1 INVESTIGATION OF LOAD CONTRIBUTION IN DAMPING OF A MULTI-MACHINE POWER SYSTEM BASED ON SENSITIVITY ANALYSIS

Proper The electric load has a great influence in low frequency oscillations of a power system and load modelling is important in the low frequency oscillation studies. This paper aims at quantifying the load contribution in damping of a multi-machine system on the basis of sensitivity analysis. In the proposed method, firstly the resonant frequencies of the power system are identified using cross-correlation (autocorrelation) and after that load transfer functions are identified. Then the right modal matrix can be determined by evaluating the load transfer function at the power system resonant frequency. Finally the sensitivity of load parameters with respect to the load is determined by using identified load parameters, right and left modal matrices. A test power system including three generators and 9 buses is utilized to simulate and validate the algorithm