Method for positioning open-circuit fault of sub-module lower tube of modular multi-level power regulator

• Main Authors: WU LINYIN, YANG XI, TANG LINLIN, GE HONGYU, WEI KEZHANG, ZHU WEN, YUE CHUANDONG, CHEN YIZHAO, QIN FENG, WANG GUAN, MO XINGMIN, WANG HUI
• Format: Patent
• Language: Chinese; English
• Published: 06.01.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a modularized multi-level power regulator submodule lower tube open-circuit fault positioning method. The method comprises two steps of fault module pre-screening and fault module accurate positioning. According to the fault module pre-screening, possible fault sub-modules are preliminarily screened out according to the maximum voltage value of each fundamental wave period. And the fault module is positioned according to a given pulse signal and the change trend of the output voltage of the given pulse signal to finally determine the fault position. The fault positioning method is suitable for fault positioning of a rectification state with unobvious voltage change, and high-reliability operation of the modular multi-level power regulator is realized. 本发明公开了一种模块化多电平功率调节器子模块下管开路故障定位方法，包括故障模块预筛选和故障模块的准确定位两个步骤。故障模块预筛选根据各个基波周期的电压最大值初步筛选出可能的故障子模块。故障模块的定位依据给定脉冲信号及其输出电压的变化趋势最终确定故障位置。本发明故障定位方法，适用于电压变化不明显的整流状态的故障定位，实现了模块化多电平功率调节器的高可靠运行。