Author:

Keywords:

Science & Technology, Technology, Engineering, Electrical & Electronic, Engineering, HVDC converters, HVDC transmission, voltage droop, voltage-source converter-direct current (VSC-HVDC), STABILITY ANALYSIS, HVDC, 0906 Electrical and Electronic Engineering, Energy, 4007 Control engineering, mechatronics and robotics, 4008 Electrical engineering, 4009 Electronics, sensors and digital hardware

Abstract:

In this paper, a methodology is presented to optimize the dc voltage droop settings in a multiterminal voltage-source converter high-voltage direct-current system with respect to the ac system stability. Implementing dc voltage droop control enables having multiple converters assisting the system in case of a converter outage. However, the abrupt power setpoint changes create additional stress in the ac system, especially when multiple converters are connected to the same interconnected ac system. This paper presents a methodology to determine optimizd converter droop settings in order to not compromise the ac system stability, thereby taking into account the adverse effect the droop control actions have on the interconnected ac system. Developing a disturbance model of the interconnected ac/dc system, the principal directions indicate the gain and directionality of the disturbances; from this, optimal droop settings are derived to minimize the disturbance gain.