【作者】 吕伟；

【导师】 田立军；

【作者基本信息】 山东大学 ， 电力系统及其自动化， 2011， 硕士

【摘要】 随着科学技术的不断进步和经济的飞速发展,供电部门和用户双方对电能质量的关注度都不断升高。在所有电能质量问题引发的生产事故中,由于电压暂降而引起的事故所占比例最大。对电压暂降问题的监测与防治是现代电力系统急需解决的问题。对电压暂降的监测,最理想的办法是在电网每个节点都安装电压暂降监测装置。然而电力系统是一个庞大的系统,节点数目成千上万,在每个节点都安装电压暂降监测装置成本巨大,同时这种监测方式将产生海量的监测数据,不便于数据传输。以往国内监测点的选取多依赖一些指导性原则和工程人员的经验,没有具体地监测点优化配置方法。本文针对这个问题提出了一种利用整数线性规划对监测点进行优化配置的算法。通过对算法求得的有限监测点的监测就可以实现对全网电压暂降的监测,这样就能大大地降低电压暂降监测系统的成本及监测数据的冗余度。目前系统无功补偿器的优化配置研究已经比较成熟,许多案例已经在实际系统中得到了成功运用,本算法借鉴无功补偿优化配置的成功经验,在对凹陷域分析计算的基础上构建线性规划模型进行优化配置计算。算法克服了国外同类优化配置方法监测点覆盖范围不够全面并且监测系统只适用于单一故障类型下电压暂降的缺陷。算法利用IEEE标准测试系统针对敏感性负荷节点可观测与全网可观测两种可观性要求分别进行仿真计算,并在全网可观性要求下监测点优化配置的基础上尝试提出了一种系统暂降频次的估算方法。更多还原

【Abstract】 With the continuous improvement of the technology and the rapid development of economy the common attention of the power supply departments and the consumer are rising. Sensitive equipment can not work normally caused by voltage sags is the main reason for all of the production accidents and economic loss caused by power quality. The monitoring and control for Voltage sags has become an urgent problem for the modern power system.The best way to monitor the voltage sags is installing monitors on all of the system busbars. The power system is an enormous system, which has thousands of busbars. It will be a tremendous cost to install monitors on all of the system busbars, moreover, the huge amounts of monitoring data monitored in this way will be hard to transfer timely. There is no method for optimal monitors allocation formerly. The selection of the monitoring busbars much depends on some guiding principles and the engineering experience. Based on this problem, this paper puts forward a method of voltage sag monitoring optimization by using the linear programming model. Monitoring system will be enable to monitoring voltage sags of the whole system by monitoring the limited nodes got by this method, which provide the possibility to constructed a monitoring system with a much lower cost and a much smaller data redundancy.The research of the system reactive compensator is quite successful now, and many cases have been applied in actual system successfully. Referencing the successful experience of which the method suggested in this paper based on the analysis of exposed areas of voltage sags to optimize the monitoring stations by using the linear programming model. The algorithm overcome the defect that the monitoring range can not cover the whole system and the monitoring system is appropriate for the sole fault type only of the similar research abroad. The method proposed in this paper is tested with IEEE test systems respectively in the request of observability of the whole system and the sensitive busbars only. Byond that this paper attempted to propose a method of voltage sag frequency estimation.更多还原