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Effect of Rotor Current Control for Wound Rotor Induction Generator on the Wind Turbine Performance  [cached]
Mahmoud Rabie Barakat
International Journal of Power Electronics and Drive Systems , 2012, DOI: 10.11591/ijpeds.v2i2.213
Abstract: This paper presents the effect of rotor current control of wound rotor induction generator driven by wind turbine during different operation modes when varying the rotor resistance. The studied modes are wind speed variation, starting especially at high wind speed. Moreover, the effect of the proposed control on short circuit and critical fault clearing time is investigated.
Performance Analysis of Doubly Excited Brushless Generator with Outer Rotor for Wind Power Application  [cached]
Yingchao Zhang
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i3.606
Abstract: In this paper, a novel doubly excited brushless generator (DEBG) with outer radial laminated magnetic barrier rotor (RLMB-rotor) for wind power application was designed and analyzed. The DEBG has 10 rotor pole numbers with outer rotor. Its performance is investigated using the 2D transient finite element method. The magnetic fields, torque capability, end winding voltage characteristics, radial magnetic force and energy efficiency were analyzed. All studies in this paper show that the simplicity, reliability, high efficiency and low vibration and noise of the DEBG with outer rotor are attractive for variable speed constant frequency (VSCF) wind power generation system.
双馈风力机转子动能在系统频率 跌落时的响应能力分析
Response Ability Analysis for Doubly??Fed Wind Generator Rotor Kinetic Energy as System Frequency Falling
 [PDF]

桑懿谦,夏俊荣,戴义平,赵嘉
- , 2017, DOI: 10.7652/xjtuxb201711018
Abstract: 针对转子动能参与调频的研究主要集中于控制策略上,并未详细、定量研究不同工况下转子释放动能的问题,以1.5 MW某双馈风力发电机为原型、采用Matlab/Simulink软件建立了简化的风力机动态模型,并以1.5 MW风力发电机的实时运行数据验证了该模型的正确性;同时,提出了转子释能持续时间的概念,并在所建的风力机动态模型下得到中低风速(6~8 m/s)下机组转子释放动能的能力随着风速的变化,继而设计了转子惯性响应控制器,研究了不同风速下风力机在系统频率跌落时的响应能力,得到转速及功率输出的响应曲线。研究结果表明:所提模型具有普遍的适用性;在相应研究条件下,风力机转子释能时间可达15 s,风力机输出可增加约15%的有功功率;风速在6~8 m/s下,风电机组转子释放动能的能力随着风速的增加而降低。该结果可为双馈感应风力发电机参与电网调频的研究提供参考。
Studies of rotor kinetic energy participating in frequency regulation are mainly focused on the control strategies, and less attention is paid on the ability of rotor releasing kinetic energy under different working conditions. A simplified dynamic simulation model of a 1??5 MW doubly??fed induction wind turbine generator (DFIG) was established with Matlab/Simulink, and verified by the operating data of a 1.5 MW wind turbine generator. The duration time was proposed and the variation of the ability of rotor releasing kinetic energy was obtained in a low and middle speed region (6??8 m/s). Then a rotor inertial response controller was designed. The dynamic responses under different wind speed conditions were investigated as the system frequency falls, and the response curves of revolving speed and active power were completed. The results show the general applicability of this model. The time of rotor releasing energy reaches up to 15 s, and the active power increases by 15%. The ability of rotor releasing kinetic energy decreases with the increasing wind speed from 6 m/s to 8 m/s
Utilization of Wind Energy at High Altitude  [PDF]
Alexander Bolonkin
Physics , 2007,
Abstract: Ground based, wind energy extraction systems have reached their maximum capability. The limitations of current designs are: wind instability, high cost of installations, and small power output of a single unit. The wind energy industry needs of revolutionary ideas to increase the capabilities of wind installations. This article suggests a revolutionary innovation which produces a dramatic increase in power per unit and is independent of prevailing weather and at a lower cost per unit of energy extracted. The main innovation consists of large free-flying air rotors positioned at high altitude for power and air stream stability, and an energy cable transmission system between the air rotor and a ground based electric generator. The air rotor system flies at high altitude up to 14 km. A stability and control is provided and systems enable the changing of altitude. This article includes six examples having a high unit power output (up to 100 MW). The proposed examples provide the following main advantages: 1. Large power production capacity per unit - up to 5,000-10,000 times more than conventional ground-based rotor designs; 2. The rotor operates at high altitude of 1-14 km, where the wind flow is strong and steady; 3. Installation cost per unit energy is low. 4. The installation is environmentally friendly (no propeller noise). -- * Presented in International Energy Conversion Engineering Conference at Providence., RI, Aug. 16-19. 2004. AIAA-2004-5705. USA. Keyword: wind energy, cable energy transmission, utilization of wind energy at high altitude, air rotor, windmills, Bolonkin.
Sizing of Converters Interfacing the Rotor of Wind Driven DFIG to the Power Grid  [PDF]
Mahmoud Abdel Halim Saleh, Mona Naguib Eskander
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.23034
Abstract: In this paper, the operation of the Double Fed Induction Generator (DFIG) in the range from synchronous speed down to sub-synchronous speeds is analyzed using the power-flow approach. The objective of this analysis is to determine a ceiling for the rating of the converter interfacing the rotor of the wind driven double fed induction generator (DFIG) to the grid. Sizing the converter is an important issue in determining the economic viability of using the DFIM as a generator at synchronous and sub-synchronous speeds in wind energy conversion systems. The size of the converter is proved to be less than 10% of the rated power of the DFIG, which is 40% to 67% lower than that estimated in previous publications.
Control of Doubly-Fed Induction Generator System for Wind Turbines
Viorica Spoial?,Helga Silaghi,Drago? Spoial?
Journal of Computer Science and Control Systems , 2008,
Abstract: The paper realizes the analysis, modelling and control of the doubly-fed induction generator (DFIG) for wind turbines. Different control methods are investigated with the objective of eliminating the influence of the back electromotive force (EMF), which is that of, in control terminology, a load disturbance, on the rotor current.
Using of High Altitude Wind Energy  [PDF]
Alexander Bolonkin
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.22010
Abstract: Ground based, wind energy extraction systems have reached their maximum capability. The limitations of current de-signs are: wind instability, high cost of installations, and small power output of a single unit. The wind energy industry needs of revolutionary ideas to increase the capabilities of wind installations. This article suggests a revolutionary innovation which produces a dramatic increase in power per unit and is independent of prevailing weather and at a lower cost per unit of energy extracted. The main innovation consists of large free-flying air rotors positioned at high altitude for power and air stream stability, and an energy cable transmission system between the air rotor and a ground based electric generator. The air rotor system flies at high altitude up to 14 km. A stability and control is provided and systems enable the changing of altitude. This article includes six examples having a high unit power output (up to 100 MW). The proposed examples provide the following main advantages: 1) Large power production capacity per unit—up to 5,000 - 10,000 times more than conventional ground-based rotor designs; 2) The rotor operates at high altitude of 1 - 14 km, where the wind flow is strong and steady; 3) Installation cost per unit energy is low; 4) The installation is environmentally friendly (no propeller noise).
Variable-speed control for a permanent-magnet generator with exterior rotor
外转子永磁风力发电机变速直驱控制系统

YAO Xing-jia,SHAO Dong,SHAN Guang-kun,XIE Ci-jian,
姚兴佳
,邵冬,单光坤,谢赐戬

控制理论与应用 , 2008,
Abstract: Exterior rotor generator improves the efficiencies of wind and wind-energy conversion. Its mathematical model is built in this paper. Based on the characteristics of the double PWM frequency changer, we propose a control strategy for controlling the converter. By means of the AC-DC-AC converter, we convert the generator output with varying-frequency and varying-amplitude into a constant-frequency AC for applications. The optimal usage of wind power is also realized.
Grid Connected Doubly Fed Induction Generator Wind Energy Conversion System Using Fuzzy Controller
Pooja Dewangan,,Prof. S. D. Bharti
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: This paper presents the simulation and control of a grid connected doubly-fed induction generator driven by a variable speed wind turbine. Fuzzy logic control strategy is applied to doubly fed induction generator (DFIG). The Matlab/Simulink/SimPowerSystems software is used to Simulate all the components of grid connected doubly fed induction generator (DFIG)-based wind power conversion system (WPCS). DFIG consists of a common wound rotor induction generator with slip ring and a back to back voltage source convertor. Fuzzy logic controller is applied to both grid side convertor (GSC) for dc link voltage control and rotor side convertor (RSC) for active and reactive power control. Coordinated control of the grid- and rotor side converters (GSC and RSC, respectively) is presented in the positive synchronous reference. Use of DFIG in wind turbine is widely spreading due to its control over DC voltage and active and reactive power. Conventional dq axis current control using voltage source converters for both the grid side and the rotor side of the DFIG are analyzed and simulated. Simulation results prove the excellent performance of fuzzy control unit as improving power quality and stability of wind turbine.
A Gain Scheduled Method for Speed Control of Wind Driven Doubly Fed Induction Generator  [PDF]
Wei Wang, Kang-Zhi Liu, Tadanao Zanma
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.51B016
Abstract: This paper proposes a gain scheduled control method for a doubly fed induction generator driven by a wind turbine. The purpose is to design a variable speed control system so as to extract the maximum power in the region below the rated wind speed. Gain scheduled control approach is applied in order to achieve high performance over a wide range of wind speed. A double loop configuration is adopted. In the inner loop, the rotor speed is used as the scheduling parameter, while a function of wind and rotor speed is used as the scheduling parameter in the outer loop. It is verified in simulations that a high tracking performance has been achieved.
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