Simulink基于机网协调的大型机组继电保护研究.docVIP

Simulink基于机网协调的大型机组继电保护研究 摘要随着现在的电力系统中超临界大容量机组越来越多地投入运行，大型发电机组的继电保护对于快速排除机组故障、保证系统稳定运行的影响也越来越大；发电厂根据设备参数自行整定发电机各种保护定值，易不符合电网运行安全性和稳定性要求，因此在机网协调的背景下对电厂机组进行保护整定计算具有很重要的意义。本基于机网协调原则，对大型发电机组失磁保护和失步保护进行整定计算，分别对低励限制和失磁保护的配合、失步保护和失磁保护之间的配合进行了讨论，并利用Matlab/Simulink平台搭建了单机无穷大系统，对失磁保护和失步保护进行了仿真，对两种保护配合也进行了仿真讨论。仿真结果和理论分析一致，具有一定的实用性。11530 关键词：大型发电机组 机网协调 继电保护 低励限制 失磁保护 失步保护 毕业设计说明书（论文）外文摘要 TitleResearch on relay protections of large generator unit connect with power system Abstract As more and more supercritical large capacity units are put into power system,relay protection for large generator-transformer units becomes more and more influential in quick troubleshooting and guaranteeing stability of the system. It is not easy to meet the security and stability requirements of power network operation,if power plants self-tune protection settings according to equipment parameters.Therefore,protection setting calculation on generator-transformer units has great significance in the backgroud of coordinating generators with electrical network.Setting calculation on loss of excitation protection and out of step protection for large generator-transformer units is based on principles of coordinating generators with electrical network in this paper.Cooperation between underexcitation limit and loss of excitation protection and cooperation between loss of excitation protection and out of step protection are discussed respectively.A single machine infinite bus system is built using Matlab/Simulink platform.The system simulates loss of excitation protection and out of step protection.It also simulates and discusses the two cooperations.The simulation results have a certain practicability as they are consistent with theoretical analysis. 5.2失步保护仿真33 5.3失步保护和失磁保护配合仿真36 结论40 致谢41 参考文献42 1引言 1.1选题的背景和意义 近年来我国电力行业发展迅速，电力系统规模日趋庞大，电压等级进一步提高，超临界大容量的机组也不断投入运行。这些机组运行状况的好坏将直接影响到电力系统的稳定、安全可靠和经济运行。大型发电机组继电保护能够快速排除机组故障、保证系统稳定运行，而大型发电机组的自动装置能在异常工作情况下进行自动调整，进一步保证了系统的安全性、减小故障破坏范围、尽可能避免不必要的故障停机，防止保护