换流变压器损耗现场测试影响因素及仿真  

Influence Factor and Simulation of the Loss of the Converter Transformer On-site Testing

作　　者：周远翔[1] 刘心曲 王明渊[1] 黄建文[1] 曾向军 宓传龙 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京100084 [2]南方电网科学研究院,广州510080 [3]西安西电变压器有限责任公司,西安710049

出　　处：《高电压技术》2016年第5期1608-1616,共9页High Voltage Engineering

基　　金：南方电网公司科技项目(KY2014-2-0016);国家重点基础研究发展计划(973计划)(2011CB209400)~~

摘　　要：换流变压器是高压直流输电系统的核心设备,其损耗将会对直流输电系统的稳定性产生影响,因而备受关注。因此,首先探究了换流变压器空负载损耗的影响因素,并利用Matlab软件的Simulink平台进行了仿真分析。仿真结果表明:对于换流变压器的空载损耗,谐波次数和谐波电压畸变率的增加使得空载损耗下降,但下降幅度较小,其中5、7次谐波对空载损耗的影响最大;对于换流变压器的负载损耗,谐波次数和谐波电流畸变率的增加使得负载损耗增加,幅度较大,且谐波次数和畸变率对负载损耗的影响远大于空载损耗。然后,提出了适用于换流变压器现场测量的含附加电阻的换流变压器谐波等值电路,利用谐波损耗新模型与常规谐波等效电路对换流变压器谐波损耗进行计算,并将计算结果与IEC方法的计算结果进行对比,对比结果验证了新模型的合理性。根据本文提出的方法,可以对换流变压器损耗现场测试结果进行校正,因此对换流变压器的现场试验具有重要的工程意义。The loss of convert transformer, as a core device of high voltage direct current（HVDC）, has some effects on the stability of HVDC transmission system. Consequently, we researched the no-load loss and its influential factors on converter transformer, and simulated the loss by using the Simulink platform of Matlab. The simulation results show that, for the converter transformer no-load loss, when the harmonic frequency and harmonic voltage distortion rate increase, the no-load loss slightly decreases, and the fifth and the seventh harmonics have the most remarkable impact; for the converter transformer load loss, when the harmonic frequency and harmonic current distortion rate increase, the load loss remarkably increases, and the harmonic frequency and harmonic distortion rate have greater impact to the load loss than to the no-load loss. Moreover, we put forward the converter transformer harmonic equivalent circuit containing additional resistance which is suitable for converter transformer on-site measurement, adopted a new harmonic loss model and the conventional harmonic equivalent circuit to calculate the converter transformer harmonic loss, and compared the results with those by the IEC method.It is verified the new model of harmonic loss is reasonable. According to the proposed method, the results of the loss of the converter transformer on-site testing can be corrected, so it has important engineering significance to the converter transformer on-site testing.

关 键 词：换流变压器 现场测试 空载损耗 负载损耗 谐波次数 畸变率 

分 类 号：TM721.1[电气工程—电力系统及自动化]