基于DSP电力变压器微机保护系统初步设计（毕业设计）.docx

江 苏 大 学 学 士 学 位 论 文 PAGE \* MERGEFORMATI 江 苏 大 学 学 士 学 位 论 文 基于DSP的电力变压器微机保护系统初步设计 摘要 电力变压器是电力系统中的重要电气设备，它在电力系统的发电、输电、配电等各个环节广泛使用，因而其安全运行关系到整个电力系统能否连续稳定的工作。因此必须根据变压器的容量和重要程度并考虑到可能发生的各种类型的故障和不正常工作的情况，而装设性能良好、工作可靠的继电保护装置。而微机继电保护装置由于软件设计的灵活性可实现各种故障的判断，得到普遍应用。 本文在总结了变压器微机保护原理应用基础上，设计了一个基于 DSP 的变压器微机差动保护装置。首先介绍了硬件设计用到的各芯片的特性；然后具体说明了硬件的系统设计，主要分三部分：一是数据采集处理模块，二是人机接口模块，三是数据采集处理模块与人机接口模块的通信设计；其次在软件方面，讲述了各功能模块的软件设计流程，主要包括主循环程序、中断子程序以及故障处理程序；最后简单叙述了差分滤波器的设计，故障类型的判别和微机保护的算法。 关键词：变压器，差动保护，DSP，差分滤波器，傅氏算法 The Preliminary Design of Microcomputer Protection System of Power Transformer Based on DSP Abstract Power transformers are important facilities in power system. They are used in electricity generating distribution and other aspects of power system. Their safety running determines whether the whole power system can operate steadily and continuously. So high-performance and secure relay protection sets are needed for power transformers. Especially microcomputer relay protection sets, with software’s agility, find a wide application in protection of power transformers. In this paper, a microcomputer relay set for power transformer is designed under summarizing the protection theory. Firstly，the paper introduces the features of all kind of chips used in hardware design，and then specifies the system design of the hardware, it contains three parts: Firstly, Data Acquisition Processing Module, and second, Human-computer Interface Module and the third is the communication design of Data Acquisition Processing Module and Human-computer Interface Module ; secondly, on the software side, describing the process of software design of various functional modules ,mainly includes the main loop procedure, the interrupt routine and fault handling procedures; Finally briefly describes the design of the differential filter, the discrimination of fault types and the algorithms of Microcomputer Protection. Keywords: transformer, differential protection, DSP differential filter, Fourier algorithm