Dynamic interactions between VSC-HVDC and power system with electromechanical oscillation modes - a comparison between the power synchronization control and vector control

Power synchronization control is a new control strategy of VSC-HVDC for connecting a weak power system. This paper reveals that VSC station used power synchronization control normally is dynamically “coupled” with the power system so that the parameters of reactive loop of the VSC-HVDC will make an impact on dynamic interactions and presents the theoretical analysis to explore existence of more strong dynamic interactions than vector control between the VSC-HVDC and power system under same conditions. Dynamic interactions may occur to affect the damping of the electromechanical oscillation mode which is estimated by participation factors in this paper. At the end of the paper, an example power system is presented to demonstrate and validate the theoretical analysis and associated conclusions are made.