Research on Optimal Configuration of Energy Storage and Converter in DC Distribution System

In the distribution system, energy storage system can be used to stabilize load fluctuations, while there is a key problem of how to optimize the allocation of energy storage capacity and energy storage converter power. In this paper, the time-series Gaussian distribution model is used to describe the load with power fluctuations. When the load exceeds the sum of the power of the power supply and the energy storage, this part of the load will be short of power. This paper analyzes the risk of this kind of power outage and analyzes the system’s demand for energy storage and the lack of power supply caused by insufficient energy storage in a continuous period with an analytical method. Then, the optimal configuration model of energy storage capacity and converter power is established with the goal of maximizing the benefit of the DC distribution system, and a solution to the model using the gradient descent method is designed. Finally, several examples are optimized using this method, which shows that the method proposed in this paper can realize the optimal configuration of energy storage capacity, energy storage power and converter power.