Point of common coupling voltage recovery capability improvement of offshore wind farm connected to a weak grid through high voltage direct current link

Abstract

Large offshore wind farms using high voltage direct current transmission system have been considered and exploited in a few countries in the world. Maintaining stable operation of the wind farm is an important issue. Previous studies only proposed some methods to improve the fault ride-through capability of the wind farm as it is connected to a quite strong system, resulting in recovery of the voltage at the point of common coupling (PCC) after clearance of onshore gridfault. This paper will evaluate the PCC voltage recovery ability of the wind farm when it is connected to a weak grid and suggest a new method to overcome unrecoverable voltage problem. The effectiveness of the proposed control strategies is proven by simulation results. V C 2012 American Institute of Physics.