托克托电厂一期机组异步自励磁问题浅析  

Analysis of Asynchronous Self-excitation Problems of Units in the First Phase of Tuoketuo Power Plant

作　　者：康海燕 黄晓峰 任树东 徐珂 程霞 刘丽莹 KANG Haiyan;HUANG Xiaofeng;REN Shudong;XU Ke;CHENG Xia;LIU Liying(North China Power Engineering Co.,Ltd.,Beijing 100120,China;Tuoketuo Power Plant,Datang International Power Generation Co.,Ltd.,Hohhot 010206,China)

机构地区：[1]华北电力设计院有限公司,北京100120 [2]内蒙古大唐国际托克托发电有限责任公司,呼和浩特010206

出　　处：《大电机技术》2025年第2期49-55,共7页Large Electric Machine and Hydraulic Turbine

摘　　要：本文通过对托克托电厂一期机组29Hz异步自励磁(ASE)事故初析,以及对2号机组异步自励磁试验结果的深入分析,揭示了引发托克托电厂一期机组ASE现象的原因:实际发生ASE时,系统电路是非线性的,发电机电气参数将随机端电流的增大而增大;部分小扰动情况下,机组机端电流暂态峰值较大,使得流过发电机等效阻尼绕组回路的电流较大,直轴阻尼绕组R1d增大,导致发电机电气参数更容易发生ASE。同时分析得出选用发电机异步自励磁试验获得的机端电流录波曲线的初始阶段数据来辨识发电机电气参数更符合实际情况,并基于发电机异步自励磁试验和机组5度角并网试验辨识得到一组发电机电气参数,以此发电机电气参数为输入条件,分别采用电磁暂态法和特征根法对电厂一期机组的ASE进行了风险评估,并通过电磁暂态仿真揭示了小扰动发生时刻的不同是影响机组机端电流暂态峰值大小的主要因素之一。This article analyzes the 29Hz asynchronous self-excitation(ASE)accident of units in first phase of Tokuto Power Plant,as well as the in-depth analysis of the ASE test results of the unit 2.It reveals the reasons for the ASE phenomenon of units in first phase of Tokuto Power Plant:When ASE occurs,the system circuit is nonlinear,and the electrical parameters of the generator will increase with the increase of the terminal current.Under some small disturbances,the transient peak value of the unit terminal current is relatively large,resulting in a larger current flowing through the equivalent damping winding circuit of the generator,and an increase of the direct axis damping winding R1d,which makes the electrical parameters of the generator more prone to ASE.It is analyzed that using the initial stage data of the generator terminal current recording curve obtained from the asynchronous self-excitation test of the generator to identify the electrical parameters of the generator is more in line with the actual situation.Based on the ASE test of the generator and grid connection test at 5-degree angle of the unit,a set of generator electrical parameters were identified.Using the generator electrical parameters as input conditions,the risk assessment of the ASE of the units in first phase of the power plant was conducted using the electromagnetic transient method and the characteristic root method respectively.Through electromagnetic transient simulation,it was revealed that the difference in the time of small disturbance occurrence is one of the main factors affecting the transient peak value of the unit terminal current.

关 键 词：同步发电机 次同步谐振 异步自励磁 电流暂态峰值 

分 类 号：TM712[电气工程—电力系统及自动化]