当前位置:主页 > 科技论文 > 电气论文 >

双馈风电场接入对送出线路继电保护的影响及改善措施

发布时间:2019-02-18 09:15
【摘要】:面对全球范围内日益严峻的化石能源枯竭和环境污染问题,风力发电作为可再生能源发电的重要代表之一,近年来得到了迅速的发展,其中双馈风力发电机以能量转换效率高,易于实现有功、无功功率解耦控制等优势,在风电场中得到了广泛的应用。我国风电多以大规模集中式并网为主,具有集群开发、弱电网接入、长距离外送的特点,风电独特的故障特性给送出线路距离保护和重合闸带来了新的问题,因此研究双馈风电场接入对送出线路继电保护的影响及改善措施,对于提高继电保护动作可靠性、增强电网抵御故障的能力、保障电网的安全稳定运行等具有重要意义。本文首先研究了双馈风力发电机的运行原理和控制策略,结合双馈风电场典型并网结构,在DIg SILENT/Power Factory中搭建了双馈风电场详细模型和等值模型,并在稳态和故障暂态下验证了模型等值的可行性。理论分析了双馈风电场的阻抗特性、弱馈特性和电流非工频特性,基于搭建的双馈风电场等值模型,仿真研究了风电场在送出线路不同类型故障下的电压、电流特性,证明了风电场故障特性理论分析的正确性。然后,结合双馈风电场的故障特性,研究了双馈风电场接入对送出线路距离保护的影响:受弱馈特性影响,当经过渡电阻故障时,距离保护测量阻抗中的附加阻抗可能使距离保护拒动或误动,风电场侧尤为严重;受零序阻抗远小于正负序阻抗的影响,接地阻抗元件比相间阻抗元件可耐受更大的过渡电阻,撬棒电阻投入会进一步降低相间阻抗元件的耐过渡电阻能力;受故障电流非工频特性影响,电压电流频率不一致会导致测量阻抗波动,可能使保护动作时间延长,当故障位于保护范围边界附近时,保护可能拒动或误动。本文提出了一种基于双侧相电流的距离保护方案和故障选相、故障类型判据,该方案不受系统非全相运行和振荡的影响,仅需通过已安装的纵联差动信道将输电线路对侧距离保护装置测得的三相电流传递到本侧即可,具有较高的实用性。最后,针对双馈风电场接入对重合闸的影响,提出重合闸方案可采用检压检同期改进配合方案或者自同期配合方案;当送出线路电压互感器没有安装或者或者因断线等故障退出运行时,本文也提出了一种重合闸时间计算方法。
[Abstract]:In the face of the increasingly severe problems of fossil energy depletion and environmental pollution in the world, wind power generation, as one of the important representatives of renewable energy generation, has been developed rapidly in recent years, among which doubly-fed wind turbines have high energy conversion efficiency. It is easy to realize active power and reactive power decoupling control and has been widely used in wind farms. The wind power in our country is mainly centralized large-scale grid connection, which has the characteristics of cluster development, weak power network access, long distance outgoing transmission. The unique fault characteristics of wind power bring new problems to the distance protection and reclosing of the transmission line. Therefore, it is of great significance to study the influence of doubly-fed wind farm access on transmission line relay protection and its improvement measures for improving the operational reliability of relay protection, enhancing the ability of power grid to resist faults, and ensuring the safe and stable operation of power network. In this paper, the operation principle and control strategy of doubly-fed wind turbine are studied at first. Combined with the typical grid-connected structure of doubly-fed wind farm, the detailed model and equivalent model of doubly-fed wind farm are built in DIg SILENT/Power Factory. The feasibility of model equivalence is verified under steady state and fault transient conditions. The impedance characteristic, weak feed characteristic and current non-power frequency characteristic of doubly-fed wind farm are analyzed theoretically. Based on the equivalent model of doubly-fed wind farm, the voltage and current characteristics of wind farm under different types of fault are simulated. It is proved that the theoretical analysis of the fault characteristics of wind farm is correct. Then, according to the fault characteristics of the doubly-fed wind farm, the influence of the doubly-fed wind farm access on the distance protection of the transmission line is studied. The additional impedance in the measurement impedance of the distance protection may cause the distance protection to refuse or malfunction, especially on the wind farm side. Because the zero sequence impedance is far less than the positive and negative sequence impedance, the earthing impedance element can withstand more transition resistance than the phase impedance element, and the input of the prying rod resistance will further reduce the transition resistance ability of the phase impedance element. Under the influence of non-power frequency characteristics of fault current, the inconsistent frequency of voltage and current will lead to measurement impedance fluctuation, which may prolong the protection operation time. When the fault is near the protection range boundary, the protection may refuse to operate or misoperate. In this paper, a distance protection scheme based on bilateral phase current and fault phase selection and fault type criterion are proposed. The scheme is not affected by the non-phase operation and oscillation of the system. The three-phase current measured by the distance protection device on the opposite side of the transmission line can only be transferred to the local side through the installed longitudinal differential channel, which is of high practicability. Finally, in view of the influence of doubly-fed wind farm access on reclosure, it is proposed that the reclosing scheme can be improved by checking and checking synchronously or self-synchronously. A reclosing time calculation method is also proposed when the output line voltage transformer is not installed or exits from operation due to breakage and so on.
【学位授予单位】:华北电力大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM614;TM77

【参考文献】

相关期刊论文 前10条

1 罗勋华;黄纯;潘志敏;刘琨;梁勇超;;基于序分量无功功率的单相自适应重合闸[J];电工技术学报;2016年11期

2 王海港;孙月琴;谢民;赵晓春;;利用过渡电阻特征的输电线路故障测距算法[J];电力系统及其自动化学报;2016年03期

3 王羽佳;李华强;黄燕;凡航;;暂态稳定视角下的最佳重合闸时间及其在线整定[J];电力自动化设备;2016年02期

4 谷松林;;基于广域保护系统的距离后备保护整定方案[J];电力系统保护与控制;2016年01期

5 李斌;李明浩;赵黎丽;王欣;;风电场接入对高压送出线路重合闸的影响[J];电力系统及其自动化学报;2015年12期

6 滕予非;行武;张宏图;史华勃;焦在滨;;风力发电系统短路故障特征分析及对保护的影响[J];电力系统保护与控制;2015年19期

7 马静;王卓;李文可;马伟;闫新;李建芳;;一种抗过渡电阻的新型自适应距离保护方案[J];电力系统自动化;2015年18期

8 耿建昭;王宾;董新洲;;利用单相跳闸后信息的输电线路单相接地单端精确测距方法[J];电工技术学报;2015年16期

9 梁睿;杨学君;薛雪;崔连华;;零序分布参数的单相接地故障精确定位研究[J];电工技术学报;2015年12期

10 裘愉涛;潘武略;倪传坤;何荷;文明浩;;风电场送出线等传变距离保护[J];电力系统保护与控制;2015年12期

相关硕士学位论文 前1条

1 文玉玲;风电场短路特性及对电网继电保护影响的研究[D];新疆大学;2009年



本文编号:2425710

资料下载
论文发表

本文链接:https://www.wllwen.com/kejilunwen/dianlidianqilunwen/2425710.html


Copyright(c)文论论文网All Rights Reserved | 网站地图 |

版权申明:资料由用户98686***提供,本站仅收录摘要或目录,作者需要删除请E-mail邮箱bigeng88@qq.com