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An Improved Control Strategy of Limiting the DC-Link Voltage Fluctuation for a Doubly Fed Induction Wind Generator 总被引:2,自引:0,他引:2
Jun Yao Hui Li Yong Liao Zhe Chen 《Power Electronics, IEEE Transactions on》2008,23(3):1205-1213
The paper presents to develop a new control strategy of limiting the dc-link voltage fluctuation for a back-to-back pulsewidth modulation converter in a doubly fed induction generator (DFIG) for wind turbine systems. The reasons of dc-link voltage fluctuation are analyzed. An improved control strategy with the instantaneous rotor power feedback is proposed to limit the fluctuation range of the dc-link voltage. An experimental rig is set up to valid the proposed strategy, and the dynamic performances of the DFIG are compared with the traditional control method under a constant grid voltage. Furthermore, the capabilities of keeping the dc-link voltage stable are also compared in the ride-through control of DFIG during a three-phase grid fault, by using a developed 2 MW DFIG wind power system model. Both the experimental and simulation results have shown that the proposed control strategy is more effective, and the fluctuation of the dc-link voltage may be successfully limited in a small range under a constant grid voltage and a non-serious grid voltage dip. 相似文献
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A Fault Tolerant Doubly Fed Induction Generator Wind Turbine Using a Parallel Grid Side Rectifier and Series Grid Side Converter 总被引:3,自引:0,他引:3
With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride-through disturbances such as faults and support the grid during such events. Conventional modifications to the doubly fed induction generation (DFIG) architecture for providing ride-through result in compromised control of the turbine shaft and grid current during fault events. A DFIG architecture in which the grid side converter is connected in series as opposed to parallel with the grid connection has shown improved low voltage ride through but poor power processing capabilities. In this paper, a unified DFIG wind turbine architecture which employs a parallel grid side rectifier and series grid side converter is presented. The combination of these two converters enables unencumbered power processing and robust voltage disturbance ride through. A dynamic model and control structure for this architecture is developed. The operation of the system is illustrated using computer simulations. 相似文献
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《Industrial Electronics, IEEE Transactions on》2009,56(2):439-451
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Coordinated Control of DFIG's Rotor and Grid Side Converters During Network Unbalance 总被引:1,自引:0,他引:1
Lie Xu 《Power Electronics, IEEE Transactions on》2008,23(3):1041-1049
This paper proposes a coordinated control of the rotor side converters (RSCs) and grid side converters (GSCs) of doubly-fed induction generator (DFIG) based wind generation systems under unbalanced voltage conditions. System behaviors and operations of the RSC and GSC under unbalanced voltage are illustrated. To provide enhanced operation, the RSC is controlled to eliminate the torque oscillations at double supply frequency under unbalanced stator supply. The oscillation of the stator output active power is then cancelled by the active power output from the GSC, to ensure constant active power output from the overall DFIG generation system. To provide the required positive and negative sequence currents control for the RSC and GSC, a current control strategy containing a main controller and an auxiliary controller is analyzed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition whereas the auxiliary controller is implemented in the negative sequence (dq)- frame with negative sequence current extracted. Simulation results using EMTDC/PSCAD are presented for a 2 MW DFIG wind generation system to validate the proposed control scheme and to show the enhanced system operation during unbalanced voltage supply. 相似文献
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DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications 总被引:1,自引:0,他引:1
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为提高双馈风力发电机在电网电压跌落时的不间断运行能力,提出了双馈风力发电机(DIFG)转子侧变流器无功支持控制策略,并进行了仿真研究。仿真结果表明,该控制方案在不增加硬件成本的基础上提供无功支持,降低了电网压降,减少了直流母线电压波动,提高了双馈风力发电系统的低压穿越能力。 相似文献
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针对双馈型变速恒频风力发电系统的低电压穿越问题,提出一种新颖的转子侧保护电路。在建立电机的稳态和暂态数学模型的基础上,分析了电网电压发生跌落期间以及电压恢复后的双馈感应发电机的动态响应情况。仿真结果表明,在电压跌落时转子侧加入本文设计的Crowbar电路,能够有效抑制直流侧在电压跌落时电容电压的升高,并能减弱转子侧电流... 相似文献
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以垂直轴风轮(VAWT)和双馈感应发电机(DFIG)为研究对象,建立了包括风力机模型、传动系统模型和双馈电机模型的垂直轴双馈风力发电系统的数学模型及结构,采用双馈电机定子磁链定向前馈解耦控制,使得电机的有功分量和无功分量可以分别得到控制。运用Matlab/Simulink建立了系统仿真模型,对定子磁链定向前馈解耦控制策... 相似文献
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《Industrial Electronics, IEEE Transactions on》2008,55(12):4299-4308
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矩阵变换器是一种交交变频器,可以实现能量双向流动,适用于双馈电机交流励磁系统。文中主要研究了双馈型风力发电机矩阵变换器交流励磁控制系统的设计与实现,该控制策略是以定子电压和频率作为给定值,定子实际电压和转速作为负反馈,通过控制交流励磁,实现双馈电机定子电压和频率稳定输出。实验结果表明,在转速亚同步和超同步时,双馈电机定... 相似文献
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针对目前在风电系统最大风能捕获控制策略中应用较为广泛的功率控制方法,本文首先分析了当前此法中有关反馈量的选取所存在的误区,并通过仿真验证了理论分析结果。在此基础上,结合双馈风电系统的慢动态模型,通过对其功率控制的稳定性分析,给出了系统的闭环稳定性条件,结果表明,闭环系统的稳定性取决于控制器的参数以及系统的工作点。 相似文献
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在研究双馈型风力发电系统中网侧变流器基本工作原理的基础上,建立DFIG并网系统网侧变流器的数学及控制系统模型。为了更好地提升并网风电系统的控制效果,采用一种基于前馈解耦控制的双闭环控制策略对网侧变流器实行控制,以提高逆变波形及直流母线电压的稳定性。通过在仿真软件Matlab/Simulink中搭建模型进行仿真研究,验证控制策略的可行性及有效性。 相似文献
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Wind Speed Estimation Based Sensorless Output Maximization Control for a Wind Turbine Driving a DFIG 总被引:2,自引:0,他引:2
Wei Qiao Wei Zhou Aller J.M. Harley R.G. 《Power Electronics, IEEE Transactions on》2008,23(3):1156-1169
This paper proposes a wind speed estimation based sensorless maximum wind power tracking control for variable-speed wind turbine generators (WTGs). A specific design of the proposed control algorithm for a wind turbine equipped with a doubly fed induction generator (DFIG) is presented. The aerodynamic characteristics of the wind turbine are approximated by a Gaussian radial basis function network based nonlinear input-output mapping. Based on this nonlinear mapping, the wind speed is estimated from the measured generator electrical output power while taking into account the power losses in the WTG and the dynamics of the WTG shaft system. The estimated wind speed is then used to determine the optimal DFIG rotor speed command for maximum wind power extraction. The DFIG speed controller is suitably designed to effectively damp the low-frequency torsional oscillations. The resulting WTG system delivers maximum electrical power to the grid with high efficiency and high reliability without mechanical anemometers. The validity of the proposed control algorithm is verified by simulation studies on a 3.6MW WTG system. In addition, the effectiveness of the proposed wind speed estimation algorithm is demonstrated by experimental studies on a small emulational WTG system. 相似文献
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根据电网规程要求.在电网故障情况下风力发电机组应能保持与电网的连接并向电网不问断供电。文中建立了在电网故障情况下的双馈感应发电机(DFIC)的数学模型,然后分析了实现低电雁穿越(LVRT)的各种改进控制策略和技术方法。 相似文献
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Bilel Touaiti Mongi Moujahed Hechmi Ben Azza Mohamed Jemli 《International Journal of Electronics》2018,105(10):1769-1784
In this article, a fault-tolerant voltage source inverter (VSI) is proposed for a novel topology of stand-alone doubly fed induction generator (DFIG) feeding an isolated DC load. In this topology, stator and rotor sides of DFIG are connected to DC-bus through a diode rectifier and VSI, respectively. The fault-tolerant VSI includes a redundant leg connected by bidirectional switches in order to replace the faulted leg and improve the reliability of the proposed system. The field oriented control strategy is adopted to control the d and q-axis rotor currents in order to maintain the voltage and the frequency at the output of the generator constant. A novel, easy and fast approach for fault detection and isolation (FDI) of open-switch damage in insulated gate bipolar transistor-based VSI is proposed in this study. This approach is developed using mathematical transformations such as a hysteresis detector, an integrator and a trigger. The FDI algorithm proposed here does not require the knowledge of the system model and is independent from its complexity. Simulations results are illustrated for a 3.7 kW DFIG feeding a DC load with open-switch fault in VSI that confirm the concepts proposed in this study. 相似文献