Modeling and control of a doubly fed induction generator for grid integrated wind turbine

Abstract

This paper presents the modeling, simulation and control of a grid connected doubly fed induction generator (DFIG) coupled with the wind turbine. Among all the renewable energy resources, wind energy is rapidly gaining interest of developed as well as underdeveloped countries. Due to the increase in demand of electrical energy and increase in environmental pollution the use of wind energy to meet the domestic and industrial power demands is essential and inevitable. The main benefit is the production of economically justified and ecofriendly energy in bulk quantity. Because of the irregularity of wind speed, the output of wind turbine varies and that is why, variable speed wind turbines are more practical these days. In order to integrate the variable output of the wind turbine with the power grid, doubly fed induction generators are used due to their inherent advantages like active and reactive power control, absence of large capacitive banks and improved power quality. A DFIG is modeled using the electric equivalent circuit and dq 0 transformation along with the stator flux oriented vector control approach is used to decouple active and reactive power. Back to back power converters serve the purpose of controlling active and reactive powers at sub/super synchronous speeds. So the implementation of the proposed scheme ensures the constant output frequency and voltages with the control of active and reactive power and is highly suitable for grid integration in Distributed Generation (DG) Applications. The proposed scheme is implemented in SIMULINK / MATLAB environment and the simulation results validate the efficacy of the proposed scheme.

Efficiency Comparison of AC and DC Distribution Networks for Modern Residential Localities

“…where 'η' is the efficiency of the DC-AC converter as a function of percentage loading 'l'. In (5), the efficiency of the converter is the function of percentage loading. The curves and their corresponding equations are presented in the subsequent section.…”

“…Similarly, the percentage loading is placed in the curve equation of the DC-AC converter, which gives the efficiency of converter for each hour. The same equation as (5), with required modifications, can be derived for converters driving 'D' category loads.…”

“…DC made its move with the trending renewable energy technologies, threatening AC at the generation end. The solar PV generates DC power; wind farms have a topology, which produces DC at an intermediate stage for conversion to stable and synchronized AC output [5]. Advancement in power electronics enables both conversions between AC and DC as well as voltage level transformation.…”

Regulation of Frequency and Load Flow Study in a Multi-Area Power System Under Contingencies with the Inclusion of Wind-Generation

“…The wind generator considered in this paper is a doubly fed induction generator suitable for controlling the power output of the generator, as the stator and the rotor are controllable [8]. Here the stator output terminals are tapped and a part of the power generated is used to control the rotor.…”

Wind energy conversion system under a supervisor deterministic finite state machine

“…The technology of WECS having variable-speed and variable-pitch (VSVP) has been reported as having enhanced performance due to advantageous energy capturing when compared with other conventional technology for WECS [2,3]. Also, amongst the electrical generators available for equipping WECS having VSVP, the option for the doubly-fed induction generator (DFIG) stands out in industry and became the mainstream choice [4,5]. Advanced control techniques on the DFIG have been researched and developed with the objective of enhancing the quality of energy injected into the electric grid [6].…”