Abstract:This paper presents a novel space vector modulation (SVM) strategy based on vector space decomposition (VSD) for neutral point clamped (NPC) three-level six-phase inverter,which could be used in medium-voltage high-power AC electric drives.The principle is given as follows.The six-dimensional variables are decoupled and mapped into three two-dimensional spaces,namely the α-β space,the x-y space and the o1-o2 space.A vector simplified principle is proposed to reduce the number of the original vector from 729 to 417.Then the optimal five vectors (OFV) technique is designed to eliminate harmonic voltage in the x-y space.Meanwhile,the method of the region projection is proposed to improve thejudgment efficiency of the voltage reference vector in the complex region.The optimal vector operational order,by using the redundant negative vector as the first operation vector,balances the neutral point voltage effectively.Finally,the experimental resultsare given to verify the above mentioned theoretical developments.
陈健, 王政, 程明. 一种基于矢量空间解耦的三电平六相逆变器空间矢量调制策略[J]. 电工技术学报, 2016, 31(9): 101-111.
Chen Jian, Wang Zheng, Cheng Ming. Design of a Space Vector Modulation Strategy Based on Vector Space Decomposition for Three-Level Six-Phase Inverters. Transactions of China Electrotechnical Society, 2016, 31(9): 101-111.
[1] Alger P L,Freiburghouse E H,Chase D D.Double windings for turbine alternators[J].Transactions of the American Institute of Electrical Engineers,1930,49(1):226-244. [2] Zhao Y,Lipo T A.Space vector PWM control of dual three-phase induction machine using vector space decomposition[J].IEEE Transactions on Industry Applications,1995,31(5):1100-1109. [3] Fu J R,Lipo T A.Disturbance-free operation of a multiphase current-regulated motor drive with an opened phase[J].IEEE Transactions on Industry Applications,1994,30(5):1267-1274. [4] Bojoi R,Farina F,Griva G,et al.Direct torque control for dual three-phase induction motor drives[J].IEEE Transactions on Industry Applications,2005,41(4):1627-1636. [5] 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. [6] Rodriguez J,Bernet S,Steimer P K,et al.A survey on neutral point clamped inverters[J].IEEE Transactions on Industrial Electronics,2010,57(7):2219-2230. [7] 李先祥,肖红军,黄道平.三电平矢量控制的永磁同步伺服电动机调速系统[J].电工技术学报,2004,19(4):28-32. Li Xianxiang,Xiao Hongjun,Huang Daoping.Permanent magnet synchronous motor control system based on three-level vector control[J].Transactions of China Electrotechnical Society,2004,19(4):28-32. [8] 张颖超,赵争鸣,袁立强,等.固定开关频率三电平PWM整流器直接功率控制[J].电工技术学报,2008,23(5):62-68. Zhang Yingchao,Zhao Zhengming,Yuan Liqiang,et al.Direct power control with constant switching frequency for three-level PWM Rectifier[J].Transactions of China Electrotechnical Society,2008,23(5):62-68. [9] 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 andits junction temperature balancing control[J].Transactions of China Electrotechnical Society,2012,27(2):97-102. [10]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. [11]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 basedon the VSC-HVDC embedded in energy storage apparatus[J].Power System Protection and Control,2014,42(4):1-7. [12]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,2014,42(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,2014,42(15):1-7. [13]Levi E.Multiphase electric machines for variablespeed applications[J].IEEE Transactions on Industrial Electronics,2008,55(5):1893-1909. [14]Gao Liliang,Fletcher J E.A space vector switching strategy for three-level five-phase inverter drives[J].IEEE Transactions on Industrial Electronics,2010,57(7):2332-2343. [15]Dordevic O,Levi E,Jones M.A vector space decomposition based space vector PWM algorithm for a three-level seven-phase voltage source inverter[J].IEEE Transactions on Power Electronics,2013,28(2):637-649. [16]姚文熙,胡海兵,徐海杰,等.三电平六相同步电机变频调速技术研究[J].中国电机工程学报,2007,27(18):1-6. Yao Wenxi,Hu Haibing,Xu Haijie,et al.Research on techniques of three-level six-phase synchronous motor driver[J].Proceedings of the CSEE,2007,27(18):1-6. [17]Bojoi R,Lazzari M,Profumo F,et al.Digital field-oriented control for dual three-phase induction motor drives[J].IEEE Transactions on Industry Applications,2003,39(3):752-760. [18]Celanovic N,Boroyevich D.A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters[J].IEEE Transactions on Power Electronics,2000,15(2):242-249.