基于拓展移相控制的直流配电网模块化多电平直流变压器
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摘要
分析了模块化多电平换流器(MMC)桥臂与H桥组成的MMC-H桥型直流变压器拓扑与运行特性,其中MMC采用阶梯波调制,H桥采用增加一个内移相的拓展移相调制。推导出直流变压器中间交流链电压电流表达式,给出传输功率表达式与回流功率求解方法并分析功率随参数变化的分布情况,总结了影响回流功率的因素,讨论了电压调节比的优化配置,凝练零回流功率的边界条件与回流功率优化工作区间。为抑制回流功率,该文提出了回流功率优化策略,通过调整内外移相实现直流变压器工作在回流功率优化工作区域,减小回流功率与电流应力。最后,搭建实验平台,对优化策略进行了实验验证。
This paper analyzes the topology and operation characteristics of MMC-H bridge DC transformer based on modular multilevel converter(MMC) arm and H-bridge,where the MMC adopts staircase modulation and the H-bridge adopts an extended phase shift modulation with an added phase shift.Besides,this paper deduces the expression of the voltage and current of the AC chain in the DC transformer.The expression of transmission power and algorithm of backflow power are deduced,and the distribution of power variation with parameters is analyzed.The factors that affect the backflow power are summarized,and the optimized voltage regulation ratio is discussed.Zero-backflow-power boundary conditions and backflow power optimized working area are condensed.In order to suppress the backflow power,this paper proposes a backflow power optimized strategy that DC transformer works in the optimized working area by adjusting of the inner/outer phase-shift,which reduces the backflow power and current stress.Finally,a physical prototype is built to verify the optimized strategy by experimental results.
This paper analyzes the topology and operation characteristics of MMC-H bridge DC transformer based on modular multilevel converter(MMC) arm and H-bridge,where the MMC adopts staircase modulation and the H-bridge adopts an extended phase shift modulation with an added phase shift.Besides,this paper deduces the expression of the voltage and current of the AC chain in the DC transformer.The expression of transmission power and algorithm of backflow power are deduced,and the distribution of power variation with parameters is analyzed.The factors that affect the backflow power are summarized,and the optimized voltage regulation ratio is discussed.Zero-backflow-power boundary conditions and backflow power optimized working area are condensed.In order to suppress the backflow power,this paper proposes a backflow power optimized strategy that DC transformer works in the optimized working area by adjusting of the inner/outer phase-shift,which reduces the backflow power and current stress.Finally,a physical prototype is built to verify the optimized strategy by experimental results.
引文
[1]国家能源局.2017年可再生能源发电产业情况[EB/OL].[2018-01-24].http://www.nea.gov.cn/2018-01/24/c_136920159.htm.
[2]郑欢,江道灼,杜翼.交流配电网与直流配电网的经济性比较[J].电网技术,2013,37(12):3368-3374.Zheng Huan,Jiang Daozhuo,Du Yi.Economic comparison of AC and DC distribution system[J].Power System Technology,2013,37(12):3368-3374.
[3]周逢权,黄伟.直流配电网系统关键技术探讨[J].电力系统保护与控制,2014,42(22):62-67.Zhou Fengquan,Huang Wei.Study on the key technology of DC distribution power network[J].Power System Protection and Control,2014,42(22):62-67.
[4]王朝辉,王天威,张军明.模块化多电平直流变压器研究[J].中国电机工程学报,2016,36(1):31-39.Wang Zhaohui,Wang Tianwei,Zhang Junming.Research on modular multilevel DC transformer[J].Proceedings of the CSEE,2016,36(1):31-39.
[5]王聪,沙广林,王俊,等.基于双重移相控制的双有源桥DC-DC变换器的软开关[J].电工技术学报,2015,30(12):106-113.Wang Cong,Sha Guanglin,Wang Jun,et al.The analysis of zero voltage switching dual active bridge DC-DC converters based on dual phase shifting control[J].Transactions of China Electrotechnical Society,2015,30(12):106-113.
[6]吴俊娟,孟德越,申彦峰,等.双重移相控制与传统移相控制相结合的双有源桥式DC-DC变换器优化控制策略[J].电工技术学报,2016,31(19):97-105Wu Junjuan,Meng Deyue,Shen Yanfeng,et al.Optimal control strategy of dual active bridge DC-DCconverter with combined dual-phase-shift and traditional-phase-shift controls[J].Transactions of China Electrotechnical Society,2016,31(19):97-105.
[7]Zhao Biao,Yu Qingguang,Sun Weixin.Extendedphase-shift control of isolated bidirectional DC-DCconverter for power distribution in microgrid[J].IEEETransactions on Power Electronics,2012,27(11):4667-4680.
[8]程红,高巧梅,朱锦标,等.基于双重移相控制的双向全桥DC-DC变换器动态建模与最小回流功率控制[J].电工技术学报,2014,29(3):245-253.Cheng Hong,Gao Qiaomei,Zhu Jinbiao,et al.Dynamic modeling and minimum backflow power controlling of the bi-directional full-bridge DC-DCconverters based on dual-phase-shifting control[J].Transactions of China Electrotechnical Society,2014,29(3):245-253.
[9]张勋,王广柱,王婷.双向全桥DC-DC变换器基于电感电流应力的双重移相优化控制[J].电工技术学报,2016,31(22):100-106.Zhang Xun,Wang Guangzhu,Wang Ting,et al.Optimized control based on current-stress of bidirectional full-bridge DC-DC converters with dualphase-shifting control[J].Transactions of China Electrotechnical Society,2016,31(22):100-106.
[10]Wu Kuiyuan,De Silva C W,Dunford W G.Stability analysis of isolated bidirectional dual active fullbridge DC-DC converter with triple phase-shift control[J].IEEE Transactions on Power Electronics,2012,27(4):2007-2017.
[11]Zhou Haihua,Khambadkone A M.Hybrid modulation for dual-active-bridge bidirectional converter with extended power range for ultracapacitor application[J]IEEE Transactions on Industry Applications,2008,45(4):1434-1442.
[12]Hou Nie,Song Wensheng,Wu Mingyi.Minimumcurrent-stress scheme of dual active bridge DC-DCconverter with unified phase-shift control[J].IEEETransactions on Power Electronics,2016,31(12):8552-8561.
[13]Adam G P,Gowaid I A,Finney S J,et al.Review of dc-dc converters for multi-terminal HVDCtransmission networks[J].IET Power Electronics,2016,9(2):281-296.
[14]Kenzelmann S,Rufer A,Dujic D,et al.Isolated DC/DC structure based on modular multilevel converter[J].IEEE Transactions on Power Electronics2014,30(1):89-98.
[15]Wang Zhaohui,Zhang Junming,Sheng Kuang.Modular multilevel power electronic transformer[C]//International Conference on Power Electronics&Ecce Asia,Seoul,South Korea,2015:315-321.
[16]Muthuraj S,Kanakesh V K,Das P,et al.Triple phase shift control of LLL tank based bidirectional dual active bridge converter[J].IEEE Transactions on Power Electronics,2017,32(10):8035-8053.
[2]郑欢,江道灼,杜翼.交流配电网与直流配电网的经济性比较[J].电网技术,2013,37(12):3368-3374.Zheng Huan,Jiang Daozhuo,Du Yi.Economic comparison of AC and DC distribution system[J].Power System Technology,2013,37(12):3368-3374.
[3]周逢权,黄伟.直流配电网系统关键技术探讨[J].电力系统保护与控制,2014,42(22):62-67.Zhou Fengquan,Huang Wei.Study on the key technology of DC distribution power network[J].Power System Protection and Control,2014,42(22):62-67.
[4]王朝辉,王天威,张军明.模块化多电平直流变压器研究[J].中国电机工程学报,2016,36(1):31-39.Wang Zhaohui,Wang Tianwei,Zhang Junming.Research on modular multilevel DC transformer[J].Proceedings of the CSEE,2016,36(1):31-39.
[5]王聪,沙广林,王俊,等.基于双重移相控制的双有源桥DC-DC变换器的软开关[J].电工技术学报,2015,30(12):106-113.Wang Cong,Sha Guanglin,Wang Jun,et al.The analysis of zero voltage switching dual active bridge DC-DC converters based on dual phase shifting control[J].Transactions of China Electrotechnical Society,2015,30(12):106-113.
[6]吴俊娟,孟德越,申彦峰,等.双重移相控制与传统移相控制相结合的双有源桥式DC-DC变换器优化控制策略[J].电工技术学报,2016,31(19):97-105Wu Junjuan,Meng Deyue,Shen Yanfeng,et al.Optimal control strategy of dual active bridge DC-DCconverter with combined dual-phase-shift and traditional-phase-shift controls[J].Transactions of China Electrotechnical Society,2016,31(19):97-105.
[7]Zhao Biao,Yu Qingguang,Sun Weixin.Extendedphase-shift control of isolated bidirectional DC-DCconverter for power distribution in microgrid[J].IEEETransactions on Power Electronics,2012,27(11):4667-4680.
[8]程红,高巧梅,朱锦标,等.基于双重移相控制的双向全桥DC-DC变换器动态建模与最小回流功率控制[J].电工技术学报,2014,29(3):245-253.Cheng Hong,Gao Qiaomei,Zhu Jinbiao,et al.Dynamic modeling and minimum backflow power controlling of the bi-directional full-bridge DC-DCconverters based on dual-phase-shifting control[J].Transactions of China Electrotechnical Society,2014,29(3):245-253.
[9]张勋,王广柱,王婷.双向全桥DC-DC变换器基于电感电流应力的双重移相优化控制[J].电工技术学报,2016,31(22):100-106.Zhang Xun,Wang Guangzhu,Wang Ting,et al.Optimized control based on current-stress of bidirectional full-bridge DC-DC converters with dualphase-shifting control[J].Transactions of China Electrotechnical Society,2016,31(22):100-106.
[10]Wu Kuiyuan,De Silva C W,Dunford W G.Stability analysis of isolated bidirectional dual active fullbridge DC-DC converter with triple phase-shift control[J].IEEE Transactions on Power Electronics,2012,27(4):2007-2017.
[11]Zhou Haihua,Khambadkone A M.Hybrid modulation for dual-active-bridge bidirectional converter with extended power range for ultracapacitor application[J]IEEE Transactions on Industry Applications,2008,45(4):1434-1442.
[12]Hou Nie,Song Wensheng,Wu Mingyi.Minimumcurrent-stress scheme of dual active bridge DC-DCconverter with unified phase-shift control[J].IEEETransactions on Power Electronics,2016,31(12):8552-8561.
[13]Adam G P,Gowaid I A,Finney S J,et al.Review of dc-dc converters for multi-terminal HVDCtransmission networks[J].IET Power Electronics,2016,9(2):281-296.
[14]Kenzelmann S,Rufer A,Dujic D,et al.Isolated DC/DC structure based on modular multilevel converter[J].IEEE Transactions on Power Electronics2014,30(1):89-98.
[15]Wang Zhaohui,Zhang Junming,Sheng Kuang.Modular multilevel power electronic transformer[C]//International Conference on Power Electronics&Ecce Asia,Seoul,South Korea,2015:315-321.
[16]Muthuraj S,Kanakesh V K,Das P,et al.Triple phase shift control of LLL tank based bidirectional dual active bridge converter[J].IEEE Transactions on Power Electronics,2017,32(10):8035-8053.