Self-Excitation of Autonomous Generators. Part 2. Study of Self-Excitation of an Asynchronous Generator Inclusive of the Starter in the Form of Residual Voltage on Excitation Capacitors

Resumo

This paper presents the results of simulations of the process of self-excitation of the asynchronous generator by using a starter in the form of residual voltage on excitation capacitors. A generator model that was developed in the three-phase inhibited coordinate system and implemented in MATLAB Simulink is described. The results of simulations have shown that the use of the starter in the form of residual voltage on excitation capacitors is initially accompanied by a high-frequency decaying oscillatory process that proceeds smoothly in an increasing oscillation process with the frequency of the EMF generator. The role of the starter in the launch of a self-excitation process is considered. It was found that, during self-maintained conditions, i.e., the presence of positive feedback, it is sufficient to have an arbitrarily small starter to start the process of self-excitation. In addition, the time of self-excitation of the generator can increase to “arbitrarily large” values. It is shown that, in the case of a violation of self-maintained conditions, a powerful starter can change the parameters of the generator up to the establishment of self-maintained conditions followed by the launch of an asynchronous self-excitation.