基于MATLAB的失磁保护与低励限制配合研究  

Research on the Coordination of Loss of Excitation Protection and Low Excitation Limitation based on MATLAB

作　　者：季杰 黄建琼[2] 薛丽丽 JI Jie;HUANG Jianqiong;XUE Lili(Yalong River Hydropower Development Company Ltd.,Chengdu 610051,China;China National Institute of Measurement and Testing Technology,Chengdu 610051,China)

机构地区：[1]雅砻江流域水电开发有限公司,成都610051 [2]中国测试技术研究院,成都610051

出　　处：《大电机技术》2024年第S1期30-34,41,共6页Large Electric Machine and Hydraulic Turbine

摘　　要：继电保护要求发电机低励限制应先于失磁保护动作,以保证在出现低励情况时励磁系统能够及时调节,避免失磁保护误动。当前,针对低励限制与失磁保护之间的灵敏度关系配合研究,普遍采用手动绘图方法,这种方法准确度不高且耗时较多。本文针对该问题,采用MATLAB研究低励限制与失磁保护在P-Q坐标系下P/Q限制曲线与定子侧静稳极限阻抗圆判据动作曲线,实现两者之间配合关系秒级准确判断,同时还研究了系统阻抗变化对配合灵敏度的影响。本文为发电机失磁保护与低励限制配合研究提供了新方法,具有较强的扩展性,可供同行参考借鉴。Relay protection requires that the generator under-excitation limit should act prior to the loss-of-excitation protection to ensure timely adjustment of the excitation system in case of underexcitation,thereby preventing misoperation of the loss-of-excitation protection.Currently,manual plotting is commonly used for research on the coordination of sensitivity between under-excitation limit and loss-of-excitation protection,this method lacks accuracy and is time-consuming.To address this issue,this paper employs MATLAB to study the P/Q limit curve and the stator-side static stability limit impedance circle criterion action curve of under-excitation limit and loss-of-excitation protection in the P-Q coordinate system,achieving second-level accurate judgment of their coordination relationship.Additionally,the impact of system impedance changes on coordination sensitivity is also investigated.This paper provides a new method for research on the coordination between generator loss-of-excitation protection and under-excitation limit,which has strong extensibility and can serve as a reference for peers.

关 键 词：发电机 失磁保护 低励限制 灵敏度 

分 类 号：TM77[电气工程—电力系统及自动化]