【作者】 司媛媛；

【导师】 张兴；

【作者基本信息】 合肥工业大学 ， 电力电子与电力传动， 2006， 硕士

【摘要】 近年来,风能作为一种可再生的清洁能源日益受到世界各国的广泛重视,风力发电快速发展已有将近20年的历史,其中变速恒频双馈风力发电方案己经是风力发电中的一大重点课题。 本文以变速恒频双馈风力发电模拟系统为实验平台,对系统进行监测。利用LabView的强大数据处理功能,通过合理的数据传递,实现对采集的数据进行在线处理,将数据保存为文件,通过离线调用进行历史数据回放。监测系统包括信号的采集、分析及显示。实现对系统的实时监测。 在风力发电模拟系统中,风速模拟是一个关键环节。本文分析比较了几种常用的风速分布模型:双参数Weibull分布风速模型、三参数Weibull分布风速模型、Rayleigh分布风速模型,并简单总结了各种风速模型中参数的估计方法。本文采用了组合风速数学模型,将风速分为基本风速、阵风、缓慢变化风速和噪声风速四个部分,用LV语言实现了对组合风速数学模型的仿真,证明该方法可以较好的反映自然风速情况。 本文分析了风力机运行特性及其最佳风能利用原理,理论上分别阐述了采用直流电动机、交流电动机模拟风力机特性和双馈电机共同组成的变速恒频风力发电系统在最佳功率曲线上运行的可行性。为在实验室进行变速恒频风力发电系统的研究提供了可行方案。 本文分析了双馈风力电机的工作原理,利用定子磁链定向的矢量控制方法,将同步坐标系下的双馈电机数学模型简化后得到矢量控制系统的模型,矢量控制模型与双馈电机模型一起构成闭环控制系统,并且在低于额定风速时为转速外环控制策略;在高于额定风速时为功率外环控制策略。 本文对重要的电能质量参数进行了研究。基于瞬时无功功率理论的无功谐波电流检测方法,检测有功功率、无功功率和视在功率。在电网频率的检测中,通过三点拟合方法的改进,提高其检测精度,并使该方法更适用于对畸变波形甚至于拟周期信号的频率检测,具有很强的鲁棒性。通过傅立叶同步算法获得拟周期信号的同频率标准周期信号,利用该方法获得电网的同步信号,该方法具有精度高、响应快特点。更多还原

【Abstract】 In lately years, people widely pay attention to wind energy because it is generated cleanness energy. It began development in high rate 20 years before. It is a fact that the Doubly-fed variable-speed constant-frequency (VSCF) wind generator system is a main subject in the wind electric power generator schemes.This paper is based on the Doubly-fed VSCF wind generator imitation supervisory system. Utilizing powerful LabVIEW DSP base, it deals with sampling data online and save rawdata as a file. This monitoring system has powerful expandation, the advantage of good interactivity and easy to be operated. The monitoring system realizes signal acquisition, processing and display for monitoring of power quality.Wind speed imitation is a crucial portion in the wind power generation imitation system. This paper analyzes and compares two parameters Weibull distribution 、 three parameters Weibull distribution、 Rayleigh distribution. In this paper, The proposed wind speed mathemastic model is introduced which is composed of the base wind speed model, the gust wind speed model, the ramp wind speed model and the noisy wind speed model. Based on Labview, the wind power generation imitation scheme proposed in this paper is implemented effectively and the consequence is satisfactory.The performance characteristic and the operation principle of optimum utilization of wind energy is analyzed. The feasibility of the maximum output power curved by the DC or AC motor is analyzed on theory. The hardware structure of the imitation system is proposed and the effectiveness of the system is successfully proved by the laboratory experiments.In this article the mathematical model of the Doubly-fed induction is analyzed and established. Furthermore, under the vector control strategy of stator field-orient. A vector control model will derive from the generator, which form a close control system with the generator model.The parameters of power quality are studied in the paper. Active power and reactive power are monitored based on the instantaneous reactive power theory. A improved method of 3 points curtive fitting is presented in frequency detecting, which has high accuracy in detecting distorted or varied amplitude signal. Based on the Fourier Transform, a standard sinwave is derived from the original signal, which is the synchronous signal for power.更多还原