MMC-TYPE SOLID STATE TRANSFORMER CONTROLLED BY VIRTUAL SYNCHRONOUS GENERATOR TECHNOLOGY

Yang Hongpin; Yuan Zhi; Wang Weiqing; He Shan

doi:10.19912/j.0254-0096.tynxb.2021-0085

PDF(3432 KB)

Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (9) : 478-487. DOI: 10.19912/j.0254-0096.tynxb.2021-0085

MMC-TYPE SOLID STATE TRANSFORMER CONTROLLED BY VIRTUAL SYNCHRONOUS GENERATOR TECHNOLOGY

Yang Hongpin, Yuan Zhi, Wang Weiqing, He Shan

Author information +

History +

Abstract

When large capacity DC loads and high permeability distributed generation are connected to the low voltage side of the solid state transformer, the high-voltage grid-connected interface tends to exhibit low inertia and poor damping characteristics, which reduces its grid-connection friendliness and operational reliability. To solve this problem, a modular multilevel converter （MMC）-type solid state transformer controlled by virtual synchronous generator technology was proposed. Firstly, the principle of virtual synchronous generator was analyzed, and the equivalent mathematical model of MMC and virtual synchronous generator was deduced, and the virtual synchronous generator technology was integrated into the control strategy of the input stage, which enhances the inertia and damping of the grid-connected interface,presenting a friendly and flexible buffering capability to the upper grid when the power at the output side changes. Secondly, In order to improve the frequency support capacity of the MMC-type solid-state transformer to the upper-level power grid, the energy storage device was configured on the low-voltage DC bus, and the primary frequency control was actively responded by varying the charging and discharging power. Then, through the reactive power control of the input stage, it was verified that it has a certain voltage regulation capability. Finally, a simulation model was built to verify the effectiveness and feasibility of the proposed control strategy.

Key words

distributed power generation / power electronics / power quality / frequency modulation / virtual synchronous generator / solid state transformer

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Yang Hongpin, Yuan Zhi, Wang Weiqing, He Shan. MMC-TYPE SOLID STATE TRANSFORMER CONTROLLED BY VIRTUAL SYNCHRONOUS GENERATOR TECHNOLOGY[J]. Acta Energiae Solaris Sinica. 2022, 43(9): 478-487 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0085

References

[1] ZHANG J H, WANG W Y, BHATTACHARYA S.Architecture of solid state transformer-based energy router and models of energy traffic[C]//Proceedings of the 2012 IEEE PES Innovative Smart Grid Technologies(ISGT), Washington, DC, USA, 2012: 1-8.
[2] 李子欣, 高范强, 赵聪, 等. 电力电子变压器技术研究综述[J]. 中国电机工程学报, 2018, 38(5): 1274-1289.
LI Z X, GAO F Q, ZHAO C, et al.Research review of power electronic transformer technologies[J]. Proceedings of the CSEE, 2018, 38(5): 1274-1289.
[3] 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 Z X, WANG P, CHU Z F, et al.Research on medium- and high-voltage smart distribution grid oriented power electronic transformer[J]. Power system technology, 2013, 37(9): 2592-2601.
[4] HUBER J E, KOLAR J W.Solid-state transformers: on the origins and evolution of key concepts[J]. IEEE industrial electronics magazine, 2016, 10(3): 19-28.
[5] LI D Y, JI Z D, SUN Y C, et al.Four-port solid-state transformer based on hybrid MMC with enhanced dual half-bridge submodules[J]. IET power electronics, 2020, 13(12): 2432-2441.
[6] 高范强, 李子欣, 徐飞, 等. 一种高频链模块化电力电子变压器[J]. 电工电能新技术, 2017, 36(5): 51-58.
GAO F Q, LI Z X, XU F, et al.Power electronic transformer based on modular converter with high-frequency link[J]. Advanced technology of electrical engineering and energy, 2017, 36(5): 51-58.
[7] 王轩, 付永生, 晋湾湾, 等. 一种新型结构的电力电子变压器[J]. 电工电能新技术, 2017, 36(5): 67-74.
WANG X, FU Y S, JIN W W, et al.Novel topology of power electronic transformer[J]. Advanced technology of electrical engineering and energy, 2017, 36(5): 67-74.
[8] 王婷, 王广柱, 张勋. 基于模块化多电平矩阵变换器的电力电子变压器控制策略[J]. 电工技术学报, 2016, 31(18): 108-115.
WANG T, WANG G Z, ZHANG X.The control strategy of power electronic transformer based on modular multilevel matrix converters[J]. Transactions of China Electrotechnical Society, 2016, 31(18): 108-115.
[9] 马大俊, 陈武, 薛晨炀, 等. 低压直流母线AC-DC电力电子变压器及其短路故障穿越方法[J]. 电力系统自动化, 2019, 43(8): 158-172.
MA D J, CHEN W, XUE C Y, et al.AC-DC power electronic transformer with low-voltage DC bus and strategy of short-circuit fault ride-through[J]. Automation of electric power systems, 2019, 43(8): 158-172.
[10] 周廷冬, 徐永海, 吕晓慧. 基于MMC的配电网电力电子变压器接地设计及故障特性分析[J]. 电网技术, 2017, 41(12): 4077-4088.
ZHOU T D, XU Y H, LV X H.Grounding design and fault characteristic analysis of MMC based power electronic transformer in distribution network[J]. Power system technology, 2017, 41(12): 4077-4088.
[11] 周廷冬, 徐永海. 基于MMC的配电网电力电子变压器故障特性分析[J]. 电工电能新技术, 2017, 36(5): 34-41.
ZHOU T D, XU Y H.Fault characteristic analysis of power electronic transformer based on MMC in distribution network[J]. Advanced technology of electrical engineering and energy, 2017, 36(5): 34-41.
[12] 徐永海, 周廷冬. 功率开关故障情况下MMC型电力电子变压器的故障穿越运行策略[J]. 南方电网技术, 2017, 11(8): 16-33.
XU Y H, ZHOU T D.Fault ride through strategy for MMC based power electronic transformer considering power switches failures[J]. Southern power system technology, 2017, 11(8): 16-33.
[13] 韩继业, 李勇, 曹一家, 等. 一种新型的模块化多电平型固态变压器及其内模控制策略[J]. 中国科学: 技术科学, 2016, 46(5): 518-526.
HAN J Y, LI Y, CAO Y J, et al.A new modular multilevel type solid state transformer with internal model control method[J]. Scientia sinica(technologica), 2016, 46(5): 518-526.
[14] 袁义生, 唐喆. 智能配电网电压跌落下的电力电子变压器运行研究[J]. 电力自动化设备, 2019, 39(2): 44-49.
YUAN Y S, TANG Z.Research on PET in smart distribution network under voltage sag[J]. Electric power automation equipment, 2019, 39(2): 44-49.
[15] 张爱萍, 陆振纲, 宋洁莹, 等. 应用于交直流配电网的电力电子变压器[J]. 电力建设, 2017, 38(6): 66-72.
ZHANG A P, LU Z G, SONG J Y, et al.Power Electronic transformer used in AC/DC hybrid distribution network[J]. Electric power construction, 2017, 38(6): 66-72.
[16] 韩继业, 李勇, 段义隆, 等. 适用于中高压配电网的MMC-SST型电能质量综合治理方法[J]. 电力系统及其自动化学报, 2017, 29(9): 42-47.
HAN J Y, LI Y, DUAN Y L, et al.MMC-SST type comprehensive power quality management method for the medium-and high-voltage distribution network[J]. Proceedings of the CSU-EPSA, 2017, 29(9): 42-47.
[17] 韩继业, 李勇, 曹一家, 等. 基于模块化多电平型固态变压器的新型直流微网架构及其控制策略[J]. 电网技术, 2016, 40(3): 733-740.
HAN J Y, LI Y, CAO Y J, et al.A new DC microgrid architecture based on MMC-SST and its control strategy[J]. Power system technology, 2016, 40(3): 733-740.
[18] DU W J, BI J T, WANG T, et al.Impact of grid connection of large-scale wind farms on power system small-signal angular stability[J]. CSEE journal of power & energy systems, 2015, 1(2): 83-89.
[19] KATIRAEI F, IRAVANI M R.Power management strategies for a microgrid with multiple distributed generation units[J]. IEEE transactions on power systems, 2006, 21(4): 1821-1831.
[20] 盛万兴, 刘海涛, 曾正, 等. 一种基于虚拟电机控制的能量路由器[J]. 中国电机工程学报, 2015, 35(14): 3541-3550.
SHENG W X, LIU H T, ZENG Z, et al.An energy hub based on virtual-machine control[J]. Proceedings of the CSEE, 2015, 35(14): 3541-3550.
[21] ZHONG Q C, WEISS G.Synchronverters: inverters that mimic synchronous generators[J]. IEEE transactions on industrial electronics, 2011, 58(4): 1259-1267.
[22] 吕志鹏, 盛万兴, 钟庆昌, 等. 虚拟同步发电机及其在微网中的应用[J]. 中国电机工程学报, 2014, 34(16): 2591-2603.
LYU Z P, SHENG W X, ZHONG Q C, et al.Virtual synchronous generator and its applications in micro-grid[J]. Proceedings of the CSEE, 2014, 34(16): 2591-2603.
[23] 屠卿瑞, 徐政, 郑翔, 等. 模块化多电平换流器型直流输电内部环流机理分析[J]. 高电压技术, 2010, 36(2): 547-552.
TU Q R, XU Z, ZHENG X, et al.Mechanism analysis on the circulating current in modular multilevel converter based HVDC[J]. High voltage engineering, 2010, 36(2): 547-552.
[24] 杨晓峰, 李泽杰, 郑琼林. 基于虚拟阻抗滑模控制的MMC环流抑制策略[J]. 中国电机工程学报, 2018, 38(23): 6893-7123.
YANG X F, LI Z J, ZHENG T Q.A novel MMC circulating current suppressing strategy based on virtual impedance sliding mode control[J]. Proceedings of the CSEE, 2018, 38(23): 6893-7123.
[25] 公铮, 伍小杰, 王钊, 等. 基于载波移相调制的模块化多电平变换器变频运行控制[J]. 中国电机工程学报, 2015, 35(11): 2822-2830.
GONG Z, WU X J, WANG Z, et al.Variable frequency operation control of modular multilevel converter based on carrier phase-shift modulation[J]. Proceedings of the CSEE, 2015, 35(11): 2822-2830.