Study on Ratings of Smoothing Reactor in Back-to-back HVDC Transmission System

According to the intrinsic characteristics of the back-to-back HVDC transmission system, this paper ana-lyzes how to determine the smoothing reactors steady rating and transient rating of back-to-back HVDC transmission system, including the selection and calculation of harmonic voltage source parameters related for calculating smoothing reactor steady rating, the construction of simulation circuit for calculating smoothing reactor steady rating, the faults which could happen of smoothing reactors for back-to-back HVDC transmission system and the methods for calculating smoothing reactor typical faults. This paper takes Yunnan power grid and southern power grid asyn-chronous link Luxi back-to-back HVDC transmission project as an example, calculates the steady rating and transient rating of smoothing reactors, and determines the insulation level of smoothing reactors.