计及变压器铁芯饱和的LCC-HVDC输电系统谐波不稳定性评估与应用  

Harmonic instability evaluation of LCC-HVDC transmission system considering transformer core saturation and its application

作　　者：刘对 李晓华[1] 蔡泽祥[1] 蔡苏斌 LIU Dui;LI Xiaohua;CAI Zexiang;CAI Subin(School of Electric Power,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《电力自动化设备》2021年第3期85-91,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766213);国家自然科学基金资助项目(51677073)。

摘　　要：基于端口理论构建了基于电网换相换流器的高压直流(LCC-HVDC)输电系统的完整模型,综合考虑了直流两端换流器、平波电抗器、交直流滤波器以及换流变压器铁芯饱和的影响。利用该模型对不同的网络参数及运行工况进行谐波稳定性判别,并与PSCAD/EMTDC时域仿真平台上详细LCC-HVDC输电系统模型仿真结果对比,验证了所提模型的可行性与准确性。将所提模型应用于谐波不稳定性判别,不仅计算方法简单,而且能够较好地反映不同参数对谐波稳定性的影响,其对LCC-HVDC输电系统谐波不稳定影响因素分析可为LCC-HVDC输电系统的规划、运行提供参考。A complete model of LCC-HVDC(Line Commutated Converter based High Voltage Direct Current)transmission system is constructed based on port theory,and the effects of converters at both ends of LCCHVDC,smoothing reactors,AC/DC filters and the saturation of converter transformer core are comprehensively considered.The model is used to analyze the harmonic stability under different network parameters,opera-ting conditions,and compared with the simulative results of detailed LCC-HVDC transmission system model on PSCAD/EMTDC time domain simulation platform,which verifies the feasibility and accuracy of the proposed model.The proposed model applied to the identification of harmonic instability is not only simple to calculate,but also can reflect the influence of different parameters on the harmonic stability.The analysis of influencing factors on harmonic instability can provide reference for the planning and operation of LCC-HVDC transmission system.

关 键 词：LCC-HVDC输电系统 谐波不稳定性 二端口 开关函数 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM42[电气工程—电器]