摘要
随着电力工业的迅速发展，电力系统的规模日益庞大和复杂，出现的各种故障，会给发电厂以及用户和电厂内的多种动力设备的安全带来威胁，并有可能导致电力系统事故的扩大，从技术和安全上考虑直接进行电力试验可能性很小，迫切要求运用电力仿真来解决这些问题，依据电网用电供电系统电路模型要求，因此，论文利用MATLAB的动态仿真软件Simulink搭建了单机—无穷大电力系统的仿真模型，能够满足电网可能遇到的多种故障方面运行的需要。
论文以MATLAB R2009b电力系统工具箱为平台，通过SimPowerSyetem 搭建了电力系统运行中常见的单机—无穷大系统模型，设计得到了在该系统发生各种短路接地故障并故障切除的仿真结果。
本文做的主要工作有：
（1）Simulink下单机—无穷大仿真系统的搭建 （2）系统故障仿真测试分析
通过实例说明，若将该方法应用到电力系统短路故障的诊断中，快速实现故障的自动诊断、检测，对于提高电力系统的稳定性具有十分重要的意义。
关键词 电力系统；暂态稳定；MATLAB；单机—无穷大；
Abstract
With the rapid development of power industry, the scale of power
system is increasingly large and complex, all kinds of fault, to power plants and power plants and users in a variety of power equipment safety threat, and is likely to lead to the expansion of power system accident, from the technical and safety considering direct electricity experiment was carried out on the possibility is very small, urge electric power simulation are used to solve these problems, according to the power supply system of power grid power circuit model, as a result, paper use MATLAB dynamic simulation software Simulink model for the single - infinite power system, can satisfy the needs of the running of a fault may encounter a variety of ways.
Paper R2009b with MATLAB toolbox power system as a platform,
through SimPowerSyetem set up power system in the operation of the common single - infinity system model, design the various kinds of short-circuit ground fault occurs in the system and simulation results of fault removed.
The main work is :
(1) Building this simulation system of single - infinite under Simulink (2) Fault simulation test analysis of system
Through examples, if this method to the power system fault diagnosis, fast fault detection and diagnosis, automatic for improving the stability of power system
line(三相分布传输线路)模块。
3）Machines里Synchronous Machine pu Standad（标么标准同步电机）模块，Excitation System（励磁系统）模块，Hydraulic Turbine and Governor（水轮机及调节器）模块 4）powergui 模块
（2）Simulink常用工具箱：Simulink 模块集Commonly Used Blocks （常用模块）下的 Constant（常量)模块，Bus Selector（信号总线选择器），Terminator(信号终结模块)，Scope(示波器模块)，Ground（接地模块）。
4.2运行效果仿真图
4.2．1 改变故障模块中的短路类型 （1） 单相短路接地故障
图4.21 故障 0.1s后切除线路，发电机转速变化曲线图
图4.22 故障 0.55s后切除线路，发电机转速变化曲线图
（2）两相短路接地故障
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