Study on VSC-HVDC Active and Reactive Decoupling Control Based on MATLAB/Simulink

Compared with AC transmission, DC transmission has many unique advantages. Active and reactive power in VSC-HVDC system can be independently controlled by d-axis current component and q-axis current component in dq0 coordinate system. In this paper, the general dynamic mathematical model of the VSC-HVDC system based on voltage source converter is established under the synchronous rotating coordinate system, and then the VSC-HVDC decoupling control principle is derived. According to the existing control scheme, the voltage current double loop control method is designed. The VSC-HVDC system is established by using MATLAB/Simulink software. The simulation experiment of this control method proves that it really realizes decoupling control, and the control effect is good. It has fast response speed and good stability for various disturbances and has high stability accuracy at different working points.