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VSC Transmission Operating Under Unbalanced AC Conditions—Analysis and Control Design

Abstract—This paper presents an analysis and a new control

design of a voltage-source converter (VSC) transmission system

operating under unbalanced network conditions. The system

is analyzed in the positive and negative synchronous reference

frames. The proposed control strategy contains a main controller

and an auxiliary controller. The main controller is implemented in

the positive d–q frame using decoupling control without involving

positive/negative-sequence decomposition. The auxiliary controller

is implemented in the negative-sequence d–q frame using

cross-coupling control of negative-sequence current. Simulation

results using the SIMULINK power system blockset show good

performance of the proposed control strategy for a 300-MW

300-kV dc VSC transmission system during both balanced conditions

and unbalanced conditions as may be caused by a solid

single-phase-to-ground fault.

 

 Reference:

1.0 IEEE Transaction Paper - Weblink

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