Three-level converters with selective Harmonic Elimination PWM for HVDC application
Paper i proceeding, 2010

In a voltage source converter (VSC) based HVDC system, the modulation scheme used is an important factor in achieving a desired harmonic performance with allowable semiconductor losses. In this paper, the use of selective Harmonic Elimination Pulse Width Modulation (HEPWM) for a three-level Neutral Point Clamped (NPC) converter in VSC based HVDC application will be discussed. Steady state performance of the converter system in terms of harmonics and losses will be evaluated using MATLAB and PSCAD/EMTDC simulation. Simulation results show a 37% improvement in total semiconductor loss with better harmonic performance by using the three-level solution compared to the two-level solution with the stated modulation scheme.


NPC converter

Two-level solution

Three-level solution


Mebtu Bihonegn Beza

Chalmers, Energi och miljö, Elkraftteknik

Staffan Norrga

ABB Corporate Research Center

Energy Conversion Congress and Exposition (ECCE), 2010 IEEE, 12-16 Sept. 2010, Atlanta, GA



Annan elektroteknik och elektronik