Method of controlling the power input to a HVDC transmission link

摘要

Disclosed is a method of controlling the power input to a HVDC transmission link, which HVDC transmission link is connected to an AC power plant via a first voltage source converter and to AC grid via a second voltage source converter, which method includes using the second voltage source converter to perform voltage control of the HVDC transmission link during a no-fault mode of operation of the grid; monitoring a HVDC transmission link parameter to detect an unbalanced fault; and using the first voltage source converter to regulate the output of the AC power plant on the basis of the monitored HVDC transmission link parameter in the event of an unbalanced fault. Also described are a control module for controlling the power input to a HVDC transmission link; a voltage source converter for a power plant; and a power generation and transmission arrangement.

主权项

1. A method of controlling the power input to a high-voltage direct-current (HVDC) transmission link, the HVDC transmission link is connected to an alternating-current (AC) power plant via a first voltage source converter and to an AC grid via a second voltage source converter, the method comprising:
performing voltage control of the HVDC transmission link during a no-fault mode of operation of the grid via the second voltage source converter; monitoring a HVDC transmission link parameter to detect an unbalanced fault; regulating the output of the AC power plant via the first voltage source converter in the event of an unbalanced fault, which is on the basis of the monitored HVDC transmission link parameter; and wherein the regulating the output of the AC power plant comprises providing unbalanced multi-phase voltage reference signals at a collector network of the AC power plant; and wherein the unbalanced multi-phase AC voltage reference signals are comprised of three voltage signals of different magnitudes for the collector network of a three-phase AC power plant.