In meshed high voltage direct current grids, the current of each line cannot be controlled independently, since it depends on the resistances between nodes. Additional devices, such as current flow controllers (CFCs), may be needed to avoid bottlenecks or line overloads. This work presents a multiport dc-dc-based CFC topology to be connected to n lines with unidirectional current flows. The device is able to control the dc lines' currents to the desired value by inserting variable voltage sources in series. First, the modeling of the generic n-port topology is presented and then, its modulation and control strategy are described. In the first case study, the concept is validated considering a 5-port CFC by means of dynamic simulations using different control methods. Finally, in the second case study, a 3-port CFC prototype is built and tested in an experimental platform in the laboratory considering different control modes.

中文翻译：

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适用于网状 HVDC 电网的多端口行间电流控制器


在网状高压直流电网中，每条线路的电流无法独立控制，因为它取决于节点之间的电阻。可能需要额外的设备，例如电流控制器 (CFC)，以避免瓶颈或线路过载。这项工作提出了一种基于多端口 DC-DC 的 CFC 拓扑，可连接到具有单向电流的 n 条线路。该设备能够通过串联插入可变电压源将直流线路的电流控制到所需值。首先，介绍了通用 n 端口拓扑的建模，然后描述了其调制和控制策略。在第一个案例研究中，通过使用不同控制方法的动态仿真，考虑 5 端口 CFC，验证了这一概念。最后，在第二个案例研究中，考虑不同的控制模式，在实验室的实验平台上构建并测试了 3 端口 CFC 原型。