Research on Improving the Operation Stability of Wind Farms Connected to Power Grid by Using VSC-HVDC Containing SMES

Due to the volatility and intermittent nature of wind energy, the impact of wind power access on the stable operation of the power grid is particularly prominent. In this paper, this problem can be solved by using VSC-HVDC technology containing superconducting magnetic energy storage (SMES). SMES is connected in parallel on the DC bus of VSC-HVDC system. According to the mathematical model of VSC-HVDC system in d-q synchronous rotating coordinate system and PWM technology, the direct current control strategy of converter station and SMES is designed. In PSCAD/EMTDC, a simulation model of wind farm with asynchronous wind turbines connected to the grid via SMES and VSC-HVDC system is built. The simulation results show that the topology and control strategy proposed in this paper can not only effectively smooth the wind power fluctuation, but also improve the transient stability of the wind farm.