New Trends and New Models of New Energy + Energy Storage

 

"New energy + energy storage" can effectively cope with fluctuations in wind and solar power output, improve the utilization rate of new energy, and enhance the safety performance of grid connection. It is conducive to ensuring the safe and stable operation of electricity and promoting the high-quality development of new energy. It is an important support for building a new power system. According to statistics from the Zhongguancun Energy Storage Alliance, in the first half of 2023, the proportion of new energy storage projects in the country applied to the power supply side was about 42%, of which new energy storage accounted for as high as 98%, which is still an important application field of energy storage. However, both the energy storage technology itself and the new energy storage mode are still in the development process. With the development of technology and the advancement of practice, the understanding of the coordinated development of new energy and energy storage is constantly deepening. New energy storage also focuses on the development trend of new power systems and accelerates the adjustment of actual problems in energy storage utilization, and some new changes and attempts have emerged.

 

 

 

In recent years, new energy power generation has continued to develop rapidly, showing the distinctive characteristics of both centralized and distributed systems. As of the end of June 2023, the country's installed photovoltaic power generation capacity reached 470 million kilowatts, of which distributed photovoltaics accounted for 198 million kilowatts, accounting for more than 40%. In terms of regions, distributed photovoltaics in the eastern region are developing rapidly, and the installed capacity has surpassed centralized photovoltaics. Among them, distributed photovoltaics accounted for nearly 78% in Zhejiang, more than 72% in Shandong, and more than 67% in Jiangsu.

 

The large-scale development of distributed photovoltaics will have a certain impact on the safe and reliable power supply for users and the stable operation of the distribution network. It has stimulated the enthusiasm to promote the on-site consumption and utilization of new energy through the configuration of energy storage and promote the gradual expansion of distribution and storage demand from centralized new energy. to distribute new energy. At present, some regions such as Jiangsu, Zhejiang, Shandong, and Ningxia have put forward clear requirements for distributed photovoltaic energy storage. Most of the distribution and storage ratios require 8% to 15% of the new energy installed capacity.

 

 

With the large-scale development and construction of distributed photovoltaics in industrial parks, building rooftops, charging stations, etc. as the main application scenarios, the trend of "high proportion of photovoltaic installed capacity, surplus power during the noon peak, and tight power consumption during the evening peak" has become increasingly obvious. Under the incentive of peak and valley electricity prices, the configuration of energy storage can not only improve the utilization rate of photovoltaic power generation and reduce the energy cost of enterprises but also obtain a certain amount of electricity sales income through the "surplus electricity grid". In this context, the demand for distributed new energy distribution and storage on the user side will further expand, and the "new energy + energy storage" model will gradually extend from the power supply side to the user side.

 

 

At present, the dominant position of independent energy storage has been clarified, and various regions have gradually promoted independent energy storage to participate in electricity spot and ancillary service market transactions. Compared with independent energy storage, new energy storage with energy storage cannot participate in the electricity market independently, and its enthusiasm and initiative are insufficient. Taking Shandong as an example, from January to June 2023, independent energy storage can achieve one charge and one discharge per day, with the utilization of 533 hours, while the utilization of energy storage with energy storage is only 192 hours, about 1/3 of independent energy storage.

 

The difference in utilization efficiency and revenue between independent energy storage and energy storage with energy storage in actual operation has received widespread attention. Shandong, Sichuan, Henan, Jiangsu, and other regions have issued policies to clarify that new energy storage projects in the form of supporting construction can choose to be converted into independent energy storage projects when they meet the same technical conditions and safety standards through technical transformation. Among them, Shandong has promoted the transformation of new energy storage with energy storage to independent energy storage at a faster pace, has carried out pilot work, and has put forward clear requirements for relevant technical conditions, safety plans, application review, and follow-up acceptance.

 

The conversion of energy storage built with new energy into independent energy storage can effectively activate the existing storage resources, promote their better participation in the power market and dispatching, and achieve the optimal allocation and shared utilization of idle resources on a larger scale. By the end of 2022, the cumulative scale of energy storage built with new energy nationwide has reached 2.82 million kilowatts/5.5 million kilowatt-hours, with a large number of potential resources that can be converted into independent energy storage.

 

 

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