Oscillatory interaction between synchronous generator and local voltage-dependent load

The paper explores the influence of a voltage-dependent local load on electromechanical oscillations of a synchronous generator. The analysis is performed with different generator models, both with and without control devices. The classical static-load models were used as well as a generic model of dynamic load. It is shown that a voltage-dependent load can influence the damping of the electromechanical oscillations and thus the overall stability of the generator. This influence is very dependent on load parameters and on the generator´s parameters and operating conditions. It is also shown that the use of dynamic-load models instead of static can have a significant influence on the evaluation of the total effect that voltage-dependent loads have on electromechanical oscillations of the generator.