Online small signal stability analysis of multi-machine systems based on synchronized phasor measurements

This paper presents a novel approach for small signal stability assessment of a multi-machine system using only synchronized Phasor Measurement Units (PMUs) data. The proposed method does not need any information about the generators, network configuration or line impedances. By installing one PMU on each generator bus and using classical model for generator, all of the network and generators parameters needed for small signal stability analysis are estimated using the ambient data registered in the PMUs. Least square error estimation is used to obtain a reduced admittance matrix for the network in real-time. The estimated model is then used to evaluate the multi machine system dynamics in real-time. Simulation results show that the proposed method is applicable in practical systems and may be used to help the system operator to monitor small signal stability of the system.

≶ A novel method for small signal stability assessment of power system is presented. ≶ The method uses only PMU data. ≶ All of the network and generators parameters estimated using PMU data. ≶ The proposed method is applicable in practical systems. ≶ The method can help system operator to monitor small signal stability of the system.