Analysis of Energy Storage Capacity Value Considering Low-carbon Policies

Under the background of realizing the goal of "double carbon", vigorously developing new energy represented by wind and solar and building a new power system that adapts to the large-scale development of new energy have become the inevitable path of China's energy transformation. However, in the peak period of power load, new energy has lower active power, it is difficult to provide reliable support for the system. Energy storage has the ability of two-way fast and flexible adjustment, and can provide power, capacity and security support services for the system. However, energy storage is a resource with limited capacity, so it is becoming more and more important to accurately evaluate the contribution of energy storage to system adequacy. Therefore, this paper outlined the assessment framework of energy storage capacity value, and based on the concept of equal reliable capacity ratio, a capacity credit definition considering marginal value was proposed to characterize the capacity value of energy storage, and a specific calculation method for capacity credit of energy storage was given. The power planning model considering the carbon trading market and the renewable energy quota system was established for market simulation, and the impact of the introduction of different low-carbon policies on the capacity credit of energy storage was analyzed. The calculation example shows that the capacity credit of energy storage is affected by the carbon trading market and the renewable energy quota system to varying degrees.