继电保护用开源电源的设计

继电保护用开源电源的设计

文档编号:DQ127 文档字数:14940,页数:30

摘要
继电保护装置对电力系统的安全可靠运行有着十分重要的作用，而继电保护用开关电源是继电保护装置中的主要功能模块，电源性能的好坏直接影响到继电保护装置可靠性。由蓄电池组构成的高频开关直流电源因其高可靠性成为电力操作电源系统中的重要组成部分。本文分析了国内外高频开关电源的发展和现状，研究了开关电源的基本原理以及开关电源在电力直流操作电源系中的应用，设计出一种实用于继电保护的开关电源。本文设计的开关整流模块还具有多种保护措施，如过压、过流等，该电源主电路采用反激式电路，应用反馈手段和脉冲调制技术实现多路电压的稳定输出。由于开关电源用继电保护的特殊要求，故系统具有体积小、重量轻、可靠性高等一系列优点。
关键词开关电源；继电保护；反激式电路

Abstract
Protective relay play the important part in the safety of power system, and switching power supply for relay protection is the mail functional modules for protective relay, power performance to a direct impact on the reliability of relay protection devices. In the power plant and transformer substations, the DC operation power is supplied from high frequency switching power supply (HF SPS) and uses bulky batteries as alternative power. The paper analyze the present situation development of high frequency switching power supply domestically and overseas, study and research the basal principle of HF SPS and its application in electric power system, then design HF SPS applied in electric power system. System exceptions, such as over-voltage, over-current, etc, are dealt with by carefully designed protection circuits. The reverse excitation circuit is applied for the power circuit. We get static outputs by using the methods of feedback and pulse-width modulation. Because the switching power supply for relay protection system, the switching mode power supply has many advantages: light weight, small physical size, high reliability, etc.
Key word switching power supply；relay protection； reverse excitation circuit

摘要…………………………………………………………………………………………………Ⅰ
Abstract………………………………………………………………………………………………II
1 绪论…………………………………………………………………………………………………1
1.1 研究背景……………………………………………………………………………………1
1.2 课程的意义…………………………………………………………………………………2
1.3 本文的主要内容和工作……………………………………………………………………3
2 开关电源的工作原理……………………………………………………………………………4
2.1 继电保护用开关电源的特殊要求…………………………………………………………4
2.2 开关电源的基本原理………………………………………………………………………4
2.3 开关变换器…………………………………………………………………………………7
2.4 控制电路……………………………………………………………………………………10
3 开关电源主电路的设计………………………………………………………………………12
3.1 开关电源电路设计分析……………………………………………………………………12
3.2 主电路输入级电路设计……………………………………………………………………13
3.3 变压器的设计………………………………………………………………………………15
4 开关电源控制电路的设计……………………………………………………………………19
4.1 PWM控制器…………………………………………………………………………………19
4.2 输出过欠压保护……………………………………………………………………………22
4.3 5V与24V时序配合…………………………………………………………………………22
5 总结………………………………………………………………………………………………25
致谢……………………………………………………………………………………………………26
参考文献………………………………………………………………………………………………27

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