METHOD AND SYSTEM FOR INTERCONNECTING HVDC LINES

摘要

Disclosed is a method for interconnecting HVDC lines of similar voltage to obtain a defined DC power transfer therebetween, the lines including at least one controlled line and two or more uncontrolled lines. In the method, DC-to-AC converters are provided in a number that is at least equal in number to the number of uncontrolled lines. DC voltage is superimposed, onto at least one of the controlled lines, to achieve the defined DC power transfer. Power is balanced between the DC-to-AC converters via the exchange of AC power therebetween. DC power is exchanged between the DC-to-AC converters and at least one of the controlled lines to provide net power balance. Also disclosed is a system for carrying out the method.