PROJECT TITLE :

Hybrid HVDC for Integrating Wind Farms With Special Consideration on Commutation Failure

ABSTRACT:

This paper presents the management and operation of a hybrid HVDC system comprising a wind farm-aspect voltage-supply converter rectifier and a grid-side LCC inverter for integrating wind power. The configuration and operation principle of the hybrid HVDC system are described. Commutation failure within the LCC inverter throughout an ac network disturbance is considered and its impact on the hybrid system operation is analyzed. An enhanced control strategy for the LCC inverter at the grid facet and an alternative modular multilevel converter (MMC) topology using mixed half-bridge and full-bridge modules considered for the rectifier at the wind farm side are proposed. Simulation results using Matlab/Simulink are presented to demonstrate the sturdy performance during LCC inverter commutation failure to validate the operation and recovery of the hybrid system with the proposed management strategy and MMC configuration.