用于三相异步电动机变频调速的PWM型逆变器谐波消除方法的仿真研究

通过对ＰＷＭ型逆变器输出波形的分析,利用微机进行仿真计算,求出合适的触发角系列,从而消除三相异步电动机变频调速系统中逆变器产生的有害谐波。     

基于SVPWM的双馈风力发电系统仿真

在RTDS环境下构建基于SVPWM（空间矢量脉宽调制）的双馈型异步发电机及控制系统的仿真模型．其控制回路中所包含的矢量控制能够跟踪最大风能,从而获取最大能量。仿真1个容量为1．5MW双馈风力发电系统．发电机功率因数和直流电压具有可控性,发电机输出有功功率、无功功率能够解耦控制,试验结果验证了系统的控制特性良好。     

小型孤立风力发电系统变流器设计与仿真

针对小型孤立风力发电系统输出电压和频率易波动特点,采用空间矢量脉宽调制技术(Space Vector Pulse Width Modulation,简称SVPWM),设计了小功率变流器控制电路.在Matlab/Simulink环境下建立了适用于风力发电系统的整流器与逆变器的模型,并进行了仿真.仿真结果表明,基于SVPW...     

基于RTDS的恒速型风力发电系统并网模型的建立及仿真分析

介绍了大型恒速型风力发电系统的结构及工作原理,通过分析恒速型机组的风力机模型、桨距角控制模型、无功补偿装置模型及风速模型的机理,建立了机组的RTDS仿真模型,对机组全系统动态机理模型进行实时数字仿真,在机组各种工况条件下分析恒速型风力发电系统的并网动态特性,经试验验证,该模型可以很好地表现风电场电磁暂态特性。     

基于开关变压器的高压异步电动机软启动的仿真研究

分析了基于开关变压器的高压异步电动机软启动器的工作原理,建立了软启动仿真的动态数学模型。详细分析了电动机软启动的各种工作状态,提出采用对称分量法求解状态方程中的输入电压。提出了软启动的控制方法,通过实例进行了仿真。仿真结果和实验结果吻合较好,证明给出的仿真方法是正确有效的。     

基于鼠笼异步发电机风力发电控制系统的研究

描述了基于鼠笼电机的风力发电系统,介绍了该系统的控制策略和方法.通过机侧变流器控制电机转速以完成各阶段风力发电的电机控制,通过网侧变流器保持直流母线电压稳定并调节无功输出.研究得出了基于鼠笼电机风力发电系统的控制策略,并通过仿真和实验验证其可行性,结果表明该控制策略可使系统正常运行,保证了基于鼠笼电机的风力发电系统可为...     

基于MATLAB环境下交流电动机矢量控制变频调速系统的仿真

介绍了基于MATLAB环境下 ,应用Simulink中的电力仿真工具 ,对交流电动机矢量控制变频调速系统进行仿真的方法 ,并结合具体实例 ,在Simulink中给出仿真结构图和仿真实验结果。     

异步风力发电系统建模与仿真

根据风电机组在风电场中的位置的不同,建立反映不同风速变化的异步发电机风电场模型,将风电场接入简化的电力系统模型,对风电场风速变化时风力机的稳态运行以及部分机组出口发生相间短路故障的机组运行情况进行了仿真.仿真结果表明,异步风力发电机向系统发出有功的同时,需要从系统吸收一定的无功功率,适当的无功补偿有利于提高电压水平和风...     

带增益调度的风力发电变桨足巨控制研究

介绍了风力发电变桨控制的基本原理,对以输出功率作为控制量的变桨控制方法进行了仿真,并引入了一种带增益调度的变桨控制策略,通过仿真验证对比,证明了这种带增益调度的控制策略可以改善变桨控制效果。     

带增益调度的风力发电变桨距控制研究

介绍了风力发电变桨控制的基本原理,对以输出功率作为控制量的变桨控制方法进行了仿真,并引入了一种带增益调度的变浆控制策略,通过仿真验证对比,证明了这种带增益调度的控制策略可以改善变桨控制效果。     

风力发电机的发展现状

对国内外风力发电机的发展现状进行了概述.重点介绍了目前风电场中所采用的风力发电机组,包括风力机、风力机的功率调节及恒速恒频和变速恒频发电系统.指出了风力发电机的发展趋势和研究方向.     

风电场并网引起的电压波动仿真

以异步风力发电机为研究对象,分析了其各个组成部分的数学模型。利用电力系统分析软件包PSS／E的IPLAN程序构建了其仿真系统模型,模拟了风电机组在阵风影响下系统电压的波动。     

借鉴国外经验 加快开发风力发电

通过对欧州4国的考察,进一步了解了当前世界风力发电的情况。介绍了风力发电的优越性、考察后的体会,指出了加快吉林省风力发电的作法。     

Several Factors Affecting the Inspection of Wind Turbines by UAV

The country strongly supports the development of new energy industries, with the clean energy wind power industry developing rapidly and the market maturing, the scale of wind farms and installed capacity expanding, and the blade length increasing to 60-70m. The increased blade length and weight increase the probability of damage. the manual inspection method is time-consuming and laborious, with a high economic cost, low inspection efficiency, and high safety risks, and cannot meet the current wind turbine fast and efficient inspection requirements. This paper intro-duces the characteristics of the type of UAV, its working status, and mode, and proposes how to determine the best area for UAV inspection according to the factors that can cause interference to the inspection in the actual wind field, to achieve the demand for fast and efficient inspection of the blade surface and improve the accuracy of inspection. It is believed that with the development of UAV technology, UAVs will play a more important role in the field of in-spection.     

基于组件式架构的风力发电机组仿真软件的设计与实现

本文主要研究了风力发电机组仿真软件的设计与实现,以数学模型代替实际电力系统,采用组件式架构,提供图形化组态的方法来进行仿真模型的构建,实现对风力发电系统运行的试验和研究。     

Research on Surface Defect Detection Technology of Wind Turbine Blade Based on UAV Image

In the background of “double carbon,” vigorously developing new energy is particularly important. Wind power is an important clean energy source. In the field of new energy, wind power scale is also expanding. With the wind turbine, the probability of large-scale blade damage is also increasing. Because the large wind turbine blade crack detection cost is high and because of the poor working environment, this paper proposes a wind turbine blade surface defect detection method based on UAV acquisition images and digital image processing. The application of weighted averages to achieve grayscale processing, followed by median filtering to achieve image noise reduction, and an improved histogram equalization algorithm is proposed and used for the characteristics of the UAV acquisition images, which enhances the image by limiting the contrast adaptive histogram equalization algorithm to make the details at the target area and defects more clear and complete, and improves the detection efficiency. The detection of the blade surface is achieved by separating and extracting the feature information from the defects through image foreground segmentation, threshold processing, and framing by the connected domain. The validity and accuracy of the proposed method in leaf detection were verified by experiments.     

PSS/E环境下的第二代风机模型解析与低电压穿越功能优化增强

PSS/E作为广泛应用且功能强大的电力系统专业仿真分析软件,在模型仿真研究中具有巨大优势。但PSS/E的暂态模型在对风电机组的低电压穿越描述中存在缺陷,致使PSS/E环境下的风电建模仿真无法进行有效深入的并网研究,对于电网规划建设及运行控制各个环节,均降低了实际参考指导意义。通过全面解析PSS/E第2代风机模型的构建机理,阐述其在风机低电压工况描述上的优势与不足,并应用PSS/E强大的暂态模型自定义功能对其低穿特性进行功能补充优化。该工作填补了基于PSS/E第2代风机模型进行功能扩展上的研究空白,丰富了PSS/E暂态模型库,赋予该软件平台进行大规模可再生能源并网发电暂态分析的核心功能。结合风机实际电压跌落故障下的输出特性,通过仿真对比验证了该模块的准确性与实用性。     

Floating Wind Turbine Motion Suppression Using an Active Wave Energy Converter

This paper proposes a new concept of an actively-controlled wave energy converter for suppressing the pitch and roll motions of floating offshore wind turbines. The wave energy converter consists of several floating bodies that receive the wave energy, actuators that convert the wave energy into electrical energy and generate the mechanical forces, and rigid bars that connect the floating bodies and the wind turbine platform and deliver the actuator forces to the platform. The rotational torques that are required to minimize the platform pitch and roll motions are determined using a linear quadratic regulator. The torques determined in this manner are realized through the actuator forces that maximize the wave power capture as well. The performance of the proposed wave energy converter in simultaneously suppressing the platform pitch and roll motions and extracting the wave energy is validated through simulations.