摘要
随着对直流输电灵活控制的要求的增加,大量以模块化多电平换流器(MMC)拓扑结构换流器的柔性直流输电工程投入建设及运行。国家"863"计划项目南方电网南澳多端柔性直流输电工程云南鲁西背靠背柔性直流输电工程,其换流器设备都是采用目前较为先进的MMC拓扑结构。而作为换流器起动前的预充电过程也得到了广泛的研究,而采用充电电阻的不控充电方式得到了大量柔直工程的青睐。本文研究了MMC换流器起动前的预充电过程,采用PSCAD仿真软件,结合某国外柔直项目工程设计参数,搭建了整体的系统模型,根据不控充电的方式搭建了充电电阻的模型,通过仿真结果给出了起动电阻的选择建议,并阐述了通过仿真的手段对柔直项目充电起动电阻器的选择的指导意义。
With the increasing demand for flexible control of DC transmission,a large number of flexible HVDC transmission projects with MMC(modular multilevel converter)topology converter are put into construction and operation.Such as the national"863"project of China Southern Power Grid Nan'ao flexible HVDC project,and Yunnan Luxi back-to-back flexible HVDC project,the converter equipment are based on the topological structure of MMC is more advanced at present.And pre-charging of the converter has been widely studied,charging resistance of the uncontrolled charging method has been a large number of flexible engineering favor.In this paper,the basic structure and working principle of the modular multilevel converter DC transmission are introduced.The principle of MMC-HVDC is introduced,and the pre charging process of MMC converter is introduced.Finally,by PSCAD simulation,combined with the design parameters of a foreign flexible project.The selection of starting resistance is obtained by the simulation results the guiding significance of the selection of the charging starting resistor for the flexible HVDC project is described.
作者
张智
刘丽楠
Zhang Zhi;Liu Li’nan(Beijing Rongxin HUICO Technology Co.,Ltd,Beijing 100193;China North Vehicle Research Institute,Beijing 100072)
出处
《电气技术》
2018年第8期101-108,共8页
Electrical Engineering
