Abstract：Traditional neutral point clamped (NPC) three-level converter has a drawback of unbalanced junction temperatures among the power devices, which severely limits the converter’s capacity. While the Active NPC (ANPC) three-level has the potential to overcome this drawback and obtanins an even distribution of junction temperatures. In this paper, the switching states and commutations of ANPC are analyzed, and the loss and heat dissipation model of power devices are given as well. Furthermore, two pulse width modulation (PWM) strategies of ANPC are introduced, based on which a novel junction temperature balancing control method is proposed. Experimental results demonstrate that the proposed method could adjust the operating proportion dynamically between PWM type 1 and type 2 under different modulation indexes, and thus the balanced junction temperatures can be achieved. Compared to NPC three-level converter, ANPC has the ability to raise its capacity of 23.1% and 33.3% respectively under inverter and rectifier operation modes. So the ANPC three-level converters are more competitive for engineering applications.
谭国俊, 景巍. 有源钳位三电平变频器及其结温平衡控制[J]. 电工技术学报, 2012, 27(2): 97-102.
Tan Guojun, Jing Wei. Active Neutral Point Clamped Three-Level Converter and Its Junction Temperature Balancing Control. Transactions of China Electrotechnical Society, 2012, 27(2): 97-102.
[1] AbuRub H, Holtz J, Rodriguez J, et al. Medium-voltage multilevel converters-state of the art, challenges, and requirements in industrial applications[J]. IEEE Transactions on Industrial Electronics, 2010, 57(8): 2581-2596. [2] 绳伟辉, 李崇坚, 朱春毅, 等. 大功率IGCT三电平变流器空间矢量PWM调制算法[J], 电工技术学报, 2007, 22(8): 1-6. [3] 陈鑫兵, 何礼高. 基于模糊控制的三电平逆变器中点电位平衡策略[J]. 电工技术学报, 2007, 22(10): 103-108. [4] 汪鋆, 杨兵建, 徐枝新, 等. 750kVA 高功率密度二极管钳位型三电平通用变流模块的低感层叠母排设计[J]. 中国电机工程学报. 2010, 30(18): 47-54. [5] 钟玉林, 赵争鸣. 改进式SHEPWM 对三电平变频器系统的共模电压和轴电压的抑制作用[J], 电工技术学报, 2009, 24(6): 48-55. [6] 姚文熙, 王斯然, 刘森森, 等. 三电平空间矢量调制中的共模分量[J], 电工技术学报, 2009, 24(4): 108-113. [7] Bruckner T, Bernet S. Loss balancing in three-level voltage source inverters applying active NPC switches[C]. Proceedings of the IEEE Power Electronics Specialist Conference, 2001: 1135-1140. [8] Bruckner T, Bernet S, Guldner H. The active NPC converter and its loss-balancing control[J]. IEEE Transactions on Industrial Electronics, 2005, 52(3): 855-868. [9] Bruckner T, Bernet S, Steimer P K. Feedforward loss control of three-level active NPC converters[J]. IEEE Transactions on Industrial Applications, 2007, 43(6): 1588-1596. [10] Florucau D, Floricau E, Gateau G. Three-level active NPC converter: PWM strategies and loss distribution [C]. Proceedings of the 34th IEEE Annual Conference of Industrial Electronics Society, 2008: 3333-3338. [11] 胡建辉, 李锦庚, 邹继斌, 等. 变频器中IGBT模块损耗计算及散热系统设计[J]. 电工技术学报. 2009, 24(3): 159-163. [12] Hu Jianghui, Li Jingeng, Zou Jibin, et al. Losses calculation of IGBT module and heat dissipation system design of inverters[J]. Transactions of Chinese Electrotechnical Society, 2009, 24(3): 159-163.
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