A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters
A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters
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DOI：
10.1109/tpel.2014.2304978
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发表时间：
2015
影响因子：
6.7
通讯作者：
Liqun He;Kai Zhang;J. Xiong;Shengfang Fan
中科院分区：
文献类型：
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作者：
Liqun He;Kai Zhang;J. Xiong;Shengfang Fan
在模块化多电平变换器（MMC）中，开关动作与子模块电容电压波动之间的相互作用导致循环电流中的二次谐波和其他偶次谐波。这些谐波电流将引入额外的功率损耗，增加电力设备的电流应力，甚至在瞬变过程中造成不稳定。传统的循环电流谐波抑制方法存在抑制谐波能力有限、适用范围有限、实现复杂等问题。本文提出了一种插件式重复控制方案来解决这一问题。它结合了PI控制器的高动态特性和重复控制器良好的稳态谐波抑制性能，最大限度地减少了两个控制器之间的干扰。它适用于多重谐波抑制，易于实现，适用于单相和三相mmc。在单相MMC逆变器上的仿真和实验结果证明了该控制方法的有效性。
In a modular multilevel converter (MMC), the interaction between switching actions and fluctuating capacitor voltages of the submodules results in second- and other even-order harmonics in the circulating currents. These harmonic currents will introduce extra power loss, increase current stress of power devices, and even cause instability during transients. Traditional methods for circulating current harmonic suppression have problems such as limited harmonic rejection capability, limited application area, and complex implementation. This paper presents a plug-in repetitive control scheme to solve the problem. It combines the high dynamics of PI controller and good steady-state harmonic suppression of the repetitive controller, and minimizes the interference between the two controllers. It is suitable for multiple harmonic suppression, easy to implement, and applicable for both single-phase and three-phase MMCs. Simulation and experimental results on a single-phase MMC inverter proved the validity of the proposed control method.