Research on Low-Voltage Ride-Through of Doubly Fed Induction Generators Based on MP-CC and the Crowbar Circuit

The Doubly fed induction generator (DFIG) occupies an important position in current wind turbines. With the continuous increase in wind power penetration, its Low-voltage ride-through (LVRT) capability becomes more important. When facing dynamic faults, traditional control strategies have the problems of slow response speed and insufficient control accuracy, which makes it difficult to meet the ride-through requirements. This article proposes a coordinated control strategy for LVRT of the DFIG based on Model predictive current control (MP-CC) combined with a crowbar circuit. This method first establishes a mathematical model of the doubly fed wind turbine and then uses the rolling optimization and constraint-handling capabilities of model predictive control to achieve rapid dynamic adjustment of the rotor current and grid-side power. The simulation results show that the optimized model predictive control strategy can more effectively control the rotor over current and make the system have better stability, which can effectively improve the LVRT capability of the system and is of great significance to the current rapidly developing wind power generation technology.