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带有RCC的异步风力发电机系统的特性分析 总被引:2,自引:0,他引:2
介绍了带有转子电流控制器(RCC)的变桨距调节异步风力发电机系统的基本原理及其控制策略。基于Saber仿真软件,建立了变桨距风力机、绕线式异步发电饥、转子电流控制器以及风速等的仿真模型,并以此为基础深入研究了该类风力发电机系统的运行特性。仿真分析表明,引入转子电流控制可以明显改善发电机的输出电能品质,降低变桨距风力机的调节频率,延长变桨距机构的使用寿命。制作了一套7.5kW模拟异步风力发电机的RCC系统,对带有RCC的异步风力发电机系统进行了模拟实验研究。 相似文献
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对风力发电并网系统的有效风速测量问题进行研究.鉴于神经网络可应用于非线性系统的模型与辨识,不受非线性模型类的限制,且可给出工程上易于实现的学习算法,提出基于神经网络的有效风速软测量.对实时采集的风力发电机组的风速样本参数集进行分析、训练及拟合,获得相应的有效风速计算网络.仿真结果表明,有效风速软测量可代替风速仪的作用,是一种非常有效的风速估计方法. 相似文献
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提出了基于轨迹灵敏度的方法来研究水电系统参数及初始运行状态不确定性对水电系统动态安全的影响。研究建立水机电联合系统动态模型及其轨迹灵敏度模型,通过水电系统动态过程对其控制系统参数及初始运行状态的灵敏度来分析其参数及初始运行状态对整个水电系统动态过程的影响.提出对系统安全运行较大的参数及初始运行状态特点、参数的安全调整范围。 相似文献
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众所周知,风能是一种比较清洁、实用并且对环境比较友好的可替代性能源。在未来的能源战略发展中,风力能源将具备越来越重要的作用。着眼于风力发电新型能源在生产过程中的运行系统和操作方法,针对风力发电的运行系统和可控制问题进行了探讨与研究。 相似文献
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受端系统电源支撑能力关系到系统安全稳定运行,尤其是电压稳定。广东电网作为南方电网的重要受端系统,其负荷约占南方电网全部负荷的70%,远距离输送电能到广东,必须提高电源支撑能力,保障系统的安全稳定性。对南方电网的多种运行方式进行仿真,找出受端系统的薄弱环节,通过灵敏度的比较,选取灵敏度最大的点位为支撑点,分析了其支撑效果并与其他支撑点的支撑效果进行了比较。结果表明在灵敏度最高的地点进行电源支撑,支撑效果最明显;能有效提高负荷地区特别是电压弱区域的电压水平,从而提高系统的电压稳定裕度。 相似文献
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This paper analyzes the frequency dynamic behavior in a power system with a high wind power penetration. To this end, wind farms equipped with squirrel cage and doubly fed induction generators are compared. Aspects of the modeling of the different kinds of wind generation and power systems are cited. Then, it is shown, through an eigenvalue analysis, that wind farms equipped by doubly fed induction machines, adequately controlled, can contribute to improve the frequency dynamics. Simulations are presented which verify the theoretical results. 相似文献
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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. 相似文献
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In the optimization of wind turbine micro-siting of wind farms, the major target is to maximize the total energy yield. But considering from the aspect of the power grid, the sensitivity of wind power generation to varying incoming wind direction is also an essential factor. However, most existing optimization approaches on wind turbine micro-siting are focused on increasing the total power yield only. In this paper, by employing computational fluid dynamics and the virtual particle model for the simulation of turbine wake flow, a sensitivity index is proposed to quantitatively evaluate the variation of power generation under varying wind direction. Typical turbine layouts obtained by existing power optimization approaches are evaluated for stability. Results indicate that regularly arranged turbine layouts are not suitable for stable power production. Based on solutions from the power optimization, a second-stage optimization using Particle Swarm Optimization algorithm is presented. The proposed optimization method adjusts the positions of the turbines locally, aiming at increasing the stability of wind farm power generation without damaging its advantage of high power yield. Case studies on flat terrain and complex terrain both demonstrate the effectiveness of the present local adjustment optimization method. 相似文献
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太阳热风发电系统的基本原理如图1所示,由3个主要部件构成:底部为太阳能空气加热器(集热棚),中间为太阳能烟囱,烟囱底部布置风力发电机组。太阳辐射加热玻璃屋顶下温室内的空气,致使热空气源源不断流向位于温室中央的太阳能烟囱;烟囱两端空气的温差和压差导致空气沿太阳能烟囱上升产生动能,在烟囱内安装风力透平发电机,产生电能,风最后从烟囱顶部排入大气。其能量流向为太阳光能先变成空气的热能,再转变为风的动能,再转变为风力透平的动能,最后得到电能。 相似文献
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风力发电系统中的变流器模型简化方法 总被引:1,自引:0,他引:1
针对风电场仿真运行慢、占用内存大的缺点,分别对双馈异步风力发电机(DFIG)的机侧和网侧变流器进行分析。基于稳态条件下SPWM模型简化的思想,利用开关函数将DFIG中的机侧和网侧变流器模型简化为两个由直流电容相连理论模块,并将模块的输出结果输入到DFIG转子和电网电路中形成闭环。最后在PSCAD仿真平台下进行仿真,验证文中提出的简化模型的有效性。 相似文献
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