摘 要
电力系统中很多电压崩溃事故往往是由一些故障引起的,切负荷是使故障后的系统恢复电压稳定的有效方法。本文对故障切负荷的策略作了一些研究,提出了一种切负荷的方法。为了更准确地描述电力系统在非正常运行情况的状态,本文提出了一种新型的潮流算法,它同时考虑了系统的网络方程和动态元件的稳态特性,使计算结果更接近系统实际运行状态。另外还设计了基于延拓法的连续潮流算法,用于求取系统的稳定极限,和计算节点的电压稳定灵敏度。在此基础上,本文提出了选取切负荷地点和确定最小切负荷量的方法。
关键词:电力系统 电压稳定 电压崩溃 连续潮流 切负荷。
Abstract
In power system, many voltage collapse incidents are caused by some fault, load shedding is a efficient way to restore the stability of a system after fault. In this paper we make some study on load shedding strategy after fault and a load shedding method is presented. In order to describe the state of a power system under abnormal operation condition more accurately, a novel load flow algorithm is developed in which both network equation and the steady characteristic of dynamic elements in power systems are considered. Also we developed a continue-power-flow (CPF) program based on the method which is used to calculate the stability limit of a power system and the voltage stability sensitivity of a special bus. Based on the above, a method used to select the location and determine the amount of a load shedding strategy is presented.
Keywords: Power system Voltage stability Voltage collapse Continue power flow Load shedding.