智能组合线性电阻灭磁装置的研究  

Research of Intelligent De-excitation Device with Linear Resistor Combination

作　　者：李志军[1] 李淼[1] 刘汉征 秦晓雪[1] 

机构地区：[1]河北工业大学控制科学与工程学院,天津300130

出　　处：《华北电力大学学报（自然科学版）》2015年第5期57-61,共5页Journal of North China Electric Power University：Natural Science Edition

摘　　要：针对现有灭磁装置的缺陷,提出了一种同步发电机线性电阻组合灭磁装置,利用计算机智能技术,根据机组实际工况和灭磁过程中励磁电流的大小,适时驱动可关断晶闸管GTO使得二级线性电阻介入,进而达到快速灭磁的目的。建立了灭磁过程的数学模型,以三峡700 MW水轮发电机组为对象,利用MATLAB的SIMULINK工具,对传统灭磁过程和智能灭磁过程中的励磁电压、励磁电流的变化曲线和灭磁时间进行了仿真和结果比对。仿真结果表明,该方法克服了现有发电机灭磁电路技术中存在的灭磁回路复杂,构成原件昂贵的缺陷,在快速性、安全性和可靠性上具有明显的优势。Because of the defects of existing de-excitation devices,this paper presents a synchronous generator de-excitation device with linear resistor combination.By using computer intelligent technology,this device can detect excitation current in the process of de-excitation and find the best time to drive the GTO intervening the secondary resistance,and then achieve the goal of quick de-excitation.In addition,mathematical model of the process of de-excitation is established.Curves of the excitation current,voltage and de-excitation time of several traditional de-excitation methods and intelligent de-excitation method are compared based on the parameters of The Three Gorges＇ 700 MW hydroelectric generating set by using the SIMULINK tool.Finally,this method overcomes the disadvantages of complex and expensive components of generator de-excitation circuit technology.Therefore,the results verified the rapidity,security and reliability of the intelligent de-excitation device.

关 键 词：同步发电机 线性组合 灭磁 智能 仿真 

分 类 号：TM721[电气工程—电力系统及自动化]