Modeling, analysis and parameters design of rotor current control in DFIG-based wind turbines for dynamic performance optimizing

摘要

As doubly fed induction generator (DFIG) based wind turbines (WTs) have already become a kind of significant generators in modern power systems, a reliable parameters design method for an excellent dynamic performance in rotor current control is a basic requirement for outer control loops design and system analysis. Due to the amplitude characteristic is neglected in conventional frequency domain design method, rotor side converter (RSC) is designed as a voltage-source converter (VSC) with 0.707 damping ratio in many studies and projects. However, closed-loop rotor current control system is peculiar and complicated for its multi-input multi-output (MIMO) and high-order properties. In this paper, based on proposed mathematical model, dynamic performance of rotor current control system is analyzed systematically through obtained analytical expressions in time domain. Finally, in order to achieve an optimized performance on reference tracking and disturbance rejection, parameters design procedures are proposed and verified with a 10-kW DFIG prototype.