适用于多端柔性直流电网的潮流控制器

多端柔性直流电网以优良的性能在清洁能源消纳方面发挥了重要作用，但其潮流难以灵活控制，需引入潮流控制器来改善潮流分布。对此，提出了一种适用于多端柔性直流电网的新型直流潮流控制器，其具有配置成本低、调节范围广和运行损耗小的优势。潮流控制器利用全控型开关动态投切电容、电阻来改变线路等效电阻，实现了潮流控制功能。此外，设计了含电压限制环节和电流差增益环节的控制系统，降低了拓扑的配置成本和运行损耗。最后，通过电磁暂态仿真与低压物理试验验证了所提直流潮流控制器的有效性与可行性。

A current flow controller suitable for MTDC grids

The multi-terminal flexible DC grid has an important role in integrating renewable energy owing to its excellent advantages. However, the current flow in a multi-terminal flexible DC grid cannot be controlled flexibly, so a current flow controller is required to improve the distribution. Therefore, this paper presents a new topology of current flow controller suitable for a multi-terminal flexible DC grid. It has the advantages of low implementation cost, wide adjustment range, and low operational power loss. The current flow controller uses the switch to dynamically insert the capacitance and resistance to change the line equivalent resistance. This realizes the current flow control function. The control system including voltage limiting link and current difference gain link is designed to reduce the implementation cost and operational power loss. Finally, the effectiveness and feasibility of the proposed DC current flow controller are verified by electromagnetic transient simulation and low voltage physical experiment. This work is supported by the National Natural Science Foundation of China (No. 52077124).