Abstract
Given the increasing integration of wind-based generation systems into the electric grid, efforts have been made to deal with the problem of power quality associated with the intermittent nature of these systems. This paper presents a new modelling approach oriented towards harmonic distortion analysis of the induction machine for wind power applications. The model is developed using companion harmonic circuit modelling, which is a natural approach for analysis of the adverse effects of harmonic distortion in electric power systems, and represents an easier solution method than the well known dynamic harmonic domain, since it solves algebraic equations instead of state-space differential equations. The structure of the companion circuits simplifies both the formulation and solution for power systems with wind-based generation systems. This approach is especially useful for analysis of the harmonic interaction in transient and steady states between the wind power generator and the power system, whose interconnection is made through electronic converters. The proposed model allows us to compute the dynamics of the wind turbine, which are influenced by disturbances such as changes in the wind velocity, voltage fluctuations, electric waveform distortion, and mechanical vibrations, among other factors. Moreover, the cross-coupling between harmonic components at different frequencies is considered. The proposed model represents an integral framework of the electrical and mechanical subsystems of a wind turbine, allowing for analysis of the interactions between them, and understanding power quality degradation behaviour as well as causes and consequences, while also giving useful information on the field of simulation and control. To test the performance of the proposed model, a test power system is used to obtain the behaviour of a wind turbine induction generator in response to typical power quality disturbances, i.e., harmonic distortion, and voltage sags and swells. Then, the dynamics of the variables considering their harmonic interactions are analysed.
Highlights
Climate change has led to a continuous worldwide search for knowledge related to cleaner sources of energy
To demonstrate the performance of the proposed model, the test system shown in Figure 3 was used to analyse the behaviour of a wind turbine induction generator (WTIG) under typical power quality disturbances, and, analyse the dynamics of the variables considering their harmonic interaction
An efficient model based on the dynamic harmonic domain has been proposed for the induction generator
Summary
Climate change has led to a continuous worldwide search for knowledge related to cleaner sources of energy. An approach to modelling all the components (i.e., the power system, power electronics, electric generator and wind turbine drive train) in the same system, while considering the cross-coupling between the harmonic content, would increase the accuracy and reliability of the obtained results In this contribution, a model of a wind turbine generator is proposed that preserves all the advantages of the dynamic harmonic domain domain DHD, ( known in the literature as the extended harmonic domain, dynamic phasor, or shifted frequency), but is so much simpler since algebraic equations are proposed instead state-space differential equations, as is common in DHD.
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