Control of a wind energy conversion system equipped by a DFIG for active power generation and power quality improvement

Abstract

a b s t r a c tThe aim of this paper is to improve the reactive power compensation and active filtering capability of a Wind Energy Conversion System (WECS). The proposed algorithm is applied to a Doubly Fed Induction Generator (DFIG) with a stator directly connected to the grid and a rotor connected to the grid through a back-to-back AC-DC-AC PWM converter. The control strategy of the Rotor Side Converter (RSC) aims, at first, to extract a maximum of power under fluctuating wind speed. Then, depending on the rate power of the RSC, the power quality can be improved by compensating the reactive power and the grid harmonics current due to nonlinear loads. Hence, the RSC is controlled in order to manage the WECS function's priorities, between production of the maximum active power captured from the wind, and power quality improvement. The main goal of the proposed control strategy is to operate the RSC at its full capacity, without any over-rating, in terms of reactive power compensation and active filtering capability. Elsewhere, the Grid Side Converter (GSC) is controlled in such a way to guarantee a smooth DC voltage and ensure sinusoidal current in the grid side. Simulation results show that the wind turbine can operate at its optimum power point for a wide range of wind speed and power quality can be improved. It has been shown also that the proposed strategy allows an operating full capacity of the RSC in terms of reactive power compensation and active filtering.

A Concise Presentation of Doubly Fed Induction Generator Wind Energy Conversion Systems Challenges and Solutions

“…Active filters are also used, some utilizing the extra capacity in RSC or GSC, for active filtering of harmonics by compensating the reactive power and harmonic currents. Hybrid filters, consisting of active and passive filters, are also an option [23][24][25][26].…”

Influencia de las ráfagas de viento en la calidad de la energía de los parques eólicos

“…De esta forma podemos disminuir las perturbaciones del sistema y conectar hacia el sistema interconectado la producción de energía de las turbinas de viento (Olamaei et al, 2012), (Boutoubat et al, 2013).…”

A Comparison between Voltage and Reactive Power Feedback Schemes of DFIGs for Inter-Area Oscillation Damping Control

“…Among the various wind power generators, a doubly fed induction generator (DFIG) is the most widely used one in wind energy conversion systems [1]. As the penetration level of DFIGs increases, their impact on system stability has been recognized [2,3].…”