Research on Low-Carbon Operation of Substation Power Supply System Based on Microgrids

In order to solve the problem of carbon emissions in substations, a substation-microgrids system with microgrids as the source side and substations as the load side is proposed. Firstly, a mathematical model of the proposed substation-microgrids system is established, with wind and photovoltaic power generation in the microgrids as the main power supply of the system. Then, the electric energy storage in traditional uninterruptible power supply (UPS) system is replaced by a hydrogen energy storage system, and electric vehicles (EV) is introduced for orderly charging. Finally, in order to verify the effectiveness of the proposed substation-microgrids system, a multi scenario comparative analysis is conducted based on the Cplex solver. The simulation results show that the proposed model not only effectively reduces carbon emissions, but also achieves energy cascade utilization and reduces the system's wind power and photovoltaic power curtailment rate.