基于简化开关函数的电网换相换流器直流侧简化阻抗建模方法  

Modeling Method for DC Side Simplified Impedance of Line Commutated Converter Based on Simplified Switching Function

作　　者：李永琪 陈代忠 王顺亮[1] 马俊鹏 彭茂兰[2] 冯雷 刘航 LI Yongqi;CHEN Daizhong;WANG Shunliang;MA Junpeng;PENG Maolan;FENG Lei;LIU Hang(School of Electrical Engineering,Sichuan University,Chengdu 610065,China;Extra High Voltage Power Transmission Company,China Southern Power Grid,Guangzhou 510663,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]中国南方电网有限责任公司超高压输电公司,广东广州510663

出　　处：《智慧电力》2023年第5期73-79,共7页Smart Power

基　　金：国家自然科学基金资助项目(51977135);南方电网公司科技项目研究项目(CGYKJXM20210124)。

摘　　要：研究换流器的阻抗频率特性对分析高压直流(HVDC)输电系统的稳定性具有重要意义。提出一种基于简化开关函数的电网换相换流器(LCC)直流侧简化阻抗建模方法。首先通过对LCC换相过程进行数学推导,提出了LCC简化开关函数;然后基于动态相量法,通过LCC交、直流之间谐波传递的分析和计算,得到了LCC直流侧简化阻抗;最后在PSCAD中建立了仿真模型,仿真结果验证了所提方法的有效性,且相比未简化方法提升了计算效率,计算结果更为可靠。所提方法能够降低建模复杂度,可为分析大型复杂系统稳定性提供LCC直流侧阻抗的快速计算模型。The study of converter impedance frequency characteristic is of great significance to analyze the stability of high voltage direct current(HVDC)transmission system.A simplified DC-side impedance modeling method for line commutated converter(LCC)based on simplified switching function is proposed.Firstly,the LCC commutation process is deduced and the simplified switching function of LCC is proposed.Then,based on the dynamic phasor method,through the analysis and calculation of harmonic transmission between AC side and DC side,the simplified impedance of DC side of LCC is obtained.Finally,simulation model is established in PSCAD,and the simulation results show that the proposed method is effective,and the calculation result is more reliable compared with the method without simplification.The proposed method can reduce modeling complexity,provide a faster calculation model of DC side impedance of LCC for analyzing the stability of large complex transmission system.

关 键 词：高压直流 电网换相换流器 开关函数 动态相量 简化阻抗 

分 类 号：TM721[电气工程—电力系统及自动化]