【作者】 张杰；

【导师】 陈中； 卢强；

【作者基本信息】 东南大学 ， 电气工程（专业学位）， 2019， 硕士

【摘要】 随着风电机组运行时间逐步增长,所暴露的问题越来越多,风电场急需对老一批风电机组进行改造和功能升级,以提升风电机组的发电效率,增强风电机组的电网适应性,建设电网友好型风电机组。本文选题源于对华能国际洮北风电场电控系统的改造。首先对风电场内机组主要存在的问题进行分析,然后针对这些问题从提升发电效率、增强电压适应性和频率适应性三方面进行研究,其次提出改造技术方法、设计仿真模型、开展仿真测试,最后进行实际改造及测试,对改造结果进行分析。在提升发电效率方面,主要对控制策略进行优化,扩大风电机组运行于叶尖速比状态下的风速范围,提出了一种自动校正最佳叶尖速比的统计平均算法,借助Bladed软件进行研究和仿真测试;硬件上设计了一种适用于不同主控制器改造的方案。在增强电压适应性方面,本文研究了基于虚拟阻抗和无功吸收的高电压穿越技术,并通过Matlab/simulink软件设计了模拟高电压发生的仿真模型并进行仿真测试,得到了良好的仿真效果;硬件上设计了斩波电路。在频率适应性方面,本文研究了虚拟同步发电机技术和一次调频的要求,基于风电虚拟同步机整场控制器设计了一次调频判断条件和控制策略,提出了一次调频方案和关键参数的参考值,设计了实现VSG的三种改造方案。之后,将改造方案应用于实际风电场改造,取得了良好的效果,实现了将华能国际洮北风电场的风电机组改造成为电网友好型风电机组的目的。更多还原

【Abstract】 As the operation time of wind turbines increases gradually,more and more problems are exposed.Wind farms urgently need to transform and upgrade the functions of old wind turbines,so as to improve the generation efficiency of wind turbines,enhance the adaptability of wind turbines to the power grid and build grid-friendly wind turbines.The topic of this thesis comes from the reform of the electric control system of Huaneng International Taobei wind farm.Firstly,the thesis analyzes the main problems existing in wind farm units,and then studies these problems from three aspects of improving power generation efficiency,enhancing voltage adaptability and frequency adaptability.Secondly,the technical methods of software and hardware modification and simulation model design are put forward for simulation test.Finally,the actual transformation and testing are carried out,and the results are analyzed..In terms of improving the power generation efficiency,the control strategy is mainly optimized to expand the wind speed range of the wind turbine operating in the blade tip speed ratio state.In this thesis,a statistical average algorithm for automatically correcting the optimal blade tip speed ratio is proposed,and the simulation model is designed by Bladed software to verify the correctness and validity of the technical method.A modification scheme for different main controllers is designed on the hardware.In terms of enhancing voltage adaptability,this thesis studies the high voltage crossing technology based on virtual impedance and reactive power absorption,and designs a simulation model to simulate the occurrence of high voltage through Matlab/simulink software as well as obtains good simulation results.The chopper circuit is designed on the hardware.In terms of frequency adaptability,this thesis studies the virtual synchronous generator technology and primary frequency modulation requirements.Based on the whole controller of wind power virtual synchronous machine,the judge condition and control strategy of primary frequency modulation are designed.The primary frequency modulation scheme and the reference value of key parameters are proposed as well as the RTDS test platform and three transformation schemes to realize VSG are designed.After that,the reconstruction scheme was applied to the actual wind farm reconstruction and good results were achieved.The purpose of transforming the wind turbines at Huaneng International Taobei wind farm into grind-friendly wind turbines was realized.更多还原