Sharing of Unbalanced Loads in an Isolated Distributed Generation System with Droop Controlled Doubly Fed Induction Generator

2014 ◽  
Vol 1070-1072 ◽  
pp. 264-269
Author(s):  
Bo Zhou ◽  
Heng Nian ◽  
Gan Li ◽  
Hua Bo Shi
Keyword(s):  
Distributed Generation ◽  
Control Strategy ◽  
Positive Sequence ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Generation System ◽  
Sequence Components ◽  
Stator Flux ◽  
Doubly Fed ◽  
Unbalanced Loads

If a doubly fed induction generator (DFIG) were to penetrate into a distributed generation system successfully, it should be able to adapt to autonomous and unbalanced conditions. To dealing with this situation, an indirect stator flux orientation (ISFO) control strategy with the droop method is introduced to cope with the positive sequence components of DFIG and provide the system with a solid voltage and frequency support. Meanwhile, a negative sequence droop is also proposed for DFIG so as to achieve a reasonable sharing of unbalanced loads and ensure the power supply quality at the point of common coupling (PCC). Finally, simulation results are provided to demonstrate the correctness of the suggested control strategy under autonomous and unbalanced conditions when DFIG is connected in parallel with a converter.

Implementation of direct power control based on stator flux estimation using low-pass filter estimator for doubly fed induction generator–wind energy conversion system

2018 ◽  
Vol 233 (7) ◽  
pp. 764-778 ◽  
Author(s):  
Ameni Kadri ◽  
Hajer Marzougui ◽  
Faouzi Bacha
Keyword(s):  
Control Strategy ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Direct Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Flux Estimation ◽  
Stator Flux ◽  
Doubly Fed

This article deals with the direct power control strategy applied for a grid-connected variable speed wind turbine based on doubly fed induction generator. The proposed method is based on a stator flux estimation algorithm which allows to control the rotor-side converter of the doubly fed induction generator. Several methods of stator flux estimation are based on the integration of the stator back electromotive force signal. However, in practice, the pure integration can cause various problems due to noises, stator resistance uncertainty, unknown initial conditions and measurement errors. Several algorithms, reported in the literature and used to estimate machine stator fluxes, are reviewed and compared. Particular attention is drawn to the low-pass filter–based algorithms that show good performances. In this article, the novelty of the proposed approach is the development of the direct power control–based stator flux estimation method with a low-pass filter. Theoretical analysis and implementation procedures of the proposed method are developed in detail. Simulation results of a variable speed wind turbine based on doubly fed induction generator are performed in MATLAB/Simulink software in order to evaluate the dynamic performances of the proposed control method under wind speed variations. The adopted control strategy is implemented using dSPACE 1104 board and tested for a wind turbine emulator. Experimental results show the effectiveness and the originality of the proposed control strategy.

The Control Strategy of the Rotor-Side PWM Converter Based on Doubly-Fed Induction Generator

2012 ◽  
Vol 542-543 ◽  
pp. 204-207 ◽  
Author(s):  
Mei Hua Zhao ◽  
Min Fan ◽  
Xiao Xin Wu
Keyword(s):  
Control Strategy ◽  
Wind Power Generation ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Generation System ◽  
Pwm Converter ◽  
Experimental Platform ◽  
Control Scheme ◽  
Power Generation System ◽  
Doubly Fed

This paper proposed a control strategy for rotor side PWM converter based on the stator voltage orientation. First, the mathematical models of Doubly-fed Induction Generator (DFIG) in a synchronous rotating coordinate system is derived .Then designed the control scheme for rotor side PWM converter. Finally, experimental platform for double-fed wind power generation system based on Infineon's XC2785 microcontrollers is established. The experimental results verify the feasibility and correctness of the control strategy.

The Regulation of Grid and Motor Side Converter of DFIG in LVRT

2011 ◽  
Vol 347-353 ◽  
pp. 1462-1465
Author(s):  
Kan Zhang ◽  
Su Juan Sun
Keyword(s):  
Control Strategy ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Close Coupling ◽  
Voltage Dip ◽  
Generator Type ◽  
Simulation And Experiment ◽  
Stator Flux ◽  
Doubly Fed ◽  
Rotor Side Converter

The most widely used generator type is the Doubly-Fed Induction Generator (DFIG). Because of the close coupling of the generator and the gird, the stator flux of DFIG is distorted while the Grid voltage dip happens. To achieve the LVRT, the LVRT control strategy of DFIG, especially the association of gird side and rotor side converter, is discussed under gird voltage dips. Simulation and experiment have been implemented to prove the idea.

Cooperated Control Strategy of DFIG Wind Power Generation System under Unbalanced Grid Condition

2013 ◽  
Vol 732-733 ◽  
pp. 1005-1009
Author(s):  
Ya Deng ◽  
Shu Ju Hu ◽  
Yan Feng Meng ◽  
Hong Hua Xu
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Control Strategy ◽  
Wind Power Generation ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Generation System ◽  
Power Generation System ◽  
Doubly Fed ◽  
Unbalanced Grid

This paper proposes a cooperated control of the grid side converter (GSC) and rotor side converter (RSC) in doubly-fed induction generator (DFIG) wind power generation system under unbalanced grid condition. Mathematical model of doubly-fed induction generator (DFIG) and GSC under unbalanced grid voltage condition are investigated. Dual-dq current control strategies of the RSC and GSC under unbalanced grid condition are detailed studied. A cooperated control strategy of the GSC and RSC under unbalanced grid condition is proposed to provide enhance operation of DFIG system. The GSC is controlled to remove the total active power fluctuation of the system and RSC is controlled to eliminate the DFIG electromagnetic torque oscillation. Simulation based on Matlab/Simulink of a 1.5 MW DFIG prototype was carried out to validate the proposed cooperated control strategy.

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