Patent ID: 7973427

Claim:
A converter control unit for controlling a converter based on power electronic semiconductor components and arranged in a generator excitation system of an electric power system, the unit comprising: synchronization means providing time-stamps for global time synchronization; a phasor data facility for calculating, based on signals from an instrument transformer representing a generator current I G , or generator voltage V G of the power system, time-stamped synchronized phasor data; a power system stabilizer for controlling, in view of stabilizing the power system against power oscillations and based on the generator voltage V G and/or the generator current I G of the generator, an excitation converter of the generator excitation system, and means for sampling, at a first sampling rate above a network frequency of the power system, a generator signal indicative of the generator voltage V G and/or the generator current I G , thus producing a sampled generator signal, wherein the phasor data facility comprises means for down-sampling the sampled generator signal.