| Title |
Gain Design Method of a DC-Link Voltage PR Controller for Damping Sub-Synchronous Oscillations in Type-3 DFIG Wind Turbines |
| Authors |
김우영(Woo-Young Kim) ; 조형준(Hyeong-Jun Jo) ; 김민철(Min-Chol Kim) ; 최연빈(Yeon-Bin Choi) ; 김수배(Soo-Bae Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.8.1703 |
| Keywords |
Sub-synchronous Oscillation(SSO); Double-fed Induction Generator(DFIG); Fixed Series Compensation; MATLAB/Simulink; PSCAD |
| Abstract |
This paper proposes a proportional?resonant (PR) DC-Link voltage controller and an analytical gain design method to enhance the sub-synchronous oscillation (SSO) damping capability of conventional PI-based DC-link voltage controllers. The proposed approach derives the closed-loop characteristic equation based on the DC-link voltage dynamic model. Target closed-loop poles are then specified according to the desired damping ratio and the observed SSO frequency, from which the PR controller gains KP and KR are analytically calculated. The PR controller gains are computed using MATLAB/Simulink, and the SSO damping performance of the proposed PR controller is evaluated through PSCAD simulations in comparison with a conventional PI voltage controller. Simulation results demonstrate that the proposed PR controller more effectively damps DC-link voltage oscillations and provides improved dynamic performance, including reduced overshoot and faster settling time, compared to the PI controller. |