Power mileage-based allocation and dispatch strategy of battery energy storage system

The unsteady nature of renewable energy leads to voltage and power profile fluctuations over short periods of time and according to seasonal variations. Battery energy storage systems (BESS) offer promise to mitigate such disadvantages. However, to apply BESSs to practical power grids, we require a means to allocate them, including their number, location, and capacity, and a control strategy to allocate power demand. In this paper, we first define a linear performance index, called power mileage, which denotes the voltage quality. We then build a new model using power mileage to optimize the allocation of BESSs and construct a simple control method to alleviate the voltage fluctuation. The use of a power dispatch matrix obtained from the optimization model yields a simple but effective method for controlling the batteries. Applying our model to a real-world power grid in Chongqing, China shows that the method works well at peak-shaving on a large scale and mitigates fluctuation over short time periods.