摘要在正常运行状态下的电力系统中，有时会发生各种短路故障导致系统不能够正常运作，电力系统必须通过相应的继电保护可靠、迅速、有选择性地切除出现的故障。而电流、电压保护其保护范围与灵敏度受系统运行方式的影响很大，在更高电压等级的电网中，为了满足有选择性切除故障的要求这时就需要用到距离保护，距离保护通过对电力系统中故障信息的提取和处理后作为依据来实现保护。因为工频故障分量只有电力系统中发生故障时才会出现，它是独立于非故障状态的，由故障本身引起的，受系统运行方式的影响很小，所以基于工频故障分量的距离保护原理有很大的优点。本文通过用电路中的叠加原理来介绍工频故障分量的概念以及其特征，主要将它应用于距离保护1段的快速主保护中，利用MATLAB中的simulink功能来分别建立工频故障分量距离保护接地短路和相间短路的仿真模型，将提取出来的工频故障分量先经过傅里叶模块滤波后，输入到S函数编程的接地和相间两种距离保护1段仿真模型的算法程序中去进行处理后，输出动作信号控制断路器是否动作，来验证了工频故障分量的距离保护原理，证明了工频故障分量距离保护可以用于快速距离保护1段的主保护中，来切除1段保护范围内的故障。74069

毕业论文关键词：工频故障分量  距离保护1段  叠加原理  傅里叶模块  MATLAB

Research of distance protection based on fault component of power frequency

Abstract In the normal operation of power system, sometimes occur all kinds of short circuit fault cause system can’t normal operation, the system must go through the corresponding power system relay protection automatically, quickly and selectively removed fault occurs。 And the protection scope and sensitivity of current, voltage protection is affected a lot by system operation mode, in the higher voltage grade of power grid, in order to meet the requirement of selective removal of the fault is needed distance protection, the distance protection in power system fault information extraction and processing for use as a basis for protection。 Because power frequency fault component only failure occurs in the power system, it is independent of the fault state caused by the fault itself, influenced by system operation mode is very small, so the distance protection based on fault component of the power frequency principle has a lot of advantages。 In this paper, by using the superposition principle in the circuit to introduce the concept of fault component and the power frequency characteristics, mainly apply it to 1 segment in the period of rapid main distance protection, Using simulation function of MATLAB to establish respectively fault component distance protection of power frequency grounding short circuit and alternate short circuit simulation model, Will extract the power frequency of fault component firstly pass the Fourier filtering module and then input into the S functional programming with grounding and alternate two kinds of distance protection after 1 segment algorithm grogram for processing to the output signal control circuit breaker action , whether to verify the distance protection principle of the power frequency of fault component, proved that the fault component distance protection of power frequency can be used for fast 1 section of main protection, distance protection to remove 1 period of protection with in the scope of the fault。

Key words: Power frequency fault component  Distance protection of 1 segment Superposition principle  Fourier module  MATLAB 

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