On May 23, the Development and Reform Commission of Kailu County, Tongliao City, Inner Mongolia Autonomous Region, and the State Grid Kailu County Power Supply Company issued the ''Announcement on Suspending the Filing of Household Distributed Photovoltaic Power Generation Projects', and suspended the filing of household distributed photovoltaic power generation projects. This is another case of the tightening of distributed grid-connected policies in many places in China.

With the massive growth of distributed PV installations, there are some areas that are difficult to accommodate. In June 2023, the National Energy Administration issued a notice to evaluate the carrying capacity of distributed photovoltaic access to the grid in six provinces of Shandong, Heilongjiang, Henan, Zhejiang, Guangdong and Fujian. Half a year later, the evaluation reports of six provinces were released one after another: except Zhejiang, the other five provinces have a large number of problems of insufficient regional power grid capacity. According to incomplete statistics, more than 150 counties and cities have a distributed photovoltaic network capacity of 0, which is the so-called "red zone".

However, in the face of the energy transition and carbon peak carbon neutral demand, the share of renewable energy, including distributed photovoltaics, in the energy system will continue to increase in the future. In February of this year, the National Development and Reform Commission and the National Energy Administration issued the "Guiding Opinions on the High-quality Development of Distribution Networks under the New Situation" clearly stated that by 2025, it will have a distributed new energy access capacity of about 0.5 billion kilowatts. How to properly do a good job of distributed photovoltaic consumption is a problem that must be solved.

On June 13, 2023, the State Energy Administration issued the Notice on Printing and Distributing the Pilot Work of Evaluating the Carrying Capacity and Improvement Measures of Distributed Photovoltaic Access to Power Grid, proposing to focus on solving the problems of limited distributed photovoltaic access to power grid, actively evaluate the adoption of new distribution network, new energy storage, load side response, virtual power plant and other measures to build intelligent distribution network, and improve the carrying capacity of distributed photovoltaic access to power grid.

Distributed photovoltaic storage has become a measure to solve the problem of multi-place elimination. According to incomplete statistics, up to now, 9 provinces and 20 places have issued distributed photovoltaic storage policies, mainly concentrated in Shandong, Jiangsu, Zhejiang, Hebei and other areas with better development of distributed photovoltaic resources and markets. When the voltage exceeds the limit, the energy storage device is started to charge, which can promote the consumption of photovoltaic power generation. When the electricity load increases, the energy storage can be released to support the demand for electricity. In order to improve the enthusiasm of the owners, some local governments have provided subsidy policy support at the same time. For example, Shaoxing in Zhejiang, Zhuji in Zhejiang and Wujiang District in Suzhou in Jiangsu have successively introduced relevant policies to subsidize distributed photovoltaic energy storage, which are mainly divided into two types. One is to give a one-time subsidy according to the installation standard of 100~200 yuan/kilowatt, requiring annual utilization hours to be not less than 600 hours, and the subsidy amount declines year by year. The other is to give 0.3~0.9 yuan/kWh subsidy according to energy storage and discharge, the duration of the subsidy often lasts for 2 to 5 years.

In addition, recently in the promotion of centralized convergence and other models, the realization of the station area and line capacity, but also some areas of the power market policy began to clear, centralized convergence after the photovoltaic system can be equipped with storage, controllable, adjustable and participate in the market. The centralized convergence mode is to concentrate the distributed photovoltaic projects in an area to one or several dedicated step-up transformers, which are connected to the grid through 10 kV lines. Centralized convergence can solve the problem of insufficient transformer capacity in the station area, and the distribution and storage of the station area can solve the problem of excess power and insufficient consumption of the line, and the two can be coordinated.

Of course, these alone can not solve all the problems of distributed photovoltaic consumption, but also need to adapt to local conditions, comprehensive measures.

In the early stage of project development, do a good job of distributed photovoltaic development and grid-connected capacity. The evaluation of the carrying capacity and improvement measures of distributed photovoltaic access to the power grid started last year provides a reference for the overall development and grid-connected capacity. In order to promote the whole county roof photovoltaic development, start the implementation of light action, while further strengthening the standardized development and quality supervision of distributed photovoltaic.

In the power grid, do a good job of distribution network transformation, improve the distribution network carrying capacity and flexibility, distribution network digital, intelligent transformation of the comprehensive promotion, to achieve active distribution network and large power grid inclusive. Effectively promote the integrated development of distributed smart grid and large power grid, better meet the development needs of distributed power supply, new energy storage and various new formats, provide strong support for the establishment of a high-quality charging infrastructure system with wide coverage, moderate scale, reasonable structure and perfect functions, and promote the realization of non fossil energy consumption target with high level of electrification. According to the State Grid Jiangsu Electric Power Co., Ltd., on May 22, China's first distributed photovoltaic resource development and allocation platform was built in Jiangsu. Platform innovation combined with artificial intelligence, industrial Internet and other advanced technologies, for the first time in China to achieve Jiangsu's entire 100000 square kilometers of roof distributed photovoltaic resources within the large-scale precise positioning, evaluation and optimal allocation, will effectively serve the development of distributed photovoltaic industry chain, and comprehensively improve the efficiency of distributed photovoltaic installation and use. In order to promote the consumption of distributed photovoltaics, power grid companies are exploring practices.

In the electricity market, one is to promote distributed photovoltaics to participate in electricity market transactions. Recently, new progress has been made in distributed photovoltaic green power trading. Guangdong and Jiangsu provinces successfully reached the first green power transaction, Zhejiang Province also issued a green power transaction rules to solicit opinions notice, clear distributed photovoltaic can participate in the green power transaction through the form of aggregation. The National Energy and New Energy Department mentioned in the relevant meeting that large provinces with distributed photovoltaic installations should give priority to entering the green power market. The second is to strengthen demand-side management. Photovoltaic does not contribute in the morning and evening, and noon is the peak period of output. The load can be adjusted through the price mechanism. For example, the electricity price at noon is lower than that at morning and evening, guiding users to change their electricity consumption habits, so that the load at morning and evening is reduced and the load at noon is increased, which is helpful to solve the problem of distributed photovoltaic consumption. According to the financial reports of major enterprises, at present, JinkoSolar, Longji Green Energy, Trina Solar, Jingao Technology, Artes and other head enterprises have built factories in the United States.