Reactive Power and AC Voltage Support from Flexible LCC HVDC to Wind Energy Integrated Power System

Abstract

Conventional LCC HVDC system is unable to provide dynamic reactive power and AC voltage support to power system during transient events. This can have adverse impacts on the renewable generation that is connected to the same power system such as wind farms. This paper aims to demonstrate that the Flexible LCC HVDC system can provide dynamic reactive power and AC voltage support to a wind integrated power system. The Flexible LCC HVDC system is able to quickly inject reactive power into the system, reducing the voltage drop and increasing the speed of voltage recovery. This will help the wind farms in riding through the fault. At the same time, due to the elimination of Commutation Failure (CF) in the Flexible LCC HVDC system, it is able to maintain a relatively stable active power transfer as well. Simulation comparisons between the conventional LCC HVDC and the Flexible LCC HVDC based on a wind integrated two area power system have been presented to validate the performance.