The basic situation of high-order harmonics is introduced in Luxi station on the side of Guangxi on April 10

2017

which is based on the background of voltage source converter based high voltage direct current(VSC-HVDC)project for back-to-back asynchronous connection of Luxi station in China southern power grid. The key parts in the harmonics magnification mechanism and effects are analyzed in detail and simulated

which obtains the relationship among the high-order harmonics phenomenon

the sample part of forward control loop of VSC-HVDC grid voltage and the system harmonic impedance. Moreover

the function among the parameters of voltage feedforward control

the harmonic impedance of the system

the harmonic frequency and amplitude is derived. Then

the measures of designing reasonable filter to avoid the high-order harmonics in voltage feedforward control loop are proposed. Through the simulation and field test

the effectivity of the proposed method is verified.