Low Voltage Ride Through Equivalence of Centralized Doubly-Fed Wind Farm Based on Particle Swarm Optimization

These days the wind power in the power system is increasing. It is very important to build a reasonable wind farm grid-connected model to study the dynamic characteristics of the power system. Due to the small capacity of wind turbines and many single units, the detailed modeling will have problems such as high model order and long simulation time. Therefore, it is necessary to carry out equivalent modeling of wind farms. At present, the research on the equivalence of wind turbines mainly focuses on the equivalence of wind turbine electrical modules. They cannot fit the low voltage ride-through characteristics of wind turbines well. Therefore, this paper proposes an equivalent method for LVRT characteristics of wind farms based on PSO. The simulation results in PSASP show that the equivalent method can reduce the model order and improve the simulation calculation speed by performing dynamic equivalence of wind turbines. And these winds have the same structure and control method but different LVRT control parameters.