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Modular Multilevel Converter Switching Frequency Harmonics Analysis and Suppression Through Cell Voltage Control
IEEE Open Journal of Power Electronics Pub Date : 2020-06-02 , DOI: 10.1109/ojpel.2020.2997211 Lu Wang , Yanjun Shi , Matthew Bosworth , Dionne Soto , Michael Steurer
IEEE Open Journal of Power Electronics Pub Date : 2020-06-02 , DOI: 10.1109/ojpel.2020.2997211 Lu Wang , Yanjun Shi , Matthew Bosworth , Dionne Soto , Michael Steurer
This paper investigates the impact of reference's bias on the high frequency voltage spectrum for the modular multilevel converters (MMC). Analytical solution of the voltage spectrum under carrier Phase Shifted Pulse Width Modulation (PSPWM) is derived using double Fourier integral analysis. The distribution of the switching frequency voltage harmonics is found to be directly related to the ratio between the dc-link voltage and the cell voltage. A control method utilizing this phenomenon is thereby proposed to suppress switching frequency harmonics in the Differential Mode Voltage (DMV) and Common Mode Voltage (CMV). Cell voltage control trade-offs considering different cell numbers, different ac voltages, 3
rd harmonics injection, and cell voltage stress are also investigated. The analysis and control method are validated through experiments on a 1.25 megawatt MMC testbed.
中文翻译:
单元电压控制的模块化多电平转换器开关频率谐波分析与抑制
本文研究了模块化多电平转换器(MMC)的基准偏置对高频电压频谱的影响。利用双傅里叶积分分析推导了载波相移脉宽调制(PSPWM)下电压谱的解析解。发现开关频率电压谐波的分布与直流母线电压和电池电压之间的比率直接相关。因此,提出了一种利用该现象的控制方法来抑制差模电压(DMV)和共模电压(CMV)中的开关频率谐波。考虑不同电池数量,不同交流电压的电池电压控制权衡,第3 次还研究了谐波注入和电池电压应力。通过在1.25兆瓦MMC测试台上进行的实验验证了该分析和控制方法。
更新日期:2020-06-02
中文翻译:
单元电压控制的模块化多电平转换器开关频率谐波分析与抑制
本文研究了模块化多电平转换器(MMC)的基准偏置对高频电压频谱的影响。利用双傅里叶积分分析推导了载波相移脉宽调制(PSPWM)下电压谱的解析解。发现开关频率电压谐波的分布与直流母线电压和电池电压之间的比率直接相关。因此,提出了一种利用该现象的控制方法来抑制差模电压(DMV)和共模电压(CMV)中的开关频率谐波。考虑不同电池数量,不同交流电压的电池电压控制权衡,第3 次还研究了谐波注入和电池电压应力。通过在1.25兆瓦MMC测试台上进行的实验验证了该分析和控制方法。