Results of research on stabilizing the output voltage during transient processes in an asynchronous generator

Abstract

Relevance: the share of electricity generated from renewable sources is steadily increasing, therefore, the use of wind and hydrogenerators, as well as the development of their automatic control systems, is gaining particular relevance. In the composition of such alternating current generators, synchronous electric machines, as well as as asynchronous machines with a phase and short-circuited rotor, are used. Frequency converters installed in the stator and rotor circuits of asynchronous machines allow for controlling their excitation processes, but for starting the generation, it is necessary to use additional external power sources. Due to the residual magnetization in the magnetic core, by connecting capacitor banks to the stator windings of an asynchronous machine with a short-circuited rotor, it is possible to ensure the self-excitation process, as well as such requirements as the stability of the output voltage. The proposed method of capacitor excitation allows for the adaptation of the generator unit to changes in operating modes under decentralized, i.e., autonomous power supply conditions. In this article, based on the results of the conducted experiments, oscillograms reflecting the value of the output voltage in the transient processes of an asynchronous generator (AG) with a 4 kW short-circuited rotor were obtained and analyzed.

Aim: stabilization of the output voltage in transient processes when the load of the autonomously operating AG changes, and analysis of the obtained results.

Methods: methods for analyzing established and transient processes in electric power systems based on experiments were used.

Results: autonomous systems must meet requirements such as the simplicity of power supply design, ease of maintenance, relatively small mass (kVA/kg), and volume, as well as the stability of output parameters. Based on the analysis, appropriate proposals will be submitted for the use of AG in renewable energy sources.