Modeling and Analysis of Wind turbine Driven Self-Excited Induction Generator Connected to Grid Interface with Multilevel H-Bridge Inverter

Abstract

This paper deals with the stator flux oriented vector control of wind driven self excited induction generator This paper presents an investigation of Hybrid nine level inverter (HNLI) used along with the voltage source rectifier unit as interface between Self excited induction generator and grid. Making use of HNLI benefits of low harmonics distortion, reduced number of switches to achieve the nine level output over the conventional cascaded nine level inverter and reduced switching losses results in improvement of the p.f at grid, to compensate the reactive power and to suppress the total harmonic reduction. The generated voltage of the wind driven self excited induction generator mainly depends on the wind velocity, appropriate excitation capacitance and grid conditions. The main objective of this paper is to track the maximum power of the grid connected SEIG driven by wind turbine. In previous literature there no discussion about the grid connected SEIG interface with the AC/DC link. The variable magnitude, variable frequency, voltage of the generator can be controlled by the proper modulation index.  The modulation index of the proposed HNLI is adjusted to obtain the maximum output power. The results are valid through MATLAB/SIMULINK software.

Keywords: Self excited induction generator (SEIG), Wind turbine, Hybrid nine level inverter, voltage source rectifier, grid.