Open AccessOpen‐circuit fault diagnosis for a fault‐tolerant three‐level neutral‐point‐clamped STATCOM
Author(s) -
Li Haoyang,
Guo Yuanbo,
Xia Jinhui,
Li Ze,
Zhang Xiaohua
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5802
Subject(s) - robustness (evolution) , control theory (sociology) , fault (geology) , fault indicator , short circuit , stuck at fault , electronic circuit , fault current limiter , point (geometry) , computer science , engineering , electronic engineering , fault detection and isolation , voltage , electric power system , power (physics) , mathematics , electrical engineering , control (management) , artificial intelligence , geometry , actuator , chemistry , biochemistry , quantum mechanics , physics , seismology , gene , geology
This study presents an open‐circuit fault diagnosis method for a fault‐tolerant three‐level neutral‐point‐clamped static synchronous compensator (STATCOM). Since STATCOM only outputs reactive current, misdiagnosis may occur by utilising conventional methods. The proposed method relies on the measurement of three‐phase currents and is able to identify the faulty switch within 10 ms. The diagnosis method uses the residuals of three‐phase currents to detect the faults and locate the faulty switch pair. In addition, the root‐mean‐square value of the faulty phase current for a quarter of the current period is used to identify the faulty switch. Only the sensors that already exist in the system are required for the diagnosis method, which avoids the use of additional hardware circuits. Experimental results demonstrate the effectiveness and robustness of the proposed fault diagnosis strategy.