Low Frequency Oscillation Suppression Strategy for AC Power Grid with UHVDC

Abstract

Aiming at the phenomenon of low frequency oscillation caused by ultra high voltage direct current operation, this paper intends to adopt the method of parameter optimization of power system stabilizer to improve the small interference stability of the system. In order to ensure the rapidity and accuracy of small interference calculation, this paper first establishes a small interference linearization model for high voltage direct current system based on voltage source converter, and then proposes a coordinated optimization method for supplementary damping controller and power system stabilizer of DC voltage source converter under multiple operation modes. The method can improve the small interference stability of AC power grid with ultra high voltage direct curren in an all-round way. Finally, the method is validated by simulation software. The simulation results show that the proposed method can effectively improve the small interference stability of the system.