Three-phase short circuit calculation method based on pre-computed surface for doubly fed induction generator

3rd International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Ma, J.^1 ; Liu, Q.^1

State Grid Anhui Electric Power Company Economic and Technological Research Institute, Hefei

230022, China^1

关键词: Control and protection;    Distribution systems;    Doubly fed induction generator (DFIG);    Doubly fed induction generators;    Engineering practices;    Low voltage ride through (LVRT);    Short circuit calculations;    Three-phase short circuits;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/113/1/012137/pdf
DOI  :  10.1088/1755-1315/113/1/012137

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper presents an improved short circuit calculation method, based on pre-computed surface to determine the short circuit current of a distribution system with multiple doubly fed induction generators (DFIGs). The short circuit current, injected into power grid by DFIG, is determined by low voltage ride through (LVRT) control and protection under grid fault. However, the existing methods are difficult to calculate the short circuit current of DFIG in engineering practice due to its complexity. A short circuit calculation method, based on pre-computed surface, was proposed by developing the surface of short circuit current changing with the calculating impedance and the open circuit voltage. And the short circuit currents were derived by taking into account the rotor excitation and crowbar activation time. Finally, the pre-computed surfaces of short circuit current at different time were established, and the procedure of DFIG short circuit calculation considering its LVRT was designed. The correctness of proposed method was verified by simulation.