A method for incorporating VSC-HVDC into the overall grid voltage-reactive power control task

This paper presents an approach for incorporating VSC - HVDC embedded in AC networks into the secondary voltage control strategy of the network, in addition to the dynamic voltage support requirements following grid short circuits. The models of the hierarchical two-stage slow and fast-acting controllers have been described in detail and the coordination of the steady state (set-point tracking) part and the component responsible for dynamic voltage support explained. Simulation examples demonstrate that the disturbance as well as the reference tracking components operate without interfering with the operation of one another, and thus confirm the possibility of incorporating VSC HVDC into the overall network var dispatch strategy.