两相-单相非隔离电力电子变压器规避短路矢量的三维空间矢量脉宽调制策略

doi:10.19595/j.cnki.1000-6753.tces.240541

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Abstract Electrical isolation in advanced power supply systems typically relies on power frequency transformers or high-frequency isolation DC-DC converters. However, the transformers result in multiple converter stages and increase the system’s complexity and cost. To reduce the cost of advanced traction power supply system, this paper proposes a two-phase to single-phase non-isolated power electronic transformer (NI-PET) topology based on the existing traction transformer and has the advantages of fewer transformation stages and higher system efficiency.
Some switch states can result in short-circuit paths of the DC-link capacitance in NI-PET topology. The traditional modulation strategy fails to avoid the short-circuit paths. A three-dimensional space-vector pulse width modulation (3D-SVPWM) strategy is proposed based on the 3D space vector distribution diagram, taking the vectors of three ports as the coordinate axis. According to the number of available vectors, the 3D space is divided into different ranges. In addition, the proposed strategy determines the range of reference voltage vectors and selects available space vectors to complex the demanded reference vector. Finally, based on the V-v traction transformer, the simulation model and experimental platform are built.
Simulation and experimental results show that compared to the traditional space pulse width modulation (SPWM) strategy, the proposed modulation strategy can realize the stable operation of the system. When the load and grid-side voltage fluctuate repeatedly in a short period, the two-phase to single-phase NI-PET system restores a steady state within 0.2 s, the grid-side power factor remains above 0.99, and the THD of input and output current is less than 3%. With the same load, the three-phase current unbalance degree of the proposed topology is about 45% less than the traditional power supply system. It is verified that the proposed topology and modulation can adapt to harsh conditions such as continuous load and grid-side voltage fluctuations. Compared to PET, NI-PET avoids the loss caused by the isolation stage, thus significantly improving the efficiency. In the low-power experimental platform, the efficiency of NI-PET is about 10% higher than PET.
The following conclusions can be drawn. (1) The proposed two-phase to single-phase NI-PET topology can adapt to the harsh conditions of advanced traction power supply systems. It has the advantages of low cost and good power quality. (2) Compared to the traditional modulation strategy, the proposed one can avoid the short-circuit paths of DC-link capacitance. There is no short-circuit current that is much larger than the load current on the cascade line. (3) The proposed topology can achieve about 10% efficiency improvement in a low-power experimental platform and is expected to increase the efficiency by about 2% in industrial PET.

Key words： Non-isolated power electronic transformer two-phase to single-phase avoiding short-circuit vectors three-dimensional space vector pulse width modulation (3D-SVPWM) strategy

Received: 08 April 2024

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[1] 袁立强, 高深, 姬世奇, 等. 基于占空比同步的电力电子变压器低压交流端口模式切换控制[J]. 电工技术学报, 2022, 37(3): 729-738.
Yuan Liqiang, Gao Shen, Ji Shiqi, et al.Mode transition for low voltage AC port of power electronic transformers based on duty cycle synchronization[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 729-738.
[2] Zhang Jianwen, Li Hongming, Kong Xinyi, et al.A novel multiple-medium-AC-port power electronic transformer[J]. IEEE Transactions on Industrial Electronics, 2024, 71(7): 6568-6578.
[3] Wu Si, Wu Mingli, Li Linwei, et al.Analysis and comparison of MMC-based co-phase traction power supply topology for auto-transformer power supply system[J]. IEEE Transactions on Power Delivery, 2022, 37(5): 4053-4063.
[4] 胡钰杰, 李子欣, 罗龙, 等. 串联谐振间接矩阵型电力电子变压器高频电流特性分析及开关频率设计[J]. 电工技术学报, 2022, 37(6): 1442-1454.
Hu Yujie, Li Zixin, Luo Long, et al.Characteristic analysis of high-frequency-link current of series resonant indirect matrix type power electronics transformer and switching frequency design[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1442-1454.
[5] 卓超然, 张笑天, 张雄, 等. 支撑电容可分离的直流变压器短路故障电流限流控制方法[J]. 电工技术学报, 2022, 37(2): 424-432.
Zhuo Chaoran, Zhang Xiaotian, Zhang Xiong, et al.Short-circuit fault current limiting control method of DC transformer with separable supporting capa-citor[J]. Transactions of China Electrotechnical Society, 2022, 37(2): 424-432.
[6] Feng Moke, Gao Chenxiang, Xu Jianzhong, et al.Modeling for complex modular power electronic transformers using parallel computing[J]. IEEE Transactions on Industrial Electronics, 2023, 70(3): 2639-2651.
[7] Pan Yuzhuo, Teng Jiaxun, Yang Chen, et al.Capacitance minimization and constraint of CHB power electronic transformer based on switching synchronization hybrid phase-shift modulation method of high frequency link[J]. IEEE Transactions on Power Electronics, 2023, 38(5): 6224-6242.
[8] 程启明, 程尹曼, 张磊, 等. 基于干扰观测器的MMC-PET交直流混合微电网并网/离网切换控制策略[J]. 高电压技术, 2024, 50(3): 1196-1204.
Cheng Qiming, Cheng Yinman, Zhang Lei, et al.Switching control strategy of MMC-PET AC/DC hybrid microgrid on/off grid based on disturbance observer[J]. High Voltage Engineering, 2024, 50(3): 1196-1204.
[9] 赵志刚, 贾慧杰, 刘朝阳, 等. 考虑PWM波形特征的纳米晶磁心损耗模型的研究及验证[J]. 电工技术学报, 2024, 39(6): 1602-1612.
Zhao Zhigang, Jia Huijie, Liu Chaoyang, et al.Research and verification of nanocrystalline core loss model considering PWM waveform characteristics[J]. Transactions of China Electrotechnical Society, 2024, 39(6): 1602-1612.
[10] 赵楠, 郑泽东, 刘建伟, 等. 级联H桥变换器IGBT开路故障分析与冗余方法研究[J]. 电工技术学报, 2023, 38(6): 1608-1619.
Zhao Nan, Zheng Zedong, Liu Jianwei, et al.IGBT open-circuit fault analysis and fault-tolerant method for cascaded H-bridge converter[J]. Transactions of China Electrotechnical Society, 2023, 38(6): 1608-1619.
[11] 徐翊宸, 杨双寿, 王悦, 等. 单相级联整流器开路故障诊断和容错均压空间矢量脉宽调制算法[J]. 电工技术学报, 2024, 39(14): 4432-4444.
Xu Yichen, Yang Shuangshou, Wang Yue, et al.Open-circuit fault diagnosis and fault-tolerant voltage balancing space vector pulse width modulation algo-rithm of single-phase cascaded rectifier[J]. Transa-ctions of China Electrotechnical Society, 2024, 39(14): 4432-4444.
[12] 陈润田, 李楚杉, 姚文熙, 等. 基于等效励磁电感的SiC串联器件型中压双有源桥变换器的软开关技术[J]. 电工技术学报, 2024, 39(12): 3732-3745.
Chen Runtian, Li Chushan, Yao Wenxi, et al.Soft-switching technique for medium voltage dual active bridge converter with series-connected SiC devices based on equivalent magnetizing inductance[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 3732-3745.
[13] 刘建强, 赵楠, 孙帮成, 等. 基于LLC谐振变换器的电力电子牵引变压器控制策略研究[J]. 电工技术学报, 2019, 34(16): 3333-3344.
Liu Jianqiang, Zhao Nan, Sun Bangcheng, et al.Research on control strategy of power electronic traction transformer based on LLC resonant con-verter[J]. Transactions of China Electrotechnical Society, 2019, 34(16): 3333-3344.
[14] 陈子怡, 涂春鸣, 王鑫, 等. 高频隔离型两相-单相贯通牵引供电装置及其控制策略[J/OL]. 中国电机工程学报, 2024. https://doi.org/10.13334/j.0258-8013.pcsee.231536.
Chen Ziyi, Tu Chunming, Wang Xin, et al. A high frequency isolated two-phase to single-phase advanced traction power supply device and its control strategy[J/OL]. Proceedings of the CSEE, 2024, https://doi.org/10.13334j.0258-8013.pcsee.231536.
[15] 孟令辉, 周犹松, 闫晗, 等. 应用于贯通供电系统的两相-单相变换器直流电压纹波特性与功率均衡控制[J]. 中国电机工程学报, 2022, 42(17): 6449-6460.
Meng Linghui, Zhou Yousong, Yan Han, et al.DC-link voltage ripple analysis and power balanced control for two-phase to single-phase converter in advanced traction power supply system[J]. Pro-ceedings of the CSEE, 2022, 42(17): 6449-6460.
[16] Asoodar M, Iman-Eini H.A new switching algorithm in back to back CHB multilevel converters with the advantage of eliminating isolation stage[C]//2012 11th International Conference on Environment and Electrical Engineering, Venice, Italy, 2012: 731-736.
[17] Miranbeigi M, Iman-Eini H, Asoodar M.A new switching strategy for transformer-less back-to-back cascaded H-bridge multilevel converter[J]. IET Power Electronics, 2014, 7(7): 1868-1877.
[18] Bacheti G G, Camargo R S, Bueno E J, et al.A sectorized FCS-MPC transformer less SST for power transmission application[C]//European Conference on Power Electronics and Applications (EPE'22 ECCE Europe), Hanover Germany, 2022: 1-11.
[19] Zeng Li, Han Pengcheng, Huang Tongyue, et al.Bidirectional-friendly rectifier control strategy for advanced traction power supply system under unbalanced supply[J]. Journal of Power Electronics, 2022, 22(5): 821-830.
[20] 闫晗, 舒泽亮, 姚家煊, 等. 基于三相-单相电力电子变压器的牵引供电系统负载不平衡、无功和谐波潮流分析[J]. 电力自动化设备, 2019, 39(11): 159-164.
Yan Han, Shu Zeliang, Yao Jiaxuan, et al.Power flow analysis of unbalance, reactive power and harmonics in traction power supply system based on three-phase to single-phase power electronic transformer[J]. Elec-tric Power Automation Equipment, 2019, 39(11): 159-164.
[21] Zhao Chuanhong, Dujic D, Mester A, et al.Power electronic traction transformer-medium voltage pro-totype[J]. IEEE Transactions on Industrial Electronics, 2014, 61(7): 3257-3268.