Damping of interarea oscillations using electronic power transformer

SUMMARY This study utilizes the electronic power transformer (EPT) to enhance the damping of interarea oscillations in a multimachine power system based on active power modulation. The dynamic model of EPT is established, and decoupled vector control schemes of inner current control loops and outer active and reactive power control loops are modeled and designed. A power oscillation damper (POD) applied to the active power control loop of EPT is introduced to improve the stability of the power system. The POD controller parameters are designed based on the frequency response method. A study system based on the classical two-area four-machine system is built for damping controller design and time domain simulation, and the design procedures are presented in detail. The effectiveness of the designed POD controller is verified through eigenvalue analysis and time domain simulations. Copyright © 2014 John Wiley & Sons, Ltd.