In terms of energy storage products, since energy storage batteries from different technical routes and different manufacturers were officially put into operation in August 2023, after one and a half years of operation, the charge and discharge capacity and charge and discharge efficiency have declined to varying degrees. In addition, the energy storage system is greatly affected by temperature. When the ambient temperature is 5 ° C-20 ° C, the system efficiency is the highest, reaching 82.66%.

"After two years of empirical analysis, the platform has unearthed some issues that industries should focus on." Xie Xiaoping introduced that six suggestions were formed based on the 2023 annual data results, including improving the accuracy of optical power prediction, optimizing the number of components in the string, promoting the application of inclined flat single shafts in high latitudes and cold temperate zones, improving sealing materials and processes for flow battery products, optimizing power generation calculation parameters of double-sided component systems, and improving the design and operation strategies of optical storage power stations.

Regarding the current achievements of the platform, Yao Xiaoyan said that since the establishment of the platform, it has released 7 empirical experimental data results in alpine and high latitude regions, and undertaken 8 cutting-edge research projects. The first sets of many new technologies and new products have been widely used on the platform. It provides strong data support and technical guidance for the high-quality development of the photovoltaic and energy storage industries and the construction of new power systems.