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

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

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

Last modified on Thursday, 30 June 2016 22:49

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