DECOMPOSITION AND MITIGATION OF A DISTURBANCE BEING PRESENT AT AN ELECTRIC CONNECTION BETWEEN AN ELECTRIC POWER GENERATING SYSTEM AND A POWER GRID

摘要

It is described a method for decomposing a disturbance on an electric signal being present at an electric connection (170) between an electric power generating system (110, 600) and a power grid (150) into a first disturbance (II (n) ) with a first strength, wherein the first disturbance is assigned to the electric power generating system (110, 600), and a second disturbance (12 (n) ) with a second strength, wherein the second disturbance is assigned to the power grid (150). The described method comprises (a) determining a voltage value (Um (n) ) of a voltage of the electric signal, (b) determining a current value (Im(n)) of a current of the electric signal (c) calculating a value of an open circuit voltage (Upwm(n)) of an equivalent voltage source (212) characterizing the electric power generating system (110, 600) in a harmonic model of the electric power generating system (110, 600) based on the measured voltage value, on the measured current value and on a characteristic equivalent impedance (Zchm(n))) of the electric power generating system (110, 600), and (d) determining the strength of the first disturbance (II (n) ) based on the calculated value of the open circuit voltage (Upwm(n)) of the equivalent voltage source (212).