In this paper

to solve the ice-melting problem of 500 kV long icing line

6-pulse converter parallel high voltage

high current DC ice-melting device is designed. Since the 6-pulse converter generate a large number of harmonics during operation

as well as need a large amount of reactive power provided by power grid during ice-melting operation

therefore

harmonic control and reactive power compensation scheme for FC+TSC（thyristor switched capacitor）is proposed. According to the demand of reactive power and harmonic analysis

FC filter design parameters are given. And joined FC+TSC and nongovernance means the simulation results are compared

the correctness and validity of the system scheme and parameters are verified

which meet the requirements of the power grid.