Direct virtual power control of VSC-HVDC for starting up of offshore wind farm

This paper proposes a direct virtual power control algorithm based on the direct power control with space vector modulation (DPC-SVM) for offshore wind farm connected VSC converter. This control algorithm extends the scope of the traditional DPC. By introducing the virtual power, the DPC can work before the wind farm starts up when the AC side of VSC is open and the voltage stability is achieved as well. The calculation of the algorithm is simple by using most of the original DPC-SVM modules. It maintains the controller structure unchanged before and after the wind farm starts up. The correctness and effectiveness of the proposed control algorithm is verified through simulation in PSCAD/EMTDC software.