Dynamic and Pole-Zero Analysis of Self-Excited Induction Generator Using a Novel Model with Iron Losses

Abstract

In this paper, we propose and analyze a novel self-excited induction generator (SEIG) dynamic model with iron losses. The iron losses are represented by means of an equivalent iron loss resistance connected in parallel with the stator inductance. Moreover, the iron loss resistance is modeled as variable with respect to both synchronous frequency and magnetizing flux, whereas the magnetizing flux influence is expressed by means of the corresponding iron loss current. We determined this variation by performing a series of standard no load tests over a wide range of frequencies and using sinusoidal supply. In order to validate the performance of the proposed model, we carried out a number of simulations and experiments. The results obtained by the proposed model are compared with the results obtained by other commonly used SEIG models, as well as with the results obtained by measurement. All SEIG models were built in the MATLAB/Simulink environment. It is shown that, of all the considered models, the proposed model is the best choice for a comprehensive SEIG analysis because of the high accuracy, high numerical stability and low computational demands. For the same reasons, the proposed model is also a very good candidate for control system design. Finally, the pole-zero maps of two SEIG models and the corresponding pole-zero analysis are given for the first time in this paper.

Mateo Bašić

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with recent research interests related to the fields of power electronics and renewable energy sources, with a special focus on energy-efficient control of inverters, battery systems, wind turbines, photovoltaic sources and self-excited induction generators in microgrids - both in island operation and in grid-tie operation.

Dinko Vukadinović

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, specialized in modern control systems for power electronic converters, electric motors, and generators. At the Power Electronics Research Laboratory, he leads experimental projects and develops advanced methods for regulating electrical machines and converters, while supervising doctoral research in these areas.

Goran Petrović

Full Professor | Department of Electrical Measurements

Prof. dr. sc. Goran Petrović is a full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Architecture in Split. His research interests include measurement of electrical and process quantities, analysis of geoelectrical and geothermal features of the soil, instrumentation for smart grids, measurement and application of synchrophasors. He is the author of numerous papers published in top-tier scientific journals and contributed to valuable international and national scientific projects.