适用于多端直流输电系统的模块化多端口直流潮流控制器

A Modular Multi-Port DC Power Flow Controller for Multi-Terminal DC Transmission System

针对多端直流输电系统潮流控制技术问题,提出了一种模块化多端口直流潮流控制器(MM-DPFC)。与现有DPFC相比,其在保留无需配备外部电源、输电线路功率双向可控以及多端口输出等优势的基础上,保证了DPFC各端口输出电压可基于本地进行独立控制,避免了传统多端口DPFC对输电系统主换流站直流输出电压调节的依赖,增强了其控制方式的灵活性与系统的可靠性。同时,其采用标准模块化设计,易于实现后期的端口拓展与系统冗余。文中首先详细分析了该控制器的拓扑结构与工作原理;然后,设计了相应的控制策略,保证了控制器的有效运行;最后,通过仿真与实验对其进行了多种工况下的验证。

Aiming at the problem of DC power flow control technology in the multi-terminal DC transmission system,a modular multi-port DC power flow controller(MM-DPFC)is proposed in this paper.Compared with the existing DPFC,it retains the advantages of no need of external power supply,bidirectional power control of the transmission line and multi-port output.Besides,it ensures the output voltage of each port of DPFC can be independently controlled based on the local and avoids the dependence on the voltage regulation at the DC outside of the main converter station in the transmission system,which enhances the flexibility and reliability of the system.At the same time,it uses the standard modular design,which easy to achieve the port expansion and system redundancy.Firstly,the topology and working principles of the controller are analyzed in detail.Then,the corresponding control strategy is designed to ensure the effective operation of the controller.Finally,the simulation and experiment are carried out under various conditions to verify it.