The controlling of the DFIG based on variable speed wind turbine modeling and simulation

Abstract

This paper presents the power outputs control and DC-link voltage regulation of the Doubly Fed Induction Generator (DFIG) for the variable speed Wind Energy Conversion System (WECS). The DFIG control structure consists of the two four quadrant IGBT PWM converters are connected in AC-DC-AC in order to control the power outputs of the DFIG. The dynamic behavior of DFIG is modeled in the Stator Flux Orientation (SFO) related to the Rotor Side Converter (RSC) and Grid Side Converter (GSC) control strategies. The RSC controls the power flow (the active and reactive power) from the stator of the DFIG to the grid by controlling the rotor currents of the DFIG. The GSC ensures the regulation of the DC-link voltage to the desired value by controlling the grid currents. In this paper, is realized with a conventional PI controller based on SFO vector control, which gives the super-synchronous operation of the DFIG. This control strategy not only improves the efficiency but also maintains almost unity power factor to the grid. The proposed control scheme is simulated and investigated for variations in wind speed and under small disturbance. The effectiveness of the proposed method is verified by developing the simulation model of 1.5 MW in MATLAB-SIMULINK-2013.