Enhancing Low Voltage Ride Through Capability of DFIG-based Wind Turbine Generators with a RSFCL and RSC Control

摘要

In consideration of the Low Voltage Ride Through (LVRT) requirement proposed in grid codes, a LVRT scheme for Doubly Fed Induction Generator (DFIG) based Wind Turbine Generators (WTGs) using a Resistive-type Superconducting Fault Current Limiter (R-SFCL) and two modified control strategy: Reactive Power Control (RPC) and Inductance-Emulating Control (IEC) is proposed in this paper. The installed position, equivalent modelling of R-SFCL and technical principle for improving LVRT capability are described. In addition, the basic principles of RPC and IEC both of which are activated under grid faults are investigated. Finally, the simulations and the performance evaluation are also conducted compared with the single IEC scheme and single RPC-IEC scheme, which demonstrates the effectiveness and superiority of the proposed scheme on enhancing LVRT capability.