Cooperative Control of SFCL and Reactive Power for Improving the Transient Voltage Stability of Grid-Connected Wind Farm With DFIGs

摘要

This paper studies transient voltage stability in a 9-MW doubly-fed-induction-generator-based wind farm integrated with one superconducting fault current limiter (SFCL)-based passive voltage compensator and one transient voltage control (TVC)-based active voltage compensator. To achieve effective control manner, basic cooperative operation and modeling of the two voltage compensators are described. In addition, a technical discussion on the designs of proportional–integral parameters of the TVC and SFCL resistance are conducted. The effectively integrated system is highlighted with a self-acting voltage compensation feature from the passive SFCL and an intelligent reactive power compensation feature from the active TVC. Simulation results show that the cooperative control of the SFCL and TVC can achieve high stator voltage level and high output reactive power for efficient grid connection and voltage support.