Interaction between conventional and adaptive phasor power oscillation damping controllers

Adaptive phasor power oscillation damping controllers (APPODs) produce superior large signal performance with very little reliance on accurate system models. However, recursive phasor estimation, online frequency correction and adaptive phase-shift are involved which makes modeling such APPODs difficult in stability studies. Possible interaction with other controllers (e.g. lead-lag compensators) is thus unforeseeable restricting their acceptability in practice. In this paper potential interaction between an APPOD and a conventional POD (CPOD) is investigated. The study is primarily simulation based as mathematical analysis of such interaction is not straightforward due to highly complex non-linear nature of APPODs. Simulation results presented here show no adverse interaction which needs to be substantiated for large-scale systems.