NSGA-II Based Cooperative Optimization Strategy for Energy Storage Capacity Configuration and Operation Dispatch of Microgrid

Energy storage is an important equipment for peak clipping and valley filling in microgrid, and its capacity configuration accounts for a large proportion in the construction investment of microgrid. On the other hand, rational operation dispatch of microgrid is an important means to improve operation economy. For a long time, due to different factors such as construction time and responsibility subjects, energy storage capacity configuration in microgrid construction stage and operation dispatch in microgrid operation stage are often considered separately. In order to further improve the integral construction and operation economy of microgrid, this paper uses the second generation nondominated sorting genetic algorithm (NSGA-II) to carry out research on cooperative optimization strategy for energy storage capacity configuration and operation dispatch of wind-solar-storage grid-connected microgrid. Firstly, the energy storage capacity was determined by using NSGA-II, aiming at the economic benefits of microgrid and the peak-to-valley power difference of the connecting line between microgrid and grid. Then, the multi-time scale optimization method combining day-ahead and intra-day operation dispatch is adopted to develop the optimization strategy for operation dispatch of microgrid to improve economic benefits. The calculation results show that rational configuration of energy storage can effectively reduce the impact of wind power fluctuations and photovoltaic power fluctuations on grid, and the operation dispatch optimization scheme developed makes the economic benefits increased by 58.5% compared with the traditional power smoothing control strategy.