Open-Switch Fault Detection Method of a Back-to-Back Converter Using NPC Topology for Wind Turbine Systems
Open-Switch Fault Detection Method of a Back-to-Back Converter Using NPC Topology for Wind Turbine Systems
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DOI：
10.1109/tia.2014.2327151
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发表时间：
2015
影响因子：
4.4
通讯作者：
June-Seok Lee;Kyo-Beum Lee;F. Blaabjerg
中科院分区：
文献类型：
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作者：
June-Seok Lee;Kyo-Beum Lee;F. Blaabjerg
在风力涡轮机发电（WTG）系统中，具有中性点箝位（NPC）拓扑的背靠背变换器被广泛使用，因为该拓扑比传统的两电平拓扑具有更多的优点，特别是当在高功率下操作时。NPC拓扑中有12台交换机。背靠背变换器中NPC整流器的开关开路故障导致系统输入电流畸变和转矩振荡。另外，背靠背变换器的NPC逆变器中的开路开关故障导致输出电流的失真。此外，WTG系统可能在最坏的情况下发生故障。为了提高风力发电机系统的可靠性，需要一种基于NPC拓扑的背靠背变流器开路故障检测方法。分析了NPC整流器和逆变器内部和外部开路故障的影响，提出了一种适用于背靠背变换器所有可能开路故障的开路故障检测方法。
In wind turbine generation (WTG) systems, a back-to-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.