Modeling and impacts analysis of energization transient of EHV/UHV magnetically controlled shunt reactor

摘要

To address the problems of overvoltage, harmonic distortion, and mal‐operation thatrncan occur in protection systems as a result of direct energization in magnetically controlledrnshunt reactors (MCSRs), this paper proposes a novel approach for MCSRrnenergization—namely, pre‐excited energization. Using the structure and operatingrnprinciples of an MCSR, a detailed derivation of energization transient mathematicalrnmodel for both direct and pre‐excited energization are presented and the model‐specificrnimpacts of the 2 different energization modes are investigated. To validate therntheoretical analysis, we performed physical model tests and simulations of differentrnenergization modes. The results indicate that pre‐excited energization is capable ofrnsuppressing overvoltage on the DC link bus and alleviating harmonics caused byrndirect energization.