کنفرانس مهندسی برق ایران

صفحه اصلی / سی و سومین کنفرانس بین المللی مهندسی برق

Enhanced Current Commutation Drive Circuit for Hybrid DC Circuit Breaker

نویسندگان :

Alireza Jaafari¹ Sadegh Mohsenzade² Ali Asghar Razi-Kazemi³

1- دانشگاه صنعتی خواجه نصیرالدین طوسی 2- دانشگاه صنعتی خواجه نصیرالدین طوسی 3- دانشگاه صنعتی خواجه نصیرالدین طوسی

کلمات کلیدی :

Current Commutation Drive Circuit (CCDC)،Sectional capacitor array،DC circuit breaker (DCCB)

چکیده :

The development of medium voltage DC (MVDC) and high voltage DC (HVDC) networks has led to an emphasis on the growth of network protection elements such as DC circuit breakers (DCCB). Various structures have been proposed as DCCB, and one of the common structures is hybrid DC circuit breakers (HDCCB). Among HDCCB structures, the current commutation drive circuit (CCDC) structure has received more attention due to its low pre-fault losses. The CCDC has two coils with magnetic coupling. One is placed on the network side after the mechanical switch (MS), and the other is connected to a pre-charged capacitor through a silicon-controlled rectifier (SCR). The fixed capacitance of the capacitor and its predetermined voltage limits the CCDC operation in different peaks of fault currents. The peak fault current's growth increases the probability of failure in reaching zero crossing (ZC) in the fault current during the commutation. Conversely, with a decrease in the peak fault current, the commutation time increases, or the commutation fails. In this paper, a series and parallel capacitor array is presented to improve the performance of the CCDC. In the proposed method, according to the range of the network fault current increase rate, the capacitor's lowest capacitance and voltage will be set for the commutation of the lowest peak fault current and the highest capacitance and voltage for the highest peak fault current. The appropriate performance of the proposed enhanced CCDC in the DC network is evaluated using finite element (FE) simulations.