Reduced Current Sensor 12-pulse VSC based HVDC System with Power Quality Control

This paper investigates the basic proportional integral (PI) controller for power quality (PQ) improvement using a 12-pulse voltage source converter (VSC) based high voltage direct current (HVDC) transmission system. The PI controller's parameters are selected using Zeigler Nichols approach and applied for PQ improvement during various transients. A reduced current sensor topology is used to minimize control complexity. The proposed system is designed, modelled and simulated in MATLAB-Simulink environment under various transient conditions such as load perturbation, voltage sag, tapped load fault at points-of-common coupling and single line to ground (SLG) fault at input AC mains. The obtained results are presented to demonstrate power quality improvement at point of common coupling (PCC) and effectiveness of the proposed control approach in handling various transient conditions.