四端高压直流输电解耦控制的理论分析

Theoretical analysis of four-terminal HVDC decoupling control

在多端高压直流输电系统中,下垂控制能够灵活地控制整个多端直流系统各端电压和功率,只是其控制需要结合解耦控制理论进行。但在多数研究中,关于多端MMC-HVDC的理论分析仍存在一些差异。因此,为使理论分析更为准确,以两端拓扑模型控制理论推导为基础,给出了较为完整的四端高压直流输电解耦控制分析过程,并推导出下垂控制在解耦控制中的完整理论方程,为多端高压直流输电下垂控制的理论分析提供了参考。

In multi -terminal HVDC system, droop control can flexibly control the voltage and power in the whole MTDC system, however it also needs decoupling control theory. In most studies, however, there are still some differences between the theoretical analysis of multi -terminal MMC -HVDC. In order to make the theoretical a- nalysis more accurate, therefore, this paper proposed the complete decoupling control analysis process of the four - terminal HVDC transmission system based on the control theory of the topological model of two terminals, and deduced the complete droop control theoretical equation in deeoupling control, which provided the reference for multi -terminal HVDC droop control theoretical analysis.