Modeling of a Dual Stator Induction Generator with and Without Cross Magnetic Saturation

Abstract

This paper discusses general methods of modelling magnetic saturation in steady-state, two-axis (d & q) frame models of dual stator induction generators (DSIG). In particular, the important role of the magnetic coupling between the d-q axes (cross-magnetizing phenomenon) is demonstrated, with and without cross-saturation. For that purpose, two distinct models of DSIGs, with and without cross-saturation, are specified. These two models are verified by an application that is sensitive to the presence of cross-saturation, to prove the validity of these final methods and the equivalence between all developed models. Advantages of some of the models over the existing ones and their applicability are discussed. In addition, an alternative is given to evaluate all saturation factors (static and dynamic) by just calculating the static magnetizing inductance which is simply the magnitude of the ratio of the magnetizing flux to the current. The comparison between the simulation results of the proposed model with experimental results gives a good correspondence, especially at startup.

A nonlinear saturation model of synchronous machines with account cross saturation

“…A comparison between a new model, in which the effect of the cross-magnetizing phenomenon is included, and models with cross-saturation, is presented. Simulation verification of all the models for the two methods and of the inclusion of the crossmagnetizing phenomenon in the two-axis frame models is also reported (Marwa et al, 2013;Slimene et al, 2015aSlimene et al, , 2015b.…”

“…Obviously, when considering the different currents and fluxes as state space variables, the number of synchronous machines models is higher than known. Synthesis of possible models is rarely treated in the literature, except in Marwa et al (2014), Khlifi et al (2016), Levy (1986), and recently in Slimene et al (2015aSlimene et al ( , 2015b. In all cases, the subject is treated separately for synchronous machines.…”

Analysis of an off-grid self-excited dual wound asynchronous generator for wind power generation

“…* Wind energy conversion systems (WECS) are generally equipped with dual stator asynchronous wind power generators functioning at variable speed. For fixed-pitch turbines operating in partial load, maximum energy capture available in the wind generator can be achieved if the turbine rotor operates on the Optimal Regime Characteristic (ORC) (Slimene et al, 2015a;2015b). This regime can be obtained by tracking some target variables: the optimal rotational speed, depending proportionally on the wind speed, or the optimal rotor power (Marwa et al, 2014;Khlifi and Alshammari, 2014).…”

Voltage and frequency regulation for autonomous induction generators in small wind power plant

“…*Induction machines with cage rotors in isolated regions are invariably used for generation of electricity from wind. Self-excited induction generators (SEIG) are reported to be suitable for small scale wind power plants (Slimene and Khlifi, 2017;García et al, 2018) because of their advantages such as low price, robustness, ease of maintenance, self-protection, easy maintainability, availability and capability to produce electrical power even at variable speed (Slimene et al, 2015a;Pathak et al, 2015;Joshi et al, 2006). These may be operated on/off grid-connected.…”

“…Induction generators play an important role in renewable energy sources such as wind and hydraulic energy. Moreover, self-excited induction generators (SEIG) have been used to operate as wind-turbine generators in an autonomous mode (Slimene et al, 2015a;2015b;Khlifi et al, 2016).…”