基于连续模型的MMC环流谐振分析  

Analysis of MMC Circulating Current Resonance Based on Continuous Model

作　　者：董鹏[1] 张建文[1] 蔡旭[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院风力发电研究中心,上海200240

出　　处：《电源学报》2015年第6期44-50,共7页Journal of Power Supply

基　　金：上海市科委基金资助项目(13dz1200202)~~

摘　　要：模块化多电平变换器(MMC)未来在中高压能源转换领域潜力巨大。桥臂环流的存在是MMC区别于其它多电平变换器的重要特点,子模块电容和桥臂电感参数设计不合理会导致变换器发生环流谐振。首先,依据MMC连续模型,由桥臂电流和正弦调制的相互作用推导出子模块电容电压的解析表达式,子模块电容电压存在不同频率的交流波动分量进而导致桥臂电流中出现不同频率的交流环流;然后,通过分析不同环流谐振频率之间的关系得到避免2倍频环流谐振的元件参数设计依据。最后,利用Matlab/Simulink搭建MMC时域仿真模型验证了理论分析的正确性。Modular multilevel converter（MMC） has enormous potential in the field of high-vohage energy conversion in the future. The presence of arm circulating current is the special feature in MMC which differs from other multilevel converters, the unreasonable design of sub-module capacitance and arm inductance can lead to the occurrence of the circulating current resonance. The analytical expression of capacitor vohage was derived by the interaction of the arm current and sinusoidal modulation based on continuous model, AC ripple components with different frequencies of capacitor voltage lead to the emergence of circulating current with different frequencies in the arm. The design basis of component parameters is avoiding second harmonic circulating current resonance by analyzing the relationship between different resonant frequencies. Finally, a detailed time-domain simulation model of the three-phase MMC was built by using Matlab/ Simulink in order to verify the correctness of theoretical analysis.

关 键 词：模块化多电平变换器(MMC) 环流谐振 电容电压波动 连续模型 

分 类 号：TM46[电气工程—电器]