Multi-objective Optimization Scheduling Method of Combined Pumped Storage and VSC-HVDC Grid to Improve Transmission Capacity of Renewable Energy in Multi-region

In order to improve the transmission capacity of renewable energy in multi-region, the operation optimization method of the pumped storage power station and VSC-HVDC power grid is studied. The multi-objective optimal operation model for 96 periods of the day is built to maximize both the delivering power of renewable energy and transmission section, considering the transient power angle stability and safety constraints of the joint transmission system of renewable energy-pumped storage-thermal power units-VSC-HVDC, as well as the operation characteristic of all generation units in the combined power system including the startup and shutdown restrictions. A case study system is designed based on an actual power grid in north China. The results show that the joint adjustment of pumped storage and VSC-HVDC grid operation can effectively reduce the curtailment of renewable energy, improve the level of renewable energy consumption and increase the power transmission capacity of the transmission section.