基于毕业论文 虚拟仪器技术的风力发电并网电能质量监测系统.doc

摘 要 面对日益严峻的能源形势，化工燃料日益枯竭，全球范围的能源困局，迫使世界各国不得不讨论后续能源的接续问题。风力发电因投资小、清洁无污染、资源分布广而受到人们的广泛关注。但由于风资源的不确定性和风电机组本身的运行特性使风电机组的输出电量是波动的，当风电机组并网运行时，会影响电网的电能质量，如电压偏差、电压波动和闪变、谐波等 ，严重时会对弱电网的安全稳定性造成危害，因此风力发电场对接入电网的影响不容忽视。 因此，本论文提出并设计了基于当今测量领域的最新技术——虚拟仪器技术为平台的电能质量参数监测系统，系统能够对电压、电流、频率、三相电压不平衡度、电网谐波、电压波动和闪变等电力参数实时地监测，并且具有实时的分析功能。 关键词: 电能质量，风力发电，LabVIEW Abstract Facing with increasingly serious energy situation, chemical fuels are depleted, the global energy predicament, forcing countries around the world have to discuss the follow up the issue of energy. Wind power generation due to less investment, Clean pollution-free, wide distribution of resources and was put attention by people. However, due to the uncertainty of the wind resource and Their own wind turbine operating characteristics make the output of wind turbine power is fluctuating, when the wind turbine operate connect grid, it will affect the power quality, such as voltage deviation, voltage fluctuations and Flicker, harmonics, etc, security and stability of the weak power grid would cause harm, so wind power on accessing power grid can’t be ignored. So this paper put forward and design the power quality parameters monitoring system based the newest technology of the field of measurement and control now-the virtual instrument technical, it can monitor electric power parameter including voltage, electrical current, phase, frequency, three-phase voltage unbalance, harmonic and the voltage fluctuation and flicker, and can also provide the detailed power quality monitoring analysis and results in real time. Key words: Power quality，Wind power generation，LabVIEW  目 录 第一章 绪 论 1 1.1世界能源的现状 1 1.2风力发电的发展 1 1.2.1国外风力发电的发展 1 1.2.2中国风力发电的发展 2 1.3风力发电中的电能质量基本问题 3 1.3.1电能质量的概念 3 1.3.2风力发电并网对电能质量的影响 4 1.4本论文的主要工作 4 第二章 电能质量指标的国家标准及相关算法 5 2.1基本参数的计算 5 2.2供电电压允许偏差 6 2.3电力系统频率允许偏差 7 2.4三相电压允许不平衡度 8 2.5电网谐波分析 9 2.5.1谐波的含义 10 2.5.2谐波产生的原因和影响 10 2.6电压波动和闪变 11 第三章 虚拟仪器技术概述 13 3.1虚拟仪器的概念 13 3.2虚拟仪器的构成 13 3.3虚拟仪器与传统仪器比较 14 第四章 系统硬件设计 15 4.1系统