| 引用本文: | 吕敬,蔡旭,张建文.模块化多电平换流器的交直流侧阻抗模型[J].电力自动化设备,2017,37(1): |
| LÜ Jing,CAI Xu,ZHANG Jianwen.AC- and DC-side impedance models of modular multilevel converter[J].Electric Power Automation Equipment,2017,37(1): |
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| 摘要: |
| 模块化多电平换流器(MMC)的阻抗建模是分析基于MMC的电力电子系统交、直流侧谐振及稳定性的基础条件。依据MMC的拓扑结构、运行及控制特性，同时考虑环流控制对MMC交、直流侧阻抗的影响，分别推导了MMC直流侧和交流侧的小信号阻抗解析模型。利用MATLAB/Simulink搭建了三相MMC详细时域仿真模型，采用注入小扰动电压/电流的方法测量MMC交、直流侧的小信号阻抗，与推导的MMC交、直流侧阻抗解析模型的计算结果比较，验证了解析模型的正确性。MMC阻抗模型仿真结果表明：在不加环流控制的情况下，MMC交流侧的小信号阻抗在低频范围内存在谐振峰；而加入环流控制后，该谐振峰能够得到有效抑制。 |
| 关键词: 模块化多电平换流器 阻抗 建模 环流控制 谐振 |
| DOI：10.16081/j.issn.1006-6047.2017.01.021 |
| 分类号: |
| 基金项目:国家高技术研究发展计划(863计划)资助项目(2013AA050601)；上海市科委基金资助项目(12dz1200203) |
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| AC- and DC-side impedance models of modular multilevel converter |
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LÜ Jing, CAI Xu, ZHANG Jianwen
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Wind Power Research Center, Shanghai Jiao Tong University, Shanghai 200240, China
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| Abstract: |
| The impedance modeling of MMC(Modular Multilevel Converter) is the basis for analyzing the resonance and stability at AC and DC sides of MMC-based power-electronics system. While the impact of circulating current control on the AC-and DC-side impedances of MMC is considered, the DC-side and AC-side small-signal impedance analytical models of MMC are respectively derived according to its topological structure, operational features and control characteristics. A time-domain simulation model of three-phase MMC is built with MATLAB/Simulink and the AC-and DC-side small-signal impedances of MMC are calculated based on the derived analytical models, which are compared with the impedances measured by the method of small-disturbance voltage/current injection for verifying the accuracy of the analytical models. The simulative results show that, without circulating current control, the AC-side small-signal impedance has a resonance peak in low-frequency range; the resonance peak could be effectively restrained by the circulating current control. |
| Key words: modular multilevel converter impedance modeling circulating current control resonance |
