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| 博康新闻 |
| 微机距离保护动态仿真系统的研究 |
| 日期：2010-05-10 |
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论文标题:微机距离保护动态仿真系统的研究
Research on Generated System for Dynamic Technology Process Based on Machine Resource and Cost Constraint
论文作者 高峰
论文导师 高厚磊,论文学位 硕士,论文专业 电力系统及其自动化
论文单位 山东大学,点击次数 29,论文页数 65页File Size18695k
2005-05-14论文免费下载 http://paper.dic123.com/lunwen_42957822/ 电力系统;距离保护;动态仿真;LabVIEW;MATLAB
Power System; Distance Protection; Dynamic Simulation; LabVIEW; MATLAB
当电力系统发生故障时,系统中的保护装置动作,将故障线路或元件切除。构成保护的原理有很多种,其中距离保护是获得广泛应用的原理之一。在距离保护的动作过程中,保护装置内部的处理过程是不可见的,内部数据是如何变化的也是无法观察的。为了分析距离保护在非故障状态下和各种故障状态下的动作行为,观察距离保护动态的变化过程,并分析各种因素对距离保护的影响,本文对微机距离保护动态仿真系统进行了深入研究。 本课题主要由三部分组成,即基于PSCAD/EMTDC的故障暂态仿真计算;基于MATLAB的暂态仿真结果数据格式转换;基于LabVIEW的距离保护动态仿真程序。 本文按照真实的微机距离保护的主要组成部分设计了距离保护动态仿真程序。该程序按照数据流的方式进行计算和处理,完全模拟了数据在保护中的流通顺序,贴近于真实的距离保护。经数据格式转换后的故障暂态计算结果作为距离保护动态仿真程序的输入量,通过对输入量进行逐点计算,能同步逐点显示出继电器的测量阻抗和其它各种仿真结果。 本文通过仿真实例从以下几个方面对距离保护进行了分析:暂态分量对距离保护的影响;应用全波傅氏算法或半波傅氏算法时对计算精度的影响;采样频率对计算精度的影响;过渡电阻的影响;过渡电阻和负荷电流共同作用引起的稳态超越;振荡对距离保护的影响。
When a fault occurs in power system, the relevant relay will operate and send out trip order to clear the faulted transmission line or other parts. The principles adapted in protection are quite a lot, of which the distance protection is one of the most widely applied principles. Generally, during the operation of a distance relay, its inner process and data conversions cannot be observed from outside. In order to analyze the detailed characteristics of distance protection in all operational conditions and observe its dynamic process, this thesis studies the digital dynamic simulation system for microcomputer based distance relay thoroughly.The studied project includes three main parts: the transient simulation calculations of faults using PSCAD/EMTDC, the format transition program for the data of the transient simulation result based on MATLAB and the dynamic simulation program of distance protection based on LabVIEW.The design of the dynamic simulation program of distance protection is accordance with the real components of computer distance relay. This program calculates and deals with data in form of data flow, almost the same to the real protection procedure. After a format transition, the transient simulation results serve as the input for the dynamic simulation program. In the process of simulation the dynamic simulation program calculates the input data point by point and displays the measured impedance and other relevant results synchronously.Some typical simulation cases, which focus on the main factors affecting distance relay"s correct operation, have been conducted in the designed simulation system. There are: the influence of transient components, the calculation precision level caused by full-cycle DFT or half-cycle DFT algorithm, the influence of differentsampling frequencies, the influence of fault resistance, the fault resistance and the load current jointly resulted steady-state over-reach and the influence of the system oscillation.The simulation results showed that this dynamic simulation system is able to not only simulate the behavior of distance protection under different operational conditions, provide with necessary evidence for the analysis of distance protection, but also be a useful software tool for the development and teaching in protective relaying area.
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