Cooperative Control of Wind-Hydrogen-SMES Hybrid Systems for Fault-Ride-Through Improvement and Power Smoothing

Abstract

Green hydrogen produced from wind power has a significant potential value for the fossil-free green energy transition. However, a grid-connected wind-hydrogen hybrid system is sensitive to grid fault and wind variation disturbances which probably cause the disconnection of wind turbine (WT) system thereby deteriorating the safe operation of power grid. To solve this problem, this paper firstly presents a feasible setup of wind-hydrogen-superconducting magnet energy storage (SMES) hybrid system. Then a cooperative control strategy is proposed to protect the grid-connection of this system from the disturbances for the system reliability and power quality. In this method, the flexibility of alkaline electrolyzer and SMES on providing fault-ride through (FRT) and power-smoothing are exploited. Moreover, based on two cooperative mechanisms with the coordination of SMES and electrolyzer, this method offers a cost-effective FRT solution with a capital cost reduction of SMES, and an effective power smoothing approach for the fluctuated wind power. Based on case studies the feasibility and superiority of the presented control method are demonstrated.