大型风力发电机变桨距控制的建模及仿真研究

采用机理建模方法建立变桨距风力发电机组的各个部件的子模型,包括风速、风轮、传动系统和发电机模型,然后组合成整个机组的数学模型,并采用PID控制算法实现风力发电机组在低风速及高风速下对风能利用率的最大化,最后运用Matlab软件的Simulink环境进行仿真验证。     

基于Matlab/Simulink的双馈感应风力发电机组建模和仿真研究

以双馈风力发电机组为研究对象,建立了包括风力机、传动部分、双馈感应发电机、定子磁链定向的矢量控制策略、最大风能捕获策略的整体数学模型;应用matlab软件中simulink工具,以建立的数学模型为基础搭建了双馈风力发电机组仿真模型,并以两次阶跃风速为例对所建模型并网后运行特性进行了仿真研究。实现了双馈风力发电机组的最大风能捕获和功率解耦控制,仿真结果表明,双馈风力发电机组具有良好的运行特性,同时验证了所建模型的正确性和有效性。     

基于Matlab/Simulink的永磁直驱风力发电机组建模和仿真研究

以永磁直驱风力发电机组为研究对象,建立了包括风力机、传动部分、永磁直驱发电机、矢量控制策略、最大风能捕获策略的整体数学模型;应用Matlab/Simulink工具,以建立的数学模型为基础搭建了永磁直驱风力发电机组仿真模型,并以两次阶跃风速为例对所建模型并网后运行特性进行了仿真研究。实现了永磁直驱风力发电机组的最大风能捕获和功率解耦控制,仿真结果表明,永磁直驱风力发电机组具有良好的运行特性,同时验证了所建模型的正确性和有效性。     

基于PID控制的变速恒频风力发电机组液压变桨距控制系统研究

文章分析了变桨距控制原理,对变速恒频风力发电机组各部分数学模型进行了分析与研究,在此基础上,建立了变速恒频风力发电机组PID液压变桨控制系统仿真模型,在matlab/simulink环境下对未加PID控制器与加PID控制器两种情况下的系统进行了仿真研究。仿真结果表明,PID控制器能改善风力机桨距控制效果,更好地捕获风能,稳定风力机功率输出。     

无刷双馈风力发电机组的自抗扰功率解耦控制

对无刷双馈风力发电机组稳态运行时的功率分配关系进行了详细分析,在此基础上确定了最大风能捕获的控制策略.将自抗扰控制应用到无刷双馈电机有功功率与无功功率的解耦控制,将功率控制系统分解为有功功率子系统和无功功率子系统,从而建立了风力发电机组完整的功率控制模型.基于Matlab/Simulink的仿真结果表明无刷双馈风力发电机组自抗扰控制成功实现了有功功率与无功功率的解耦控制,不仅能够实现最大风能捕获,而且可以根据电网的实际需求调节机组无功功率的输出,验证了控制算法的有效性.     

永磁风力发电机组抗饱和控制器设计

风力发电是利用风能转化为电能的一种清洁能源技术。风能是一种无公害的可再生的清洁能源。提出两种风力发电机组速度控制环节的抗积分饱和控制方法。应用该方法分别在永磁风力发电机组的矢量控制算法中对系统进行控制,并且在速度控制器中对其进行使用,以此来降低电机速度控制中的过饱和部分。     

浓缩风能型风力发电提水系统及其仿真研究

将浓缩风能型风力发电机组应用于提水系统,设计控制系统,满足功率控制和最大风能捕获的要求,应用Matlab/Simulink建立该系统仿真模型,对风速阶跃变化情况进行仿真,证明了该系统的合理性及控制策略的可行性和正确性.     

双馈风力发电机组并网控制策略及性能分析

为了实现双馈风力发电机组无冲击电流并网,基于电网电压定向矢量控制技术,提出了一种考虑转子电流动态调节特性的双馈风力发电机组空载并网控制策略。基于Matlab/Simulink仿真平台,建立了双馈风力发电机系统及其并网控制的数学模型,并对不同初始运行转速的双馈风力发电机组的自动并网运行特性进行了仿真。仿真实验结果证明无论初始转速为同步转速,还是超、亚同步转速,利用提出的并网控制策略,双馈风力发电机组能很好快速地建立定子电压,并网过渡过程定子电流基本没有冲击。     

一种风力发电机组偏航系统的优化设计

作为风力发电机组的关键部件,偏航系统的设计精确性直接决定着机组的使用寿命。文章提出了一种偏航系统的优化控制设计方案,采用的方法是基于功率控制的爬山算法,这种方法可以改善风向变化的绝对值小于15°时偏航控制系统的精度。为验证其准确性,采用Matlab仿真软件建立的偏航控制系统仿真模型进行了仿真实验。仿真结果表明,采用爬山算法可以在保证风能最大捕获的基础上,提高偏航控制系统的精度,优化风力发电机组的偏航控制系统。     

基于额定风速以上的风力机变桨控制研究

变桨控制系统是变速变桨风力发电机组的重要组成部分,它不仅关系到大型MW级风力发电机组的安全运行,而且能控制风力发电机组,使其吸收更多的风能。文章基于2.0 MW变速变桨风力发电系统,采用PI控制策略,提出了增益调度控制算法,计算了PI增益随风速变化而变化的数值。通过调用线性化结果文件,设计了风力发电机组控制器回路,得出了满意的响应结果。最后基于GL规范,在湍流风的情况下对关键零部件是否加控制策略所得到的载荷进行了对比,结果显示关键零部件的载荷有显著降低,满足控制策略设计的要求。     

Wind-Turbine Model for System Simulations Near Cut-In Wind Speed

This paper presents a wind-turbine model for energy capture and switching simulation at lull wind conditions. The model includes aerodynamics as well as the control parts. It allows to study turbine behavior dependent on different controller settings and wind-speed characteristics. Based on such simulations, control parameters can be optimized regarding energy capture and turbine profits near cut-in wind speed. This was applied to a standard 1.5-MW wind turbine. Model validation was done using measurement data of different wind turbines. The model is kept as simple as possible considering the modeling of system components. However, all simplifications taken are allowable for energy capture and switching simulation. They guarantee shortest simulation times.     

Modeling and control of a wind fuel cell hybrid energy system

This paper describes a hybrid energy system consisting of a 5 kW wind turbine and a fuel cell system. Such a system is expected to be a more efficient, zero emission alternative to wind diesel system. Dynamic modeling of various components of this isolated system is presented. Selection of control strategies and design of controllers for the system is described. Simnon is used for the simulation of this highly nonlinear system. Transient responses of the system for a step change in the electrical load and wind speed are presented. System simulation results for a pre-recorded wind speed data indicates the transients expected in such a system. Design, modeling, control and limitations of a wind fuel cell hybrid energy system are discussed.     

双馈风力发电系统最大风能追踪控制的研究

在分析了风力机功率特性和DFIG运行特性的基础上,通过对双馈机转速控制进行最大风能追踪具体过程的深入研究,提出了一种基于最大风能追踪的双馈电机有功、无功功率的解耦控制方法。建立了基于发电机定子磁链定向矢量控制的双馈风力发电系统最大风能追踪系统模型,并利用PSCAD/EMTDC对其进行仿真,结果验证了控制策略的正确性。     

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

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 simulation 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.     

双馈风力发电系统最大风能追踪控制

在分析风力机功率特性和DFIG运行特性的基础上,通过对双馈机转速控制进行最大风能追踪具体过程的深入研究,提出一种基于最大风能追踪的双馈电机有功、无功功率的解耦控制方法。建立了基于发电机定子磁链定向矢量控制的双馈风力发电系统最大风能追踪系统模型,并利用PSCAD／EMTDC对其进行仿真,结果验证了控制策略的正确性。     

Nonlinear model predictive control of wind turbines using LIDAR

LIDAR systems are able to provide preview information of wind disturbances at various distances in front of wind turbines. This technology paves the way for new control concepts in wind energy such as feedforward control and model predictive control. This paper compares a nonlinear model predictive controller with a baseline controller, showing the advantages of using the wind predictions in the optimization problem to reduce wind turbine extreme and fatigue loads on tower and blades as well as to limit the pitch rates. The wind information is obtained by a detailed simulation of a LIDAR system. The controller design is evaluated and tested in a simulation environment with coherent gusts and a set of turbulent wind fields using a detailed aeroelastic model of the wind turbine over the full operation region. Results show promising load reduction up to 50% for extreme gusts and 30% for lifetime fatigue loads without negative impact on overall energy production. This controller can be considered as an upper bound for other LIDAR assisted controllers that are more suited for real time applications. Copyright © 2012 John Wiley & Sons, Ltd.     

PSCAD/EMTDC-based simulation of wind power generation system

This paper proposes a novel simulation method of wind power generation system (WPGS) using PSCAD/EMTDC. The pitch control-based rotation speed control scheme of turbine under variable wind speed is implemented. For the purpose of achieving effective and user-friendly simulation method for utility interactive (grid connected) WPGS, real weather condition-based WPGS simulation (RW–WPGS) is performed using PSCAD/EMTDC. It is not easy, in general, to consider the RW conditions in the WPGS simulation using the EMTP or PSPICE type of simulators. External parameters of the RW conditions, however, are necessary to improve the simulation accuracy.The components modeling of wind turbine system is also studied and the real weather conditions are introduced by the interface method of a non-linear external parameter of the PSCAD/EMTDC. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme.     

基于改进自抗扰控制的双馈式风电机组传动系统扭振抑制策略

抑制风电机组传动系统的扭振,对于降低系统疲劳载荷、提高机组寿命具有重要意义。文章通过直接控制传动系统的扭角来抑制系统扭振,考虑非线性不确定因素,从功率的角度建立扭角数学模型。由两质量块模型得到功率和扭角的正相关关系,在此基础上,提出一种扭角参考值给定方法。采用改进的自抗扰控制策略补偿传动系统的未知扰动,将系统线性化,并通过非线性状态误差反馈将扭角给定值转化为功率给定值,进而抑制系统扭振。改进自抗扰控制参数调节简单,对扰动补偿更精确,提高了控制器的性能。仿真结果表明,所提出的抑制策略可以明显减小传动系统在阶跃风况和湍流风况下的扭振。