共查询到19条相似文献,搜索用时 78 毫秒
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本文主要研究兆瓦级风电机组变桨距控制系统的控制策略,基于不完全微分PID控制算法开发控制器,通过建立数学模型,与传统的PI控制器进行比较提出了优化的变桨距控制策略。通过实际工程应用中常用的CodeSys编程软件运行实际风电机组程序并进行全风速仿真,对比优化后的控制算法具有超调小,控制精度高及输出桨距角平滑等优点,为变桨距控制系统策略的优化提供设计思路及方案。 相似文献
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为了改善变速恒频风力发电系统在恒功率输出运行区域内的动态性能,在分析系统变桨距控制研究现状的基础上,基于RBF神经网络(RBFNN)整定PID控制理论设计风力发电系统变桨距控制器,建立了风力机及变桨距机构模型,以发电机转速测量值与额定转速相比后误差为输入设计控制器。在随机风作用下对设计的RBFNN整定PID控制器进行仿真,结果表明基于RBFNN整定PID控制理论的变桨距控制器具有良好的动态性能及对风速扰动的鲁捧性,能够有效改善风力发电系统变桨距控制效果。 相似文献
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依据风电机组的变桨距控制原理和风电机组的运行特性,建立了转速环和功率环控制的风电机组变桨距控制系统,结合双馈风电机组各部分数学模型,在PSCAD/EMTDC中搭建了风电机组的并网仿真模型。对不同风速段湍流风况条件下的风电机组并网运行特性进行仿真,实现了不同运行阶段下风电机组运行特性的优化控制,并在此基础上分别仿真了阵风干扰和电网故障扰动下风电机组的动态运行特性。仿真结果分析表明,双环变桨距控制系统可以较好地优化风电机组的功率输出特性,在电网发生故障时桨距角的快速动作也可以有效地抑制故障暂态响应的进一步恶化,有利于电网的迅速恢复。 相似文献
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建立变桨执行机构的三维实体模型,根据其运行原理模拟出其运动状态并分析其运动性能。基于风力机组的工作条件及变桨控制原理,搭建SIMULINK变桨控制系统模型,并结合UG运动协同仿真模块完成其控制系统的联合仿真和数据分析。相关的试验数据表明:该变桨执行机构在控制系统的控制下运动性能稳定且反应迅速,达到在变风速下稳定吸收风能的目的,能有效满足使用要求,为其进一步设计和控制优化奠定基础,同时提供了一种模拟机构工作运行性能的方法。 相似文献
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Clemens Jauch Syed M. Islam Poul Srensen Birgitte Bak Jensen 《Renewable Energy》2007,32(14):2334-2349
The design of a PID pitch angle controller for a fixed speed active-stall wind turbine, using the root locus method is described in this paper. The purpose of this controller is to enable an active-stall wind turbine to perform power system stabilisation. For the purpose of controller design, the transfer function of the wind turbine is derived from the wind turbine's step response. The performance of this controller is tested by simulation, where the wind turbine model with its pitch angle controller is connected to a power system model. The power system model employed here is a realistic model of the North European power system. A short circuit fault on a busbar close to the wind turbine generator is simulated, and the dynamic responses of the system with and without the power system stabilisation of the wind turbines are presented. Simulations show that in most operating points the pitch controller can effectively contribute to power system stabilisation. 相似文献
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The reduction of structural loads is becoming an important objective for the wind turbine control system due to the ever‐increasing specifications/demands on wind turbine rated power and related growth of turbine dimensions. Among various control algorithms that have been researched in recent years, the individual pitch control has demonstrated its effectiveness in wind turbine load reduction. Since the individual pitch control, like other load reduction algorithms, requires higher levels of actuator activity, one must take actuator constraints into account when designing the controller. This paper presents a method for the inclusion of such constraints into a predictive wind turbine controller. It is shown that the direct inclusion of constraints would result in a control problem that is nonconvex and difficult to solve. Therefore, a modification of the constraints is proposed that ensures the convexity of the control problem. Simulation results show that the developed predictive control algorithm achieves individual pitch control objectives while satisfying all imposed constraints. 相似文献
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为限制大型风力发电机组在高风速时的功率输出和风力机气动载荷,首先,采用PID控制,设计独立变桨距功率和扭矩外环控制;其次,引入不依赖于系统数学模型的无模型控制,设计桨叶挥舞弯矩内环控制;最后,以外环控制输出桨距角为参考量,内环无模型控制期望桨距角为反馈量,利用PID控制,给出3个桨叶桨距角最终参考值。利用Matlab/Simulink仿真软件,搭建了3 MW风电机组仿真平台,仿真结果表明,所设计的独立变桨距多目标控制,能够完成在高风速时保持风力机组输出功率恒定、平衡3个桨叶所受扭矩以及兼顾3个桨叶所受挥舞弯矩的多目标控制任务。 相似文献
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As the size of wind turbines increases, the load alleviating capabilities of the turbine controller are becoming increasingly important. Load alleviating control schemes have traditionally been based on feedback from load sensor; however, recent developments of measurement technologies have enabled control on the basis of preview measurements of the inflow acquired using, e.g., light detection and ranging. The potential of alleviating load variations that are caused by mean wind speed changes through feed‐forward control have been demonstrated through both experiments and simulations in several studies, whereas the potential of preview control for alleviating the load variations caused by azimuth dependent inflow variations is less described. Individual or cyclic pitch is required to alleviate azimuth dependent load variations and is traditionally applied through feedback control of the blade root loads. In many existing studies, the performance of an advanced controller is compared with the performance of a simpler controller. In this study, the effect of three measurement types on the load alleviating performance of the same cyclic pitch control design is studied. By using a baseline cyclic pitch controller as test bench, the effect of the different measurement types on the controller performance can be assessed independent of control design. The three measurement types that are considered in this study are as follows: blade root out‐of‐plane bending moment, on‐blade measurements of angle of attack and relative velocity at a radial position of the blades, and upstream inflow measurements from a spinner mounted light detection and ranging (LiDAR) sensor that enables preview of the incoming flow field. The results show that for stationary inflow conditions, the three different measurement types yield similar load reductions, but for varying inflow conditions, the LiDAR sensor‐based controller yields larger load reductions than the two others. The results also show that the performance of the LiDAR sensor‐based controller is very sensitive to uncertainties relating to the inflow estimation. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献