Topology and Configuration Optimization of Wind-Solar-Hydrogen Combined System

Hydrogen energy storages play crucial roles in enhancing the consumption of renewable energy, reducing energy loss, and improving the comprehensive energy utilization rates. The installation of a wind-solar-hydrogen combined system, which includes wind turbines (WTs), photovoltaics (PV), and hydrogen energy storage, can effectively promote the application of renewable energy resources. The overall investment and operation cost are the primary factors that affect the promotion of the wind-solar-hydrogen combined system. This paper proposes a joint topology and configuration optimization method to address these challenges and minimize the overall cost. The topology optimization mainly focuses on the connection design between the medium voltage direct current (MVDC), medium voltage alternating current (MVAC), low voltage direct current (LVDC), and low voltage alternating cur-rent (LVAC) buses. The configuration optimization aims to optimize the installed capacity of WTs, PVs, and hydrogen energy storages in each bus. Case studies based on a certain renewable energy penetrated microgrid are carried out to validate the effectiveness of our method. Simulation results show that our methods can achieve the lowest overall cost.