Abstract：Based on the fault reconstruction and tolerant control strategy,the model of the NPC three-level inverter is built. Then the equivalent circuit under the synchronous rotating coordinate system is proposed.The mechanism of the fluctuation of the DC link capacitor voltage under both normal mode and two types of fault tolerant control modes are analyzed. A universal mitigation strategy dealing with the DC link capacitor voltage fluctuation is proposed afterwards. Finally,the experiments are carried out to verify the validity of the theoretical analysis of the DC link capacitor voltage fluctuation and its mitigation strategies under the fault tolerant control mode. The results show that the key to control the fluctuation of the DC link capacitor voltage under fault tolerant mode is to balance the equivalent parallel admittances by injecting the zero-sequence voltage.
张兵, 王政, 储凯, 程明. NPC型三电平逆变器容错控制模式下的母线电容电压波动分析及其抑制[J]. 电工技术学报, 2015, 30(7): 52-61.
Zhang Bing, Wang Zheng, Chu Kai, Cheng Ming. Analysis of Fluctuation in DC Link Capacitor Voltage of NPC Three-level Inverter and Its Mitigation under Fault Tolerant Control Mode. Transactions of China Electrotechnical Society, 2015, 30(7): 52-61.
[1] Nabae A,Takahashi I,Akagi H.A new neutral-point-clamped PWM inverter[J].IEEE Transactions on Industry Applications,1981,IA-17(5):518-523. [2] Enjeti P N,Jakkli R.Optimal power control strategies for neutral point clamped inverter topology[J].IEEE Transactions on Industry Applications,1992,28(3):558-566. [3] Steinke J K.Switching frequency optimal PWM control of a three-level inverter[J].IEEE Transactions on Power Electronics,1992,7(3):487-496. [4] Feng D W,Wu Bin,Wei Sanmin,et al.Space vector modulation for neutral point clamped multilevel inverter with even order harmonic elimination[C].Canadian Conference on Electrical and Computer Engineering,Canada,2004,3(3):1471-1475. [5] Bruckner T,Holmes D G.Optimal pulse-width modulation for three-level Inverters[J].IEEE Transactions on Power Electronics,2005,20(1):82-89. [6] 姜卫东,王群京,陈权,等.一种完全基于两电平空间矢量调制的三电平空间矢量调制算法[J].电工技术学报,2009,24(1):108-114. Jiang Weidong,Wang Qunjing,Chen Quan,et al.SVPWM strategy for three-level inverter based on svpwm strategy for two-level inverter[J].Transactions of China Electrotechnical Society,2009,24(1):108-114. [7] 陈权,王群京,姜卫东,等.二极管钳位型三电平变换器开关损耗分析[J].电工技术学报,2008,23(2):68-75. Chen Quan,Wang Qunjing,Jiang Weidong,et al.Analysis of switching losses in diode-clamped three-level converter[J].Transactions of China Electrotechnical Society,2008,23(2):68-75. [8] 张艳莉,费万民,吕征宇,等.三电平逆变器SHE PWM方法及其应用研究[J].电工技术学报,2004,19(1):16-20+54. Zhang Yanli,Fei Wanmin,Lü Zhengyu,et al.Research of selected harmonic elimination pwm tech niques applicable to three-level voltage inverters[J].Transactions of China Electrotechnical Society,2004,19(1):16-20+54. [9] 宋强,刘文华,严干贵,等.基于零序电压注入的三电平NPC逆变器中点电位平衡控制方法[J].中国电机工程学报,2004,24(7):57-62. Song Qiang,Liu Wenhua,Yan Gangui,et al.A neutral-point potential balancing algorithm for three-level npc inverters by using analytically injected zero-sequence voltage[J].Proceedings of the CSEE,2004,24(7):57-62. [10]翁海清,孙旭东,刘丛伟,等.三电平逆变器直流侧电压平衡控制方法的改进[J].中国电机工程学报,2002,22(9):94-97. Weng Haiqing,Sun Xudong,Liu Congwei,et al.Improvement on DC-voltage balance control method of three-level inverter[J].Proceedings of the CSEE,2002,22(9):94-97. [11]宋文祥,陈国呈,束满堂,等.中点钳位式三电平逆变器空间矢量调制及其中点控制研究[J].中国电机工程学报,2006,26(05):105-109. Song Wenxiang,Chen Guocheng,Shu Mantang,et al.Research on SVPWM method and its neutral-point-potential control for three-level neutral-point-clamped (NPC)inverter[J].Proceedings of the CSEE,2006,26(05):105-109. [12]解大,解蕾,张延迟,等.连接海上风电场的基于直接功率控制的三电平VSC-HVDC[J].电力系统保护与控制,2010,38(14):98-103+152. Xie Da,Xie Lei,Zhang Yanchi,et al.Three-level VSC-HVDC based on direct power control connecting offshore wind farm[J].Power System Protection and Control,2010,38(14):98-103,152. [13]饶成诚,王海云,王维庆,等.基于储能装置的柔性直流输电技术提高大规模风电系统稳定运行能力的研究[J].电力系统保护与控制,2014,42(4):1-7. Rao Chengcheng,Wang Haiyun,Wang Weiqing,et al.Enhancement of the stable operation ability of large-scale wind power system based on the VSC-HVDC embedded in energy storage apparatus[J].Power System Protection and Control,2014,42(4):1-7. [14]宋国兵,冉孟兵,靳幸福,等.利用零模电流的VSC-HVDC输电线路单端量保护原理研究[J].电力系统保护与控制,2014,(15):1-7. Song Guobing,Ran Mengbing,Jin Xingfu,et al.A novel protection method for vsc-hvdc transmission lines using single-end zero-mode current[J].Power System Protection and Control,2014,(15):1-7. [15]Jun Li,Huang A Q,Zhigang Liang,et al.Analysis and design of active NPC (ANPC) inverters for fault-tolerant operation of high-power electrical drives[J].IEEE Transactions on Power Electronics,2012,27(2):519-533. [16]Mirafzal B.Survey of fault-tolerance techniques for three-phase voltage source inverters[J].IEEE Transactions on Industrial Electronics,2014,61(10):5192-5202.
2015, Vol. 30 
