Control of a Modular Multilevel Converter With Reduced Internal Data Exchange
Control of a Modular Multilevel Converter With Reduced Internal Data Exchange
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DOI：
10.1109/tii.2016.2598494
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发表时间：
2017-02
影响因子：
12.3
通讯作者：
L. Mathe;P. Burlacu;R. Teodorescu
中科院分区：
文献类型：
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作者：
L. Mathe;P. Burlacu;R. Teodorescu
模块化多电平变换器（MMC）由于其优越的性能而得到广泛应用。由于变换器的模块化结构，必须在子模块（SMs）和中央控制器（CCU）之间建立通信平台。在为此类应用设计通信平台时，必须考虑几个关键参数，如低传播延迟的高速数据传输、数据完整性和精确同步的能力。为了最小化MMC中的数据流，提出了一种分层控制方法，其中CCU为所有SMs计算相同的参考，而调制和电容电压平衡则在来自SM的控制器中执行。因此，在每个采样实例中，中央控制器只从SM向控制器发送四个字节的引用，而从SMs接收一个或两个字节。最后，通过实验对控制算法进行了验证。
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.