4 February 2016
HVDC power transmission, power transmission control, optimal control, power grids, particle swarm optimisation, power convertors, reactive power control, HVDC power convertors, voltage source converter-based high voltage direct current transmission optimal power control strategy , unbalanced grid voltage condition, optimisation control strategy, generalised equation, instantaneous active power oscillations elimination, instantaneous reactive power oscillation elimination, particle swarm optimisation algorithm, VSC-HVDC system, PSCAD-EMTDC
This study presents an optimisation control strategy for the power control of voltage source converter-based high-voltage direct current transmission under unbalanced grid voltage conditions. To facilitate simple implementation and flexible operation, the current references are derived and synthesised into one generalised equation that introduces two individually adaptable parameters. The two parameters can be adapted to eliminate the oscillations of instantaneous active and reactive power, as well as the currents at the grid side under unbalanced grid voltage conditions. The optimisation method based on particle swarm optimisation algorithm is presented to determine the two parameters. The simulation is conducted with PSCAD/EMTDC. The results show that the proposed strategy is effective and feasible.