毕业设计说明书(论文)
大型发电机异常运行
状态的保护及模拟
学生姓名:
班级学号:
院、系、部:
专业: 电气工程及其自动化(继电保护)
指导教师: 讲师
2010年06月南京
Undergraduate Design(Thesis)
Large generators abnormal operation
protection and simulation
BY
Wangqingnan
Supervised by
Lecturer Jiang Zhiping
School of Electric Power Engineering
Nanjing Institute of Technology
June 2010
摘要
随着电力工业的发展,大型发电机组在电力系统中的地位越来越重要,大机组的故障或突然切除,会给电力系统带来很大影响。但是异常状态发生的几率更高,如果处理不当同样会带来较大的危害,所以研究大型发电机的异常运行及保护也是很有必要的。大型发电机的异常状态主要有定子过电压、定子过电流、转子过负荷、失磁、失步等,其中失磁所带来的危害最为严重。本文具体对大型发电机失磁状态进行了分析,然后对发电机各种异常运行的危害做了简要说明。目前失磁保护误动、拒动的情况时有发生,为了对保护判据进行合理改进,就要深入研究失磁的动态过程。在全面理解大型发电机保护原理的基础上,本文重点对失磁保护进行了研究,并用MATLAB对失磁进行了仿真。
关键词发电机异常运行,失磁,MATLAB
Abstract
With the power industry developing and the capacity of single generator growing ,the large generator-transformer units play more important roles in power system, and the demands for higher performance of large generator protection is necessary. However, the probability of abnormal operation is higher, if handled improperly it will bring greater harm, so the study of the abnormal operation of generators is necessary too. The abnormal state of large generator main stator over-voltage, stator over-current and rotor overload, loss of excitation, out-of-step, etc. Which brought about by the loss of excitation is the most serious. This paper analyses various abnormal operation of the large generators and t
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