中压模块化多电平换流器降低开关频率的锯齿载波最近电平-脉宽调制方法

doi:10.19595/j.cnki.1000-6753.tces.190182

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (61432 KB) HTML
输出: BibTeX | EndNote (RIS)

摘要最近电平-脉宽调制（NL-PWM）适用于中压模块化多电平换流器（MMC）,较最近电平调制（NLM）可大幅减少谐波电流。NL-PWM通过电压排序实现桥臂子模块均压,均压切换设置在阶梯波跳变点,可减少额外的开关切换,但也限制了均压频率,影响了均压效果。PWM开关频率较高,在其开关点进行均压切换可大幅提高均压频率。现有NL-PWM方法基于三角载波,其开关点随参考电压变化,不便于均压控制的实施。该文提出非倍频和倍频的基于锯齿载波的NL-PWM方法,锯齿载波具有固定的跳变点便于均压控制。分析了所提调制的谐波特性,研究表明,采用倍频锯齿载波NL-PWM方法可在降低开关频率的同时保证良好的均压效果与输出电能质量。此外,所提调制亦可避免功率开关的窄脉冲。仿真与实验研究验证了理论分析的正确性。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	张雪垠
	徐永海
	李卫国
	肖湘宁

关键词 ：中压模块化多电平换流器, 最近电平-脉宽调制, 锯齿载波, 开关频率, 窄脉冲

Abstract：The nearest level pulse width modulation (NL-PWM) is suitable for the medium voltage modular multilevel converters (MMCs), which can greatly reduce the current distortion compared with the nearest level modulation (NLM). The NL-PWM achieves bridge-arm sub-module voltage balancing by the sorting algorithm. The implementation of the voltage-balancing rotating at each edge of the stair wave can reduce extra switching, but it also limits the balancing frequency and consequently affects the balancing effect. Since the switching frequency of PWM is relatively high, conducting the voltage-balancing rotating at the edges of PWM wave can greatly increase the balancing frequency. The state-of-the-art NL-PWM is based on triangle carrier, and its switching point varies with the reference voltage, which is not convenient for the implementation of the voltage-balancing control. In this paper, a non-frequency-doubling and a frequency-doubling NL-PWM methods based on sawtooth-carrier are proposed. The sawtooth wave has fixed edges to facilitate the voltage-balancing control. The hormonic characteristics of the proposed modulations are analyzed. It is shown that the frequency-doubling sawtooth-carrier based NL-PWM method can ensure both good voltage-balancing effect and output power quality while reducing the switching frequency. Besides, the proposed modulation can also avoid narrow pulse of power switches. Simulation and experiments verify the correctness of the theoretical analysis.

Key words： Medium voltage modular multilevel converter nearest level pulse width modulation (NL-PWM) sawtooth carrier switching frequency narrow pulse

收稿日期: 2019-02-23 出版日期: 2020-04-24

PACS:

TM46

基金资助:北京市自然科学基金项目（3172036）和新能源电力系统国家重点实验室（华北电力大学）自主研究课题（LAPS2019-20）资助

通讯作者: 张雪垠男,1992年生,博士研究生,研究方向为多电平换流器和电力电子变压器等。E-mail: elec_zhang@foxmail.com

作者简介: 徐永海男,1966年生,博士,教授,博士生导师,研究方向为电能质量分析与控制技术、电力电子变压器和新能源电力系统等。E-mail: yonghaixu@263.net

引用本文:

张雪垠, 徐永海, 李卫国, 肖湘宁. 中压模块化多电平换流器降低开关频率的锯齿载波最近电平-脉宽调制方法[J]. 电工技术学报, 2020, 35(8): 1716-1727. Zhang Xueyin, Xu Yonghai, Li Weiguo, Xiao Xiangning. A Reduced-Switching Frequency NL-PWM Method Based on Sawtooth Carrier for Medium Voltage Modular Multilevel Converter. Transactions of China Electrotechnical Society, 2020, 35(8): 1716-1727.

链接本文:

https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190182 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I8/1716

[1] Lesnicar A, Marquardt R.An innovative modular multilevel converter topology suitable for a wide power range[C]//IEEE Power Technology Conference, Bologna, Italy, 2003: 1-6.
[2] 尹太元, 王跃, 段国朝, 等. 基于零直流电压控制的混合型MMC-HVDC直流短路故障穿越策略[J]. 电工技术学报, 2019, 34(增刊1): 343-351.
Yin Taiyuan, Wang Yue, Duan Guochao, et al.Zero DC voltage control based DC fault ride-through strategy for hybrid modular multilevel converter in HVDC[J]. Transactions of China Electrotechnical Society, 2019, 34(S1): 343-351.
[3] 王一凡, 赵成勇, 郭春义. 双馈风电场孤岛经模块化多电平换流器直流输电并网系统小信号稳定性分析与振荡抑制方法[J]. 电工技术学报, 2019, 34(10): 2116-2129.
Wang Yifan, Zhao Chengyong, Guo Chunyi.Small signal stability and oscillation suppression method for islanded double fed induction generator-based wind farm integrated by modular multilevel converter based HVDC system[J]. Transactions of China Electrotechnical Society, 2019, 34(10): 2116-2129.
[4] 李子欣, 王平, 楚遵方, 等. 面向中高压智能配电网的电力电子变压器研究[J]. 电网技术, 2013, 37(9): 2592-2601.
Li Zixin, Wang Ping, Chu Zunfang, et al.Research on medium- and high-voltage smart distribution grid oriented power electronic transformer[J]. Power System Technology, 2013, 37(9): 2592-2601.
[5] Briz F, López M, Rodríguez A, et al.MMC based SST[C]//IEEE 13th International Conference on Industrial Informatics (INDIN), Cambridge, 2015: 1591-1598.
[6] Pacheco J, Honório D, Oliveira D.An AC-DC isolated MMC-based structure suitable for MV SST traction applications[J]. IEEE Access, 2019, 7: 106395-106406.
[7] Jing L, Xu Cai, Molinas M.Optimal design of controller parameters for improving the stability of MMC-HVDC for wind farm integration[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6(1): 40-53.
[8] 赵争鸣, 冯高辉, 袁立强, 等. 电能路由器的发展及其关键技术[J]. 中国电机工程学报, 2017, 37(13): 3823-3834.
Zhao Zhengming, Feng Gaohui, Yuan Liqiang, et al.The development and key technologies of electric energy router[J]. Proceedings of the CSEE, 2017, 37(13): 3823-3834.
[9] Hu Pengfei, Jiang Daozhuo.A level-increased nearest level modulation method for modular multilevel converters[J]. IEEE Transactions on Power Electro- nics, 2015, 30(4): 1836-1842.
[10] Wang Kun, Deng Yan, Peng Hao, et al.An improved CPS-PWM scheme-based voltage balancing strategy for MMC with fundamental frequency sorting algorithm[J]. IEEE Transactions on Industrial Elec- tronics, 2019, 66(3): 2387-2397.
[11] 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.
Bai Zhihong, Zhou Yuhu.Analysis and improvement on carrier level-shifted pulse width modulation strategy for modular multilevel converter[J]. Auto- mation of Electric Power Systems, 2018, 42(21): 139-144.
[12] Deng Yi, Wang Yebin, Teo K H, et al.Optimized control of the modular multilevel converter based on space vector modulation[J]. IEEE Transactions on Power Electronics, 2018, 33(7): 5697-5711.
[13] Wang Yi, Hu Can, Ding Ruoyu, et al.A nearest level PWM method for the MMC in DC distribution grids[J]. IEEE Transactions on Power Electronics, 2018, 33(11): 9209-9218.
[14] Choi J, Han B, Kim H.New scheme of phase-shifted carrier PWM for modular multilevel converter with redundancy submodules[J]. IEEE Transactions on Power Delivery, 2016, 31(1): 407-409.
[15] Tariq M, Meraj M, Azeem A, et al.Evaluation of level-shifted and phase-shifted PWM schemes for seven level single-phase packed U cell inverter[J]. CPSS Transactions on Power Electronics and Applications, 2018, 3(3): 232-242.
[16] Deng Yi, Harley R G.Space-vector versus nearest- level pulse width modulation for multilevel con- verters[J]. IEEE Transactions on Power Electronics, 2015, 30(6): 2962-2974.
[17] Lin Lei, Lin Yizhe, He Zhen, et al.Improved nearest-level modulation for a modular multilevel converter with a lower submodule number[J]. IEEE Transactions on Power Electronics, 2016, 31(8): 5369-5377.
[18] 苟锐锋, 赵方舟, 肖国春, 等. 基于修正优化归并排序的MMC电容均压策略[J]. 中国电机工程学报, 2017, 37(1): 251-261.
Gou Ruifeng, Zhao Fangzhou, Xiao Guochun, et al.A capacitor voltage balancing strategy for MMC based on optimized merge sort[J]. Proceedings of the CSEE, 2017, 37(1): 251-261.
[19] Li Yufei, Wang Yue, Li Q Ben.Generalized theory of phase-shifted carrier PWM for cascaded H-bridge converters and modular multilevel converters[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2016, 4(2): 589-605.
[20] Hagiwara M, Maeda R, Akagi H.Control and analysis of the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC)[J]. IEEE Transactions on Power Electronics, 2011, 26(6): 1649-1658.
[21] 李敏裕, 马晓军, 魏曙光, 等. 三电平虚拟空间矢量脉宽调制算法窄脉冲抑制研究[J]. 电工技术学报, 2018, 33(14): 3264-3273.
Li Minyu, Ma Xiaojun, Wei Shuguang, et al.Research on narrow pulse suppression of three-level virtual space vector pulse width modulation algorithm[J]. Transactions of China Electrotechnical Society, 2018, 33(14): 3264-3273.