摘要
提出一种新型的串联混合三电平中点钳位（neutralpoint clamped,NPC）拓扑,该拓扑是基于传统三电平NPC拓扑的改进和优化,引入大功率IGBT的串联应用。该新型拓扑中,桥臂的两个外管分别用两个低压IGBT串联,两个内管均用高压IGBT。在多兆瓦级中压风电变流器中,大功率IGBT的开关损耗很大,从而限制了开关频率。提出的新型拓扑通过低压IGBT的串联来减小功率器件的损耗,从而提高开关频率,同时可减小输出滤波器的尺寸。通过传统三电平拓扑和新型串联混合三电平拓扑IGBT损耗的对比,说明新拓扑的优势。通过改变门极驱动电阻实现串联IGBT的均压,对新拓扑的应用具有重大意义。最后通过新拓扑的单相样机验证新拓扑的正确性和可行性。
With the increase of wind power converter＇ capacity, the medium voltage converter is applied to improve the converter＇s efficiency. Multi-level topology is widely applied in the medium voltage converter. In the medium voltage wind power converter, the IGBT＇s rated voltage and current are large. However, the high power and voltage IGBT＇s switching losses are large, which limits the switching frequency of the converter and the further improvement of converter＇s efficiency.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第9期I0007-I0007,共1页
Proceedings of the CSEE
基金
国家863高技术基金项目（2011AA05A104）.
关键词
电压转换器
拓扑结构
风力发电
中压
NPC
三电平
混合
串联
three-level neutral point clamped （NPC）
serial hybrid
voltage sharing
multi-MW
medium voltage wind power converter
