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Performance of PI controller for control of active and reactive power in dfig operating in a grid-connected variable speed wind energy conversion system

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Frontiers in Energy 2014年第3期8卷 371-378页

作者： Azzouz TAMAARAT Abdelhamid BENAKCHA Laboratoire LGEB Biskra University Biskra City 07000 Algeria

Due to several factors, wind energy becomes an essential type of electricity generation. The share of this type of energy in the network is becoming increasingly important. The objective of this work is to present the modeling and control strategy of a grid connected wind power generation scheme using a doubly fed induction generator （dfig） driven by the rotor. This paper is to present the complete modeling and simulation of a wind turbine driven dfig in the second mode of operating （the wind turbine pitch control is deactivated）. It will introduce the vector control, which makes it possible to control independently the active and reactive power exchanged between the stator of the generator and the grid, based on vector control concept （with stator flux or voltage orientation） with classical PI controllers. Various simula- tion tests are conducted to observe the system behavior and evaluate the performance of the control for some optimization criteria （energy efficiency and the robustness of the control）. It is also interesting to play on the quality of electric power by controlling the reactive power exchanged with the grid, which will facilitate making a local correction of power factor.

关键词： wind power doubly fed induction generator（DFIG） vector control active power reactive power,maximum power point tracking （MPPT）

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Load frequency control in deregulated power system with wind integrated system using fuzzy controller

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Frontiers in Energy 2013年第2期7卷 245-254页

作者： Yajvender Pal VERMA Ashwani KUMAR Department of Electrical & Electronics Engineering UIET PanjabUniversity Chandigarh 160014 India Department of Electrical Engineering National Institute of TechnologyKurukshetra Haryana 132119 India

This paper presents the analysis of load frequency control （LFC） of a deregulated two-area hydro-thermal power system using fuzzy logic controller, with doubly fed induction generators （dfigs） integrated into both the control areas. The deregulation of power sector has led to the formation of new companies for generation, transmission and distribution of power. The conventional two-area power system is modified to study the effects of the bilateral contracts of companies on the system dynamics. Deregulation creates highly competitive and distributed control environment, and the LFC becomes even more challenging when wind generators are also integrated into the system. The overall inertia of the system reduces, as the wind unit does not provide inertia and isolates from the grid during disturbances. The dfigs integrated provide inertial support to the system through modified inertial control scheme, and arrests the initial fall in frequency after disturbance. The inertial control responds to frequency deviations, which takes out the kinetic energy of the wind turbine for improving the frequency response of the system. To enhance the participation of the doubly fed induction generator （dfig） in the frequency control, optimal values of the speed control parameters of the dfig-based wind turbine have been obtained using integral square error （ISE） technique. The dynamics of the system have been obtained for a small load perturbation, and for contract violation using fuzzy controller.

关键词： frequency regulation fuzzy controller deregulated power system doubly fed induction generator（DFIG） bilateral contract

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Very short-term wind speed prediction-based inertial control of a dfig wind farm

Very short-term wind speed prediction-based inertial control...

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第36届中国控制会议

作者： Yun Lu Jinqiang Liu Xiaoru Wang Southwest Jiaotong University

ISBN: (纸本)9781538629185

Rapid growth of wind power penetration brings difficulties in maintaining the power system frequency stability after a large active power disturbance.It is specified in some countries that wind farms must provide frequency support functions.To properly exploit the kinetic energy stored in the doubly fed induction generator（DFIG） to support the frequency regulation,especially considering the realistic wind speed variation during the transient process,a very short-term wind speed prediction（VSWSP）-based inertial control scheme is proposed in this paper,including the rate of change of frequency（ROCOF） and droop loops.Two loop gains are adjusted based on the predicted average wind speed in the future 10 seconds,which enables the inertial control adaptive to the wind speed variation during the transient process.Simulation results indicate that the proposed scheme shows better performance than conventional fixed gain scheme in terms of improving the frequency nadir and preventing the dfig from over-deceleration during the inertial control.

关键词： Inertial control scheme doubly fed induction generator（DFIG） very short-term wind speed prediction adaptive loop gains wind speed variation

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A New Method to IMprove the LVRT of dfig Based on the Current Compensation

A New Method to IMprove the LVRT of DFIG Based on the Curren...

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第三十届中国控制会议

作者： CHEN Jinmei~1,XUE Ancheng~1,TIAN Chunguang~2,BI Tianshu~1,GAO Changzheng~2 1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing 102206,P.R.China 2.Electric Power Research Institute,Jilin Electric Power Company Limited,Changchun 130021,P.R.China

＜正＞doubly fed induction generator（DFIG） has been widely used as its converter capacity is small.However,the low voltage ride through（LVRT） of dfig is still a problem.This paper proposed a new LVRT controller based on the philosophy of current compensation.First,base on the Laplace Transform,this paper analyzes the rotor and stator current transients under the grid fault,focused on the influence of the stator DC flux.And then,it proposes a combination control strategy consisting of current compensation control and DC crowbar control improve the LVRT of dfig.The simulation with the RTDS verified the effectiveness of the proposed control strategy.

关键词： doubly fed induction generator（DFIG） Low Voltage Ride Through（LVRT） Current Compensation Crowbar

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