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内容：毕业论文+完整Matlab Simulink仿真

摘 要

随着电力工业的发展，大型发电机组在电力系统中的地位越来越重要，大机组的故障或突然切除，会给电力系统带来很大影响。

发电机失磁故障是一种严重的故障形式，失磁保护也是发电机保护的重点和难点。目前失磁保护误动、拒动的情况时有发生，为了对保护判据进行合理改进，就要深入研究失磁的动态过程。在全面理解大型发电机保护原理的基础上，本文重点对低励失磁保护进行了研究。使用Matlab对失磁故障进行仿真，总结了失磁故障的特征。

本文介绍了国内现有的典型失磁保护，分析了现有保护存在的一些问题。详细分析按异步边界整定的原理和按静稳边界整定的原理并通过比较分析采用了按照异步边界阻抗整定的原理来给发电机模型加设保护。文中还介绍了失磁保护的构成、出口逻辑以及配置方案。对于不同原理的发电机失磁保护误动进行了分析并提出了改进措施。

本文通过使用Matlab的Simulink中的电力系统仿真模块，考虑输电线路、水轮机的转速调节系统以及自动励磁调节装置的影响建立了包括发电机、变压器、连接线路、无穷大系统在内的发电机组一系统仿真模型，针对励磁绕组完全失磁、部分失磁两种失磁情况，按照输出有功功率以及发电机型号的不同，对其进行了仿真，分析了失磁故障后的动态过程，通过对比仿真波形，对各电气量变化规律进行了理论分析。

关键词：  发电机, 失磁保护, MATLAB, 仿真

Abstract

With the development of power industry and the capacity of single generator grows，the large generator-transformer units play more important roles in power system, and the demands for higher performance of large generator protection is necessary.

For synchronous generator，loss of excitation is a serious fault and the corresponding protection often refuse to operate. It's important for us to analyze the dynamic excitation-loss process precisely. In this paper, by use of the selected blocks from Power System Library in Matlab, the author sets up a generator-infinite system and simulates the loss of excitation fault.

It introduces the domestic existing partial or total loss of excitation protection criterion, analyzed the problem of existing criterion. The multi analysis used according to the asynchronous boundary setting calculation principle and according to the static stability boundary setting calculation principle and through the comparison analysis provide generator model generator protection according to the asynchronous boundary impedance setting calculation principle. This paper also introduced the constitution loss of excitation protection，the exportation logic as well as the disposition plan. Lost the excitation protection regarding the different principle generator by mistake moves carries on analyzes and proposes the improvement measure.

By using the Simulink power system Simulation module of Matlab, considers the influence of transmission line, hydraulic turbine rotational speed adjustment as well as automatic excitation control system establishes simulation model includes generator，transformer, connects line，infinity system .In view of partial or total loss of excitation，the magnetism situation，according to the difference of output active power as well as the generator mark，carried on the simulation to it, and analyzed partial or total loss of excitation, the dynamic process, carried on the theory analysis through contrast the change of various electrical quantity.

Key Words:  generator, loss-of-excitation protection, MATLAB, Simulation

2008-9-15 23:44 上传

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