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Control of a Modular Multilevel Converter With Reduced Internal Data Exchange

机译：减少内部数据交换的模块化多电平转换器的控制

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摘要

Modular multilevel converters (MMC) are penetrating due to their superior performances. Due to the modular structure of the converter, communication platform has to be established between the submodules (SMs) and a central controller unit (CCU). When the communication platform is designed for such an application, several key parameters have to be considered such as high-speed data transfer with low propagation delay, data integrity, and ability for accurate synchronization. In order to minimize the data flow in the MMC, a hierarchical control is proposed where a CCU calculates an identical reference for all the SMs, while the modulation and capacitor voltage balancing is performed in the controller from the SM. Thus, at each sampling instance, only four bytes references are sent by the central controller to the controllers from the SM, while one or two bytes are received from SMs. Furthermore, the control algorithm is validated through experiments.
机译：模块化多电平转换器（MMC）由于其卓越的性能而不断渗透。由于转换器的模块化结构，必须在子模块（SM）与中央控制器单元（CCU）之间建立通信平台。当为此类应用设计通信平台时，必须考虑几个关键参数，例如具有低传播延迟的高速数据传输，数据完整性以及精确同步的能力。为了最小化MMC中的数据流，提出了一种分级控制，其中CCU为所有SM计算相同的参考，而调制和电容器电压平衡则由SM在控制器中执行。因此，在每个采样实例中，中央控制器仅将四个字节参考从SM发送到控制器，而从SM接收一个或两个字节。此外，通过实验对控制算法进行了验证。

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