| 引用本文: | 张浩,彭克,刘盈杞,姜淞瀚.基于MMC的柔性直流配电系统低频振荡机理分析[J].电力自动化设备,2021,41(5): |
| ZHANG Hao,PENG Ke,LIU Yingqi,JIANG Songhan.Low-frequency oscillation mechanism analysis of flexible DC distribution system based on MMC[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 以采用主从控制的柔性直流配电系统为研究对象，从时域角度提出了直流电压时间尺度下柔性直流配电系统的高阶数学模型，引入阻抗系数对数学模型进行了降阶处理。通过对降阶数学模型的分析，研究了子模块电容、子模块个数等电路参数与控制参数对振荡频率的影响，揭示了柔性直流配电系统低频振荡机理。最后，通过MATLAB/Simulink搭建了基于模块化多电平换流器(MMC)的柔性直流配电系统仿真模型，仿真结果验证了理论分析的正确性。 |
| 关键词: 模块化多电平换流器 柔性直流配电系统 直流电压时间尺度 降阶模型 二阶微分方程 低频振荡 |
| DOI：10.16081/j.epae.202103016 |
| 分类号:TM712;TM727 |
| 基金项目:国家自然科学基金资助项目(51807112) |
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| Low-frequency oscillation mechanism analysis of flexible DC distribution system based on MMC |
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ZHANG Hao, PENG Ke, LIU Yingqi, JIANG Songhan
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College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
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| Abstract: |
| Taking the master-slave controlled flexible DC distribution system as the research object, the high-order mathematical model of flexible DC distribution system under DC voltage time scale is proposed in time domain. Furthermore, the order of mathematical model is reduced by introducing impedance coefficient. By analyzing the reduced-order mathematical model, the influences of control parameters and circuit parameters, such as the capacitance of sub-module and the sub-module number, on the system oscillation frequency are studied, and the low-frequency oscillation mechanism of flexible DC distribution system is revealed. Finally, a simulation model of flexible DC distribution system based on MMC(Modular Multilevel Converter) is built by MATLAB/Simulink, and the simulative results verify the correctness of theoretical analysis. |
| Key words: modular multilevel converter flexible DC distribution system DC voltage time scale reduced-order model second-order differential equation low-frequency oscillation |
