基于LM法的换流站关键设备宽频建模方法研究  

Broadband Modeling of Key Equipment in Converter Station Based on Levenberg-Marquardt Algorithm

作　　者：董靓靓 王顺亮 马俊鹏 刘天琪[1] 彭光强 吴子豪[3] 王若谷[3] DONG Liangliang;WANG Shunliang;MA Junpeng;LIU Tianqi;PENG Guangqiang;WU Zihao;WANG Ruogu(College of Electrical Engineering,Sichuan University,Chengdu 610041,China;CSG EHV Power Transmission Company,Guangzhou 510700,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710100,China)

机构地区：[1]四川大学电气工程学院,四川成都610041 [2]南方电网超高压输电公司检修试验中心,广东广州510700 [3]国网陕西电力科学研究院,陕西西安710100

出　　处：《智慧电力》2022年第2期9-14,21,共7页Smart Power

基　　金：国家自然科学基金资助项目(51977135);国家电网有限公司科技项目(SGTYHT/19-JS-215)。

摘　　要：直流输电系统换流站存在多种产生或传输谐波的电气设备,建立适用于仿真研究的换流站宽频模型十分重要。传统建模方法较为复杂,且不适用于低阶等效模型。因此,基于元件物理模型和阻抗特性,利用列文伯格-马夸尔特算法求解宽频模型参数、拟合阻抗特性曲线,并简化了宽频模型。然后据此建立了晶闸管、平波电抗器和换流变压器等换流站关键设备的宽频模型,验证了该方法的正确性。最后,将元件宽频模型等效电路应用于仿真模型,仿真对比表明宽频模型相比于理想模型,5次谐波幅值减小约基波的1.7%~1.8%,并且简化宽频模型可以加快仿真速度。There are many kinds of electrical equipments generating or transmitting harmonic in the converter station of HVDC system. It is very important to establish broadband model for the converter station to carry out simulation study. Traditional modeling methods are complex and not suitable for low-order equivalent models. Firstly,based on the physical model of component and impedance characteristics,this paper uses Levenberg-Marquardt algorithm to solve the broadband model parameters,fits the impedance characteristic curve,and simplifies the broadband model. Then the broadband model of thyristor,flat-wave reactor and converter transformer is established to verify the correctness of the proposed method. Finally,the equivalent circuit of the broadband model is applied to the simulation model. The simulation comparison shows that the amplitude of the fifth harmonic of the broadband model decreases about 1.7%~1.8% of the fundamental wave compared with an ideal model,and the simplified broadband model can accelerate the simulation speed.

关 键 词：换流站 阻抗特性 宽频模型 列文伯格-马夸尔特算法 谐波特性 

分 类 号：TM743[电气工程—电力系统及自动化]