Coordinated Tuning of Controller Parameters in AC/DC Grids for Power Oscillation Damping

Oscillatory modes in power systems will become more variable due to the increasing share of volatile renewable generation. Adding new or replacing existing controllers in power systems in order to damp such oscillations is an expensive and difficult task. Thus, new functions are required in order to optimally use existing controllers for the damping of variable oscillations. This paper presents a method for automatic parameter tuning of existing controllers in AC/DC power systems for optimal oscillation damping. For this purpose, we first present a detailed dynamic model of AC/DC grids with explicit dependencies on controller parameters. We then use H-infinity optimization to tune the controllers in the system. The efficiency of the proposed method is demonstrated with detailed rounded-mean-square simulations of a modified IEEE 39 bus power system.