Harmonic mitigation using multipulse voltage source converter-based HVDC system

This paper proposes a solution for harmonic mitigation in high voltage DC transmission (HVDC) system through 18-pulse transformer fed voltage source converter (VSC). A phase locked loop (PLL) based current controller is proposed in this paper for power quality (PQ) improvement at input AC mains in coordination with DC link voltage control. The proposed system is modeled in MATLAB-SIMULINK environment and its performance is evaluated under various transient conditions such as load decrement, load increment, load variation, single phase fault condition and non-linear load connection for short duration at points-of-common coupling (PCC). The obtained results are presented to demonstrate the effectiveness of the proposed system for harmonic mitigation.