In wind turbine generation (WTG) systems, a backto-back converter with a neutral-point-clamped (NPC) topology is widely used
because this topology has more advantages than a conventional two-level topology, particularly when operating at high power.
There are 12 switches in the NPC topology. An open-switch fault in the NPC rectifier of the back-to-back converter leads to the
distortion of the input current and torque vibration in the system. Additionally, an open-switch fault in the NPC inverter of the back-
to-back converter causes the distortion of the output current. Furthermore, the WTG system can break down in the worst case
scenario. To improve the reliability of WTG systems, an open-switch fault detection method for back-to-back converters using the
NPC topology is required. This study analyzes effects of inner and outer open-switch faults of the NPC rectifier and inverter and
describes a novel open-switch fault detection method for all possible open-switch faults in the back-to-back converter.
- 76.pdf (2.5M) 11회 다운로드 | DATE : 2019-06-30 15:23:07