一种互联电力系统联络线功率振荡特性分析方法及应用

发布时间：2018-01-07 10:29

本文关键词：一种互联电力系统联络线功率振荡特性分析方法及应用　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着电网规模的扩大,电力系统低频振荡问题日益突出。广域测量系统在电网监测监控中的普及,使得低频振荡的监测和扰动源定位方法也实现了新的突破。广域测量系统历史数据中统计得到的电网每日发生有效扰动次数的变化能够反映系统的稳定水平的变化,而系统稳定性变化的一个重要指标是系统阻尼比的变化,因此研究并从理论上给出扰动次数和阻尼比的数学关系对分析和评估电网的稳定性具有重要意义;对一个大系统,在不同节点施加扰动,在联络线上引起的振荡幅值和波形不同,即不同节点施加扰动对联络线功率振荡的灵敏度不同。如何利用这种灵敏度信息加速扰动源的定位并且做好电网规划中负荷和监控节点的布局,本文也进行了相关研究。本文首先给出了计及功率扰动的小干扰计算公式,推导出了功率扰动下联络线振荡波动时域表达式,并研究了其幅值波动值与阻尼比的关系;基于此理论分析方法,提出了两种应用方式,即基于有效扰动次数的系统阻尼比评估方法和基于节点灵敏度的扰动源预判方法,并分别在10机39节点系统上和湖北某区域电网上验证了这些方法的有效性。该理论分析方法可以较为精确得分析扰动施加以后经过网络方程和系统动态方程的分配过程,从而替代对实际系统的时域仿真,快速得分析电力系统联络线的振荡规律。其两种应用方式可以通过观察近期WAMS记录到的有效扰动次数的变化来评估系统阻尼水平,有效预警电力系统中的低频振荡事故的发生;并可以通过对系统不同节点灵敏度的分析和排序,在电力系统发生功率振荡时,优先从节点灵敏度高的节点判定其是否为扰动源,实现扰动源定位的预判,以及在电网的规划运行中合理安排负荷布局,从而做好关键脆弱节点的监控与防范。
[Abstract]:With the expansion of power network scale, the problem of low frequency oscillation in power system is becoming more and more prominent. Wide area measurement system is widely used in power network monitoring and monitoring. The monitoring of low frequency oscillation and the method of locating the disturbance source have also achieved a new breakthrough. The change of the daily effective disturbance times of the power network obtained from the historical data of the wide area measurement system can reflect the change of the stability level of the system. Turn. One important index of system stability change is the change of system damping ratio, so it is very important to study and give the mathematical relation between the number of disturbances and damping ratio in theory for analyzing and evaluating the stability of power system. For a large system, the amplitude and waveform of oscillation caused by disturbance at different nodes on the tie line are different. That is, the sensitivity of different nodes to tie-line power oscillation is different. How to use this sensitivity information to accelerate the location of disturbance sources and to do a good job in power network planning load and monitoring node layout. In this paper, the formula of small disturbance is given, and the time-domain expression of tie-line oscillation is derived. The relationship between amplitude fluctuation and damping ratio is studied. Based on this theoretical analysis method, two kinds of application methods are proposed, that is, the damping ratio evaluation method based on the effective disturbance number and the disturbance source prediction method based on node sensitivity. The effectiveness of these methods is verified on a 10-machine 39-bus system and a regional power grid in Hubei Province, respectively. The theoretical analysis method can accurately analyze the network equation and the dynamic equation of the system after the disturbance is applied. The distribution process. In order to replace the time domain simulation of the actual system. The oscillation law of tie-line in power system is analyzed quickly. The damping level of the system can be evaluated by observing the change of effective disturbance times recorded by WAMS in the near future. Effective early warning of low-frequency oscillation accidents in power system; Through the analysis and ranking of the sensitivity of different nodes in the power system, when power oscillation occurs, priority is given to the node with high node sensitivity to determine whether the node is a disturbance source, so that the location of the disturbance source can be pre-determined. In order to monitor and prevent the key vulnerable nodes, the load layout is arranged reasonably in the planning and operation of power network.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM712

【相似文献】