-
摘要大型风电基地处于电网末端，电网网架结构较为薄弱，电源结构单一，若将大型风电基地并入电网，则会对电网的稳定运行带来较大压力。近年来，随着政策和技术的支持，风电容量不断增大，但电网建设速度远远落后于风电容量增大的速度，而且风电易受气候和天气的影响，其随机性和波动性也使得风电并网受到了进一步的限制。电力电子技术的发展，为直流输电技术的应用提供了有利条件，基于电压源型换流器的柔性直流输电(VSC-HVDC)技术在远距离输电、联络交流系统有着广泛的应用，这是一种基于电压源型换流技术的高压直流输电技术，传统的直流输电技术采用半控型半导体材料晶闸管的电流源换流器，而柔性直流输电则主要采用全控型半导体材料绝缘栅双极晶体管(Insulated-Gate Bipolar Transistor-IGBT)的电压源换流器，具有关断电流的能力。较之传统的直流输电方式，柔性直流输电具有其独特的优势，例如运行控制方式灵活多变，连接分散电源等，所以，对于大型风电场并网而言，柔性直流输电（VSC-HVDC）技术可以克服并网过程中的很多问题，本文就使用仿真软件 Matlab 对风电场机侧、网侧及柔性直流输电系统分别进行了模拟仿真。 31789
- 上一篇：matlab基于多摄像机的钢板几何尺寸测量系统设计
- 下一篇：基于FPGA的FLASH接口的设计与实现
毕业论文关键词 风力发电 柔性直流发电 系统仿真 风电场聚合建模
Title The simulation of large wind farm’s VSC-HVDC system based on PSCAD/MATLAB
Abstract Large-scale wind power base is in the end of grid. The power grid structure is weak. The power architecture is single. If large-scale wind power base Incorporated into the grid，it will bring great pressure for the stable operation of the grid. In recent years, with the support of policies and technologies, wind power capacity is increasing. However, the speed of network construction is far behind the speed of the wind power capacity increases. And wind power affected by climate and weather. Its randomness and volatility also makes wind power has been further restrictions. Development of power electronics technology for the application of DC transmission technology have provided favorable conditions. HVDC technology based on flexible voltage source converter in long-distance transmission, contact AC system has a wide range of applications. It is based on voltage source converter technology HVDC technology. HVDC technology uses conventional semi-controlled thyristor semiconductor material current source converter, and VSC-HVDC is mainly used full-controlled type semiconductor material insulated gate bipolar transistor voltage source converter. IGBT has capability of Shutdown current. VSC-HVDC has its unique advantages, such as running control flexible, decentralized power supply connection. For the large-scale wind power base Incorporated into the grid, VSC-HVDC technology can overcome a lot of problems. In this paper, the wind farm machine side, the network side and the VSC- HVDC system was simulated.
Keywords Wind Power VSC- HVDC System Simulation Wind Farm Aggregated Modelling
目录
1绪论1
1.1课题背景1
1.2直流输电系统简介2
1.3VSC-HVDC技术的特点和应用..3
1.4本文主要工作4
2风电场聚合模型.6
2.1聚合模型介绍.6
2.2风力发电机侧建模7
2.3电网侧建模24
3柔性直流输电系统30
3.1基本原理30
3.2柔性直流输电控制系统31
3.4仿真结果36
4对柔性直流输电在风电的应用与展望..39
4.1风力发电并网技术现状39
4.2柔性直流输电在风电并网中的应用.39
结论42
致谢43
参考文献44
1 绪论 能源是人类物质生活和社会文明发展的重要动力，对能源利用的认识和发展始终伴随着人类文明的进步，人类历经了薪柴、煤炭和油气时代，每一次的时代更替，都成为当时社会生产力大力发展的主要动力，极大推动了当时社会发展【1】 。 随着对化石能源的大力开发，工业迅速取代农业和手工业，成为人类文明社会发展的新引擎，经过多年发展，社会生产力达到了空前发达的程度。但与此同时，随着人们对能源的需求越来越大，世界范围内也出现了能源短缺，温室效应，环境污染等问题，而三大支柱能源不久即将耗尽。为了解决这些问题，寻找新型可再生清洁能源，成为一个世界性的课题，尤其在二十世纪八十年代后，太阳能、风能、核能等新能源的利用得到了广泛的关注。 风力发电是新能源利用的主流方向之一，但由于风力发电易受天气、季节、地理、负荷等外界因素影响，稳定性较差，所以在并网供电方面难度较大。