Dynamic Stability of Isolated System in the Presence of PQ Disturbances

The aim of this paper is to assess the theoretical basis for the dynamic stability analysis in case power-quality disturbances, such as unbalances, harmonics, and interharmonics occur. This kind of pollution that is present in the currents and voltages of the system may cause stability problems especially in isolated electric plants where small generators, supply motor drives, static converters, or nonlinear loads are involved. Some examples based on simulation activity show the influence of these disturbances on the dynamic stability of the generator.