Consolidate the foundation of the new power system and promote the high-quality development of photovoltaic "14th Five-Year Plan"

Second, the intelligent level of the distribution network is not high, and the construction speed cannot meet the needs of the rapid development of distributed photovoltaic power generation. The improvement of the degree of intelligence can effectively improve the space for accepting photovoltaic power generation in the distribution network, and is conducive to improving the utilization rate of distributed and household photovoltaic. The distribution network construction period is long, and the distributed photovoltaic power generation project construction period is short. If the upgrading and technology upgrading of the distribution network is not carried out in advance, it may lead to the delay of the grid connection of distributed photovoltaic power generation projects, and reduce the economy of distributed photovoltaic projects.

Third, the current power system mechanism can not fully utilize and mobilize the power system flexibility resources. Objectively speaking, the existing flexible resources of China's power system are not much, so it is necessary to reform thermal power units to increase the supply of flexible resources. At present, China's auxiliary service market is not perfect, there is no compensation mechanism for the transformation of flexible units, neither can use the existing flexible power supply, nor can effectively mobilize the enthusiasm of thermal power enterprises to carry out flexible transformation of thermal power units, limiting the improvement of consumption space.

Fourth, the power system mechanism that supports photovoltaic power generation to become the main power source still needs to be improved. There is no clear statement on how photovoltaic power generation will assume the responsibility for the safe and stable operation of the power system in the future, and it is urgent to clarify the relevant requirements for photovoltaic power generation from the perspective of top-level design. At present, the photovoltaic power generation is equipped with a certain capacity of energy storage is not the best solution for the development of photovoltaic power generation, and the future through the auxiliary service market to solve the problem of safe and stable operation of the power grid is more efficient and less costly.

Fifth, the lack of flexibility of the power system has led to the Northwest region becoming the main region to abandon light. Gansu and Qinghai, with relatively good solar resource conditions, were the first to begin large-scale development of centralized photovoltaic power stations. In 2015, the installed capacity of photovoltaic power generation in the two provinces was 610 million kilowatts and 5.64 million kilowatts, respectively, ranking first and second in the country, as shown in Figure 5 below. In a short period of time, the installed capacity of photovoltaic power generation was greatly increased, but the local flexible power supply construction could not keep up, and Gansu and Qinghai ushered in a large area of photovoltaic power rationing, especially the most serious power rationing in Gansu. In order to inhibit the further occurrence of light abandonment phenomenon of photovoltaic power generation, the National Energy Board has taken a series of measures to guide the development of photovoltaic to the area of absorption space, and the photovoltaic increment in the 13th Five-Year Plan is mainly concentrated in the central and eastern regions, see Figure 6. From 2017 to 2019, the average light abandonment rate of photovoltaic power generation in China was 6%, 3% and 2%, respectively, and the utilization rate of photovoltaic power generation was improved.