莱姆传感器在变速恒频双馈式风力发电系统中的应用

为了实现双馈变速恒频风力发电系统中转子侧背靠背变流器双向能量流动的闭环检测与控制,文中给出了莱姆传感器在双馈风力发电系统中的应用.     

双馈型风力发电机变流器控制技术研究

本文以双馈型变速恒频风力发电系统的运行与控制为主题,从理论到实验进行了全面、深入的研究;设计并构建了一套完整的1650kW双馈型变速恒频风力发电实验系统,完成了变速恒频发电机运行试验、空载并网实验、变流器运行实验等一系列实验内容。丰富、详实的实验研究结果,验证了本文理论研究的正确性。     

变速恒频无刷双馈风力发电机的仿真研究

在介绍无刷双馈发电机及其变速恒频风力发电系统的基础上,基于无刷双馈电机转子参考轴d-q数学模型,采用恒压频比控制策略,在Matlab/Simulink下完成无刷双馈变速恒频发电控制的开环仿真研究。仿真结果验证了无刷双馈发电机变速恒频控制技术的正确性与有效性。     

变频技术在风电设备中的应用

主要围绕变频技术在风电设备中的应用展开研究,以变速恒频双馈风力发电机为研究对象。对发电系统中交流励磁控制方式常见的变频装置进行了比较分析,对选择的双PWM变换器交流励磁变速恒频风力发电系统的两个控制单元——网侧PWM变换器和转子侧PWM变换器进行了控制策略分析及仿真。     

变频技术在变速恒频异步风力发电系统中的应用

变速恒频异步风力发电技术,特别是双馈异步发电技术在风力发电中得到了广泛的应用。本文在阐述变频技术在风力发电系统应用的基础上,对变速恒频异步风力发电系统的不同的拓扑结构和控制策略进行了分析,并介绍了变速恒频双馈异步风力发电技术的研究热点以及北京清能华福风电技术有限公司的产品OHVERT-DFIG-1500B型变流器。     

无刷双馈风力发电控制策略研究

本文研究了为实现最大风能捕获和有功、无功功率解耦控制的无刷双馈发电机的定子磁链定向矢量控制策略,并建立了变速恒频双馈风力发电系统的仿真模型,通过仿真验证了理论、模型和控制策略的正确性、可行性。     

变速恒频双馈风力发电系统仿真研究

阐述变速恒频双馈风力发电系统工作原理,在分析双馈异步发电机的动态数学模型的基础上,介绍了一种基于定子磁链定向的矢量控制方法,实现对电机的有功功率和无功功率的解耦控制,进而实现最大风能追踪。在DFIG转子励磁电源的研究中,重点讨论基于电网电压定向矢量控制技术的网侧变换器的控制方法,以实现网侧变换器交流侧单位功率因数控制和直流环节电压控制。Matlab仿真结果证明了控制策略的正确性和有效性。     

变速恒频双馈风力发电机控制策略

本文基于对双馈感应发电机及其矢量控制的理论分析,采用基于速度外环的并网发电控制策略和基于变步长转速扰动的最大风能跟踪算法,构建了110kW变速恒频双馈风力发电模拟平台,实现了变速恒频双馈风力发电机的有功、无功功率的前馈解耦控制和最大功率点跟踪控制。     

变频技术在变速恒频异步风力发电系统中的应用

变速恒频异步风力发电技术特别是双馈异步发电技术在风力发电中得到了广泛的应用。本文在阐述变频技术在风力发电系统应用的基础上，对变速恒频肄步风力发电系统的不同的拓扑结构和控制策略进行了分忻．许给出了变速恒频双馈异步风力发电技术的研究热点。     

变速恒频风力发电用双PWM变换器的协调控制

文章首先分析了双馈风力发电机的原理以及其数学模型,然后分析了变速恒频风力发电技术采用双PWM变换器常规控制策略,在此基础上提出了采用双PWM变换器的协调控制策略。最后利MATLAB/SIMULINK软件对整个风力发电系统进行仿真。结果表明此策略实现了风力发电机的变速恒频运行,另外在定子电流变化的同时,保持了恒定的功率因数,实现了对双馈感应电机的有功功率和无功功率的独立控制。     

双馈风电机组低电压穿越问题研究

本文介绍了储能Crowbar和电网电压跌落时的无功需求,在此基础上本文提出了一种新的网侧变流器故障时无功控制策略,仿真验证了控制策略的有效性。接着提出了双馈电机风力发电系统低电压穿越的控制逻辑,在双馈电机风力发电系统仿真平台上运用Matlab/simulink,采用储能Crowbar和故障时无功控制策略以及叶尖速比控制等策略实现了双馈电机风力发电系统的低电压穿越。     

An Improved Control Strategy of Limiting the DC-Link Voltage Fluctuation for a Doubly Fed Induction Wind Generator

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.     

基于定子磁链定向的变速恒频双馈风力发电系统仿真研究

本文首先从电机基本原理出发,分析了双馈电机的等效电路以及在同步坐标和d-q坐标系下电机的数学模型,其次阐述了矢量控制原理和基于定子磁链定向的矢量控制策略,最后利用MATLAB 7.6仿真软件搭建了基于双馈感应发电机的变速恒频风力发电系统,并对仿真结果进行了分析研究。     

基于PSCAD的双馈风力发电机组低电压穿越的研究

针对双馈风力发电机组低电压穿越问题,研究了电网电压严重跌落情况下转子Crowbar电路、转子Crowbar和直流侧卸荷电路组成的组合保护电路的控制策略。基于PSCAD建立了双馈风力发电机组低电压穿越的仿真模型,验证了组合保护电路控制策略能够很好地抑制转子侧电流和直流侧电压的上升,实现低电压穿越。     

A Fault Tolerant Doubly Fed Induction Generator Wind Turbine Using a Parallel Grid Side Rectifier and Series Grid Side Converter

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.     

New Fuzzy Control Strategies Applied to the DFIG Converter in Wind Generation Systems

This paper presents new fuzzy control strategies which may be applied to the converter connected to the rotor of doubly fed induction generators (DFIG) composing a variable speed wind generation system connected to a real electrical grid. The fuzzy control proposed strategies are of the type supervised “look-up-table”. The performance of these intelligent controllers are compare with the fixed parameters PI controllers for fault ocurrence in the power system. The fuzzy controllers are supposed to better the transient performance of the electrical power system as compared with the conventional PI controllers. The obtained results from simulation studies have of the fuzzy controllers. To formulate the simulation studies an equivalent mathematical model of a significant number of wind turbines was implemented using the MATLABTM software packcage.