作者：黄全振1,2, 郭新军1, 张洋1,3, 黄明明1
作者单位：1. 河南工程学院电气信息工程学院，河南 郑州 451191;
2. 河南省电子陶瓷材料与应用重点实验室，河南 郑州 451191;
3. 国网河南省电力公司电力科学研究院，河南 郑州 450052
关键词：多电平变流器;均匀载波移相;开关次谐波;谐波抑制
摘要：
针对级联多电平拓扑，理论分析各单元直流侧电压不均衡时采用传统载波移相方法较难消除开关谐波的问题。对比调整调制波幅值、调制波相位和三角载波相位3种解决方案，指出调整三角载波相位的非均匀载波移相方法能够更加有效消除开关次谐波，并对级联单元为奇数和偶数的情况分别得出非均匀载波移相方法能够消除开关次谐波的频率上限。通过牛顿迭代法得出非均匀载波移相方法中移相角度计算方法，并给出工程实现方法。搭建的仿真和实验平台可验证直流电压不均衡时级联多电平拓扑下的开关次谐波问题，并证明非均匀载波移相方法的有效性。
Research of inhomogeneous carrier phase shifting method for cascaded multilevel converters
HUANG Quanzhen1,2, GUO Xinjun1, ZHANG Yang1,3, HUANG Mingming1
1. School of Electrical Information Engineering, Henan University of Engineering, Zhengzhou 451191, China;
2. Henan Province Key Laboratory of Electronic Ceramic Materials and Application, Zhengzhou 451191, China;
3. Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China
Abstract: For cascaded multilevel topology, the problem that switching harmonics is difficult to be eliminated by using traditional carrier phase-shifting method when the DC side voltage of each unit is unbalanced is analyzed theoretically. Three solutions of adjusting amplitude, phase and triangular carrier phase are compared in this paper. It is pointed out that the non-uniform carrier phase-shifting method with triangular carrier phase adjustment can eliminate the switching harmonics more effectively, and the upper frequency limits of the non-uniform carrier phase-shifting method to eliminate the switching harmonics are obtained respectively for the odd and even cascaded units. The calculation method of phase shift angle in non-uniform carrier phase-shifting method is obtained by Newton iteration method, and the engineering implementation method is also given. The simulation and experimental platforms are built to verify the switching sub-harmonic problem under cascaded multilevel topology when the DC voltage is unbalanced, and the effectiveness of the non-uniform carrier phase-shifting method is proved.
Keywords: multilevel converter;inhomogeneous carrier phase shifting;switching sub-harmonics;harmonic suppression
2021, 47(8):89-95 收稿日期: 2021-02-24;收到修改稿日期: 2021-03-29
基金项目: 国家自然科学基金（U1804162，62173126）；河南省高校科技创新团队支持计划（21IRTSTHN017）；河南省科技厅科技攻关项目（192102210072，212102210014）；河南工程学院科研培育基金项目（PYXM202014）
作者简介: 黄全振(1979-),男,河南郑州市人,副教授,博士,研究方向为先进智能控制、智能电网技术等
参考文献
[1] 陈素霞, 李娜娜, 黄全振, 等. 并联变流器变压器侧高频谐波抑制与移相角计算[J]. 中国测试, 2020, 46(10): 118-123
[2] 陈仲, 许亚明, 那显龙, 等. 级联型多电平逆变器输出电压循环分配的功率均衡控制及优化[J]. 中国电机工程学报, 2018, 38(4): 1132-1142
[3] 章勇高, 熊健. 级联多电平H桥逆变器的同相层叠型SPWM脉冲分配方法[J]. 电力自动化设备, 2017, 37(7): 148-154
[4] 杨俊杰, 谢维成, 曹倩. 级联H桥逆变器的多特征融合CNN故障诊断[J]. 中国测试, 2020, 46(7): 8-17
[5] HOLMES D G, LIPO T A. Pulse width modulation for power converters[M]. New Jersey: John Wiley & Sons Inc, 2003.
[6] AQUILA A D,LISERRE M,MONOPOLI V G, et al. Overview of PI-based solutions for the control of DC buses of a single-phase H-bridge multilevel active rectifier[J]. Industry Applications, IEEE Transactions on, 2008, 44(3): 857-866
[7] 李宋, 叶满园. 混合级联多电平逆变器混合频率载波调制技术[J]. 高电压技术, 2015, 41(7): 2378-2383
[8] MON-NZONGO D L, 沈学宇, 魏海斌, 等. 不对称电压下基于NPC拓扑并网逆变器的模型预测控制研究[J]. 中国测试, 2019, 45(2): 139-144
[9] 戴珂, 徐晨, 丁玉峰, 等. 载波轮换调制在级联H桥型STATCOM中的应用[J]. 中国电机工程学报, 2013, 33(12): 99-106
[10] 白志红, 周玉虎. 模块化多电平换流器的载波层叠脉宽调制策略分析与改进[J]. 电力系统自动化, 2018, 42(21): 139-144
[11] TOLBERT L M,CHIASSON J N,ZHONG D, et al. Elimination of harmonics in a multilevel converter with nonequal DC sources[J]. Industry Applications, IEEE Transactions on, 2005, 41(1): 75-82
[12] LISERRE M，MONOPOLI V G，DELL'AQUILA A, et al. Multilevel phase-shifting carrier PWM technique in case of non-equal DC-Link voltages[C]//32nd Annual Conference on IEEE Industrial Electronics, 2006.
[13] 陈仲, 许亚明, 刘亚云, 等. 一种适用于混合级联多电平逆变器的LS-PWM方法[J]. 中国电机工程学报, 2016, 36(23): 6490-6500
[14] 叶满园, 肖云煌, 康翔, 等. 混合H桥级联多电平逆变器功率均衡控制方法[J]. 电机与控制学报, 2018, 22(12): 54-61
[15] 陈仲, 许亚明, 袁涛. 一种基于载波层叠脉宽调制的倍频调制方法[J]. 电工技术学报, 2018, 33(10): 2334-2344
[16] BUTICCHI G,BARATER D,LORENZANI E, et al. A nine-level grid-connected converter topology for single phase transformerless PV systems[J]. Industrial Electronics, IEEE Transactions on, 2014, 61(8): 3951-3960
