一种适用于MMC的混合步长电磁暂态仿真方法  

A hybrid step-size electromagnetic transient simulation method suitable for MMC

作　　者：林毅 林威 刘鑫 刘崇茹 LIN Yi;LIN Wei;LIU Xin;LIU Chongru(State Grid Fujian Economic Research Institute,Fuzhou 350000,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]国网福建省电力有限公司经济技术研究院,福建福州350000 [2]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电力科学与技术学报》2023年第2期58-66,共9页Journal of Electric Power Science And Technology

基　　金：国网福建省电力有限公司科技项目(52130N20000C)。

摘　　要：随着“双碳”目标的提出,大量新能源接入电网,以模块化多电平换流器(modular multilevel converters high voltage dc,MMC)为代表的柔性直流输电系统获得广泛的工程应用。而电磁暂态仿真在MMC系统规划与运行过程中均发挥重要作用,但是大步长机电暂态仿真精度不足,小步长电磁暂态仿真耗时过长,无法适应MMC的发展需求。因此基于混合仿真的基本思想,将MMC详细等效模型拆分为交流和直流两部分,建立了接口等值模型,提出数据交互算法,从而实现交流系统使用大步长仿真、直流系统采用小步长仿真。基于PSCAD/EMTDC的MMC系统仿真验证表明,混合仿真方法相较于大步长机电暂态仿真的仿真精度明显提高,相较于小步长电磁暂态仿真的仿真时间大幅缩短。With the proposal of"double carbon"goal,many new energy sources are connected to the power grid,and the flexible DC transmission system represented by modular multilevel converters(MMC)has been widely used in engineering.Electromagnetic transient simulation plays an essential role in the planning and operation of the MMC system,but the accuracy of the large-step electromechanical transient simulation needs to be improved,and the small-step electromagnetic transient simulation takes too long to meet the development needs of MMC.Therefore,based on the basic idea of the hybrid simulation,the MMC detailed equivalent model is divided into AC and DC parts,the interface equivalent model is established,and the data interaction algorithm is proposed,so as to realize the long-step simulation of AC system and small-step simulation of DC system.The simulation verification of the MMC system based on PSCAD/EMTDC shows that the simulation accuracy of the hybrid simulation method is obviously improved compared with the large-step electromechanical transient simulation,and the simulation time is greatly shortened compared with the small-step electromagnetic transient simulation.

关 键 词：模块化多电平换流器 混合步长仿真 接口模型 仿真精度 

分 类 号：TM744[电气工程—电力系统及自动化]