共查询到20条相似文献,搜索用时 125 毫秒
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以液压型风力发电机组为研究对象,研究液压型机组低电压穿越控制问题。结合风电机组低电压穿越要求和液压型风力发电机组工作原理,提出一种比例节流阀开口度与变量马达摆角双变量联合控制的低电压穿越的控制方法。建立机组的数学模型,基于能量耗散原理和动态面控制方法构造低电压穿越双变量控制器。依托30 k VA液压型风力发电机组半物理仿真实验台进行仿真和实验研究,实现了低电压穿越过程中机组液压系统传输功率和输出转速的高精度控制,为液压型机组的低电压穿越控制的进一步研究奠定基础。 相似文献
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小型风力发电机组系统优化设计 总被引:1,自引:0,他引:1
基于小型风力发电机组整个系统,从风机的风轮,发电机,回转部分的设计,风机的调速方法,风机的控制与变流问题,风机的稳定问题等几方面探讨了如何优化设计小型风力发电机系统的方法。 相似文献
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双馈风力发电机组并网控制策略及性能分析 总被引:1,自引:0,他引:1
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。 相似文献
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通过对输入信号的加权及对前向移动预测的输出信号进行约束,获得了一种超调小,过渡过程快的预测控制器。在水轮机调速控制中的仿真研究验证了该方法的有效性。 相似文献
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李安乐 《电网与水力发电进展》2009,25(5):50-54
水轮机调速器是控制水轮机输出机械功率的关键设备.是水轮发电机组控制的重要内容。针对非线性复杂时变水轮机调速器.研究了一种模糊小脑模型关节控制器,该智能控制器是一种模糊逻辑与小脑模型关节控制器的结合,集中了二者的优点和长处。分析了该控制器的结构、具体实现以及学习优化。仿真实验表明该智能控制器的实际效果良好。 相似文献
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汽轮机液压调节系统与数字电液控制系统的分析比较 总被引:3,自引:0,他引:3
从工作原理、主要功能、静态和动态特性几个方面对汽轮机液压调节系统和数字电液控制系统进行了分析比较,说明了数字电液控制系统具有调节速度快、精度高,可在线修改速度变动率、可实现汽轮机自启停控制和阀门管理等特点。 相似文献
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A complete mathematical model of a hydraulic transmission concept for use in wind turbines is presented. The hydraulic system transfers the power from the nacelle to ground level. The main focus has been to develop a model that takes into account the most important dynamics affecting the wind turbine and the hydraulic transmission system involved, such that the model can be used to analyze the dynamic feasibility of a hydraulic transmission concept. Further, dynamic analysis of a hydraulic transmission system for wind turbines is investigated. The nonlinear dynamic model is developed in MATLAB Simulink. Analytical calculation of natural periods of a linearized model corresponds well with simulations of the overall system. A valve control system is proposed to reduce pressure and power fluctuations at operation both below and above the rated wind speed for the wind turbine. Further, a blade pitch control system based on an aerodynamic power estimator is proposed for operation above the rated wind speed. System simulations for one case below and one case above the rated wind speed show that the dynamic response of the overall system is stable and that the wind turbine variables are within typical ranges for conventional variable speed wind turbines with mechanical transmission. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Carl R. Shapiro Pieter Bauweraerts Johan Meyers Charles Meneveau Dennice F. Gayme 《风能》2017,20(7):1261-1275
In this study, we propose the use of model‐based receding horizon control to enable a wind farm to provide secondary frequency regulation for a power grid. The controller is built by first proposing a time‐varying one‐dimensional wake model, which is validated against large eddy simulations of a wind farm at startup. This wake model is then used as a plant model for a closed‐loop receding horizon controller that uses wind speed measurements at each turbine as feedback. The control method is tested in large eddy simulations with actuator disk wind turbine models representing an 84‐turbine wind farm that aims to track sample frequency regulation reference signals spanning 40 min time intervals. This type of control generally requires wind turbines to reduce their power set points or curtail wind power output (derate the power output) by the same amount as the maximum upward variation in power level required by the reference signal. However, our control approach provides good tracking performance in the test system considered with only a 4% derate for a regulation signal with an 8% maximum upward variation. This performance improvement has the potential to reduce the opportunity cost associated with lost revenue in the bulk power market that is typically associated with providing frequency regulation services. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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水轮发电机组的直接自适应模糊控制 总被引:3,自引:0,他引:3
提出了一种新颖的直接自适应模糊控制方法。基于筒化了的T-S(Takagi-Sugeno)模糊推理规则,采用神经网络权值的联想式学习修正方法,对T-S模糊推理规则进行在线修正,给出了盯应的神经网络实现结构,从而实现了不需要建立受控对象模型的直接自适应模糊控制。对一混流式水轮机组的仿真控制实验结果证明了所提出方法具有设计简单、鲁棒性强的优点,能适应水轮机组在不同工况下的控制要求。 相似文献