Grid-forming BESS has gained a lot of attention because of its control response characteristics being similar to conventional generators, and is regarded as the key equipment to support the construction of new type of power system. Most research on this technology is currently focused on micro grid application scenarios, and there is no system level research on large grid application. Given this, a modeling method of grid-forming BESS is proposed based on the principle of grid-forming technology. Then the mechanism of grid-forming BESS participating in power sharing is deduced based on the essential properties of voltage source, and the capacity for its proportion in the power grid is discussed. Finally, taking a domestic project as an example, a grid-forming BESS model is built and then simulation analysis is made for a large power grid application scenario. The results show that the modeling and analysis methods proposed in this paper can guide the system level engineering application of grid-forming BESS.

This work is supported by the National Key Research and Development Program of China (No. 2021YFB2400805).