Subsynchronous Resonance Mitigation for Series Compensation Transmission System of DFIG Based on PR Control

Series compensation capacitance can effectively improve transmission capacity. However, series capacitor may cause subsynchronous resonance (SSR). This paper analyzes the mathematical model of series compensation transmission system of doubly fed induction generator (DFIG) and frequency adaptation characteristic of PR controller. Then, rotor side PR control is proposed to mitigate stator subsynchronous current, grid side PR control is introduced to mitigate subsynchronous oscillation of DC-link voltage and reactive power. Then, a simulation model is built in Matlab/Simulink. The results verify the SSR mitigation strategy has good dynamic performance. Hardware experiment will be done on RT-LAB simulation system in the future.