| 引用本文: | 钱纹,赵岳恒,邢法财,徐政,陈宇,胡凯,周俊东.MMC的交直流侧扰动特性分析[J].电力自动化设备,2020,40(7): |
| QIAN Wen,ZHAO Yueheng,XING Facai,XU Zheng,CHEN Yu,HU Kai,ZHOU Jundong.AC-and DC-side disturbance characteristic analysis of MMC[J].Electric Power Automation Equipment,2020,40(7): |
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| 摘要: |
| 为规避模块化多电平换流器(MMC)带来的振荡失稳风险，对其交直流侧的受扰动特性进行深入研究。首先，基于桥臂电感和子模块电容的动态特性，建立了MMC的状态空间模型，其中特别考虑直流侧中点电位电压的影响。然后基于频率分量平衡原则，对正常工况以及交直流侧受扰动情况下MMC内部各变量的频率分量进行分析，并建立描述各变量扰动频率分量间对应关系的多频率扰动矩阵。在此基础上，通过时域仿真验证多频率扰动矩阵的准确性，并对次/超同步频段内MMC交直流侧的端口阻抗进行计算。最后，基于阻抗频率特性对MMC的交直流侧扰动放大效应进行分析。分析结果表明，MMC在次/超同步频段内某些频率下会放大系统扰动，且这些频率与系统参数有关。 |
| 关键词: MMC 换流器 扰动特性 频率分量平衡原则 |
| DOI：10.16081/j.epae.202007005 |
| 分类号:TM46 |
| 基金项目:云南电网有限责任公司科技项目(电力系统电力电子化对云南电网的影响及应对策略研究) |
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| AC-and DC-side disturbance characteristic analysis of MMC |
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QIAN Wen1, ZHAO Yueheng1, XING Facai2, XU Zheng2, CHEN Yu1, HU Kai1, ZHOU Jundong1
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1.Grid Planning and Research Center, Yunnan Power Grid Co.,Ltd.,Kunming 650011, China;2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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| Abstract: |
| For avoiding the oscillation instability risk caused by MMC(Modular Multi-level Converter),the AC-and DC-side disturbance characteristics of MMC is deeply researched. Firstly, based on the dynamic characteristics of bridge-arm inductor and sub-module capacitor, the state-space model of MMC is established. Specially, the influence of the DC-side mid-point voltage is considered. Moreover, based on the frequency component balance principle, the frequency components of each variable in MMC under normal situa-tion, AC-and DC-side disturbance situations are analyzed. Meanwhile, the multi-frequency disturbance matrix is derived to describe the relationship among disturbance frequency components of each variable. On the basis, the accuracy of multi-frequency disturbance matrix is verified by time-domain simulation, and the AC-and DC-side port-impedances of MMC are calculated in sub-and super-synchronous frequency range. Finally, the disturbance amplification effect of MMC is further analyzed based on impedance-frequency characteristics. The results indicate that MMC will amplify the disturbance of certain frequencies in sub-and super-synchronous frequency range, and the specific frequency is related to the system parameters. |
| Key words: MMC electric converters disturbance characteristics frequency components balance principle |
