Function-Based Modulation Control for Modular Multilevel Converters under Varying Loading and Parameters Conditions
Function-Based Modulation Control for Modular Multilevel Converters under Varying Loading and Parameters Conditions
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DOI：
10.1049/iet-gtd.2016.1028
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发表时间：
2017-09
影响因子：
2.5
通讯作者：
M. Mehrasa;E. Pouresmaeil;M. Akorede;S. Zabihi;J. Catalão
中科院分区：
文献类型：
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作者：
M. Mehrasa;E. Pouresmaeil;M. Akorede;S. Zabihi;J. Catalão
提出了一种基于函数的模块化多电平变换器调制控制新技术。本研究的主要贡献是分别为MMC上下子模块所需的开关信号制定了两个新的调制函数。采用变换器的输出和循环电流方程来获得用于所提出的调制函数的手臂电流，该调制函数具有两个重要特征：(i)与现有的MMC控制方法相比，它的复杂性要低得多；（ii）所提出的控制器可以适当调节以处理参数变化，以确保稳定和准确的性能。在该控制器中，特殊有功和无功分担所需的MMC输出电流大小和相位角可以很容易地应用于调制函数。根据所提出的调制函数，讨论了上下子模块的等效电容。最后，在Matlab/Simulink环境中进行了仿真，以评估所提出的控制技术在负载动态条件和变参数条件下的性能。
This study presents a new function-based modulation control technique for modular multilevel converters (MMCs). The main contribution of this study is the formulation of two new modulation functions for the required switching signals of the MMC's upper and lower sub-modules, respectively. The output and circulating current equations of the converter are employed to attain the arm's currents which are utilised for the proposed modulation functions, which have two important features: (i) it is much less complex compared to the existing control methods of MMC; and (ii) the proposed controller can be regulated properly to deal with parameter variations in a bid to ensure stable and accurate performance. In this controller, the MMC output current magnitude and phase angle required for special active and reactive power sharing can be easily applied to the modulation functions. Also, the equivalent capacitors of upper and lower sub-modules are discussed based on the proposed modulation functions. Finally, simulations are performed in Matlab/Simulink environment to evaluate the performance of the proposed control technique in both the dynamic conditions of load as well as varying parameters.