选择性谐波消除法在多电平逆变器故障调制中的应用
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摘要
随着多电平逆变器应用的增多,其开关故障运行控制问题也尤为突出。将选择性谐波消除法SHE(selective harmonic elimination)应用到多电平逆变器的容错控制中,提出一种提高系统可靠性的新型方法。利用SHE方法通过只屏蔽故障单元,不降低非故障相逆变器的容量进行容错。原来的SHE方法只能修正电压幅值,通过改进SHE来修正相移角的容错控制方法,可以使逆变器输出均衡的线电压和负载电压。提出的SHE方法容错控制适用于多电平逆变器的不同拓扑结构,对逆变器的低次谐波消除效果较好,补偿谐波具有灵活性和实用性。仿真和实验结果验证了提出方案的有效性。
With the increasing applications of a multi-level inverter, the problem of switching fault control is particularly obvious. In this paper, a selective harmonic elimination(SHE) method is applied to the fault-tolerant control of the multilevel inverter, and a novel method is proposed to improve the system reliability. The SHE method is utilized to realize fault-tolerance by only shielding fault cells instead of reducing the capacities of non-fault-phase inverters. The original SHE method can only correct the voltage amplitude; in comparison, by using the fault-tolerant control method proposed in this paper, in which SHE is improved to correct the phase shift angle, the inverter can output line voltage and load voltage in a balanced manner. This method is applicable to different topologies of multi-level inverters, and it has a satisfying effect on specific sub-harmonics, indicating that its harmonic compensation is flexible and practical.Simulation and experimental results verified the effectiveness of the proposed scheme.
With the increasing applications of a multi-level inverter, the problem of switching fault control is particularly obvious. In this paper, a selective harmonic elimination(SHE) method is applied to the fault-tolerant control of the multilevel inverter, and a novel method is proposed to improve the system reliability. The SHE method is utilized to realize fault-tolerance by only shielding fault cells instead of reducing the capacities of non-fault-phase inverters. The original SHE method can only correct the voltage amplitude; in comparison, by using the fault-tolerant control method proposed in this paper, in which SHE is improved to correct the phase shift angle, the inverter can output line voltage and load voltage in a balanced manner. This method is applicable to different topologies of multi-level inverters, and it has a satisfying effect on specific sub-harmonics, indicating that its harmonic compensation is flexible and practical.Simulation and experimental results verified the effectiveness of the proposed scheme.
引文
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[13]袁庆庆,伍小杰,石祥龙,等.基于特定谐波消除的并网锁相环技术[J].中国电机工程学报,2013,33(36):34-40.Yuan Qingqing,Wu Xiaojie,Shi Xianglong,et al.Gridconnected phase locked loop based on selective harmonic elimination[J].Proceedings of the CSEE,2013,33(36):34-40(in Chinese).
[14]周明磊,游小杰,王琛琛,等.特定次谐波消除调制方式的谐波特性分析[J].电工技术学报,2013,28(9):11-20.Zhou Minglei,You Xiaojie,Wang Chenchen,et al.Harmonic analysis of selected harmonic elimination pulse width modulation[J].Transactions of China Electrotechnical Society,2013,28(9):11-20(in Chinese).
[2]夏华,李磊,薛媛媛,等.一种新型的混合级联多电平逆变器[J].电源学报,2013,11(5):37-41.Xia Hua,Li Lei,Xue Yuanyuan,et al.A new type of hybrid cascaded multilevel inverter[J].Journal of Power Supply,2013,11(5):37-41(in Chinese).
[3]徐宁,徐和义,黄海宏.三相级联多电平并联有源电力滤波器[J].电力系统及其自动化学报,2014,26(3):57-60.Xu Ning,Xu Heyi,Huang Haihong,et al.Three-phase cascaded multi-level shunt active power filter[J].Proceedings of the CSU-EPSA,2014,26(3):57-60(in Chinese).
[4]王秀丽,郭静丽,庞辉,等.模块化多电平换流器的结构可靠性分析[J].中国电机工程学报,2016,36(7):1908-1914.Wang Xiuli,Guo Jingli,Pang Hui,et al.Structural reliability analysis of modular multi-level converters[J].Proceedings of the CSEE,2016,36(7):1908-1914(in Chinese).
[5]王异凡.多模块并联APF关键技术研究[D].杭州:浙江大学,2015.Wang Yifan.Research on key techniques of multi-module shunt APF[D].hangzhou:Zhejiang University,2015(in Chinese).
[6]Parvin M,Hamid M,Reza A.Fault-tolerant operation of cascaded H-bridge inverter using one redundant cell[C]//2015 IEEE Power and Energy Conference at Illinois(PECI).Champaign,IL,USA,2015:1-5.
[7]杨晓冬,夏正龙,段文勇,等.级联型STATCOM容错控制策略研究[J].电力电子技术,2016,50(3):71-74.Yang Xiaodong,Xia Zhenglong,Duan Wenyong,et al.Research on fault-tolerant control strategy for cascaded STA-TCOM[J].Power Electronics,2016,50(3):71-74(in Chinese).
[8]申科,王建赜,班明飞,等.基于零序电压注入的模块化多电平变流器故障容错控制[J].电力系统自动化,2014,38(5):96-102.Shen Ke,Wang Jianji,Ban Mingfei,et al.Fault-tolerant control of modular multilevel converter based on zero sequence voltage injection[J].Automation of Electric Power Systems,2014,38(5):96-102(in Chinese).
[9]王一军,张维,罗朝旭,等.混合型APF的选择性谐波补偿控制策略研究[J].电力电子技术,2015,49(5):102-104.Wang Yijun,Zhang Wei,Luo Zhaoxu,et al.Study of selective harmonic compensation control strategy for hybrid active power filter[J].Power Electronics,2015,49(5):102-104(in Chinese).
[10]刘景晖,郑益慧,姚钢,等.自适应特征谐波消除策略的并网逆变器电流跟踪优化方法[J].电工技术学报,2013,28(9):120-128.Liu Jinghui,Zheng Yihui,Yao Gang,et al.Optimized current tracking method for grid-connected inverter with adaptive characteristic harmonic elimination[J].Transactions of China Electrotechnical Society,2013,28(9):120-128(in Chinese).
[11]都小利,费万民.多电平逆变器半周期对称SHEPWM方法[J].电工技术学报,2010,25(4):95-102.Du Xiaoli,Fei Wanmin.Half-cycle symmetry SHEPWMmethod for multi-level voltage inverters[J].Transaction of China Electrotechnical Society,2010,25(4):95-102(in Chinese).
[12]叶满园,黎冰,李宋.基于Walsh函数的多电平逆变器多波段SHEPWM控制技术[J].电网技术,2013,37(10):2945-2952.Ye Manyuan,Li Bing,Li Song.Study on walsh function based multi-band SHEPWM control technology for multilevel inverter[J].Power System Technology,2013,37(10):2945-2952.
[13]袁庆庆,伍小杰,石祥龙,等.基于特定谐波消除的并网锁相环技术[J].中国电机工程学报,2013,33(36):34-40.Yuan Qingqing,Wu Xiaojie,Shi Xianglong,et al.Gridconnected phase locked loop based on selective harmonic elimination[J].Proceedings of the CSEE,2013,33(36):34-40(in Chinese).
[14]周明磊,游小杰,王琛琛,等.特定次谐波消除调制方式的谐波特性分析[J].电工技术学报,2013,28(9):11-20.Zhou Minglei,You Xiaojie,Wang Chenchen,et al.Harmonic analysis of selected harmonic elimination pulse width modulation[J].Transactions of China Electrotechnical Society,2013,28(9):11-20(in Chinese).
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