基于MMC的中压大功率直流配电方案及其控制方法
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摘要
为了节省系统的体积,提出了一种新颖的中压直流配电方案,采用模块化多电平换流器(MMC)和二级管不控整流的结构。将MMC的输出交流电压、电流的基波频率设定在1kHz,与传统50Hz控制算法相比,可以在很大程度上减小变流器的体积。由于基波频率的提高,必须简化调制算法,提出了一种MMC方波调制策略,与传统MMC调制算法相比可以节约控制器资源。另外,为了测试整个系统额定运行工况,提出了一种电阻微循环的控制结构,可以实现功率的内部循环,仅从电网吸收电阻消耗的功率和系统的耗散功率,从而可以大大减小电网的压力。
A novel medium voltage DC power distribution scheme is proposed.In order to save the system volume,the structure of modular multilevel converter(MMC)and diode rectifier is used.Compared with the traditional 50 Hz control algorithm,the size of the converter can be greatly reduced by setting the output AC voltage and current base frequency to 1kHz.As the fundamental frequency increases,the modulation algorithm must be simplified.An MMC square wave modulation strategy is proposed,which can save the controller resources compared with the traditional MMC modulation algorithm.In order to test the whole system rated operating conditions,a resistance microcirculation control scheme is proposed.The solution can achieve the internal power cycle,and the grid only provides the power consumption of the resistance and the system power dissipation,which can greatly reduce the pressure of the grid.
A novel medium voltage DC power distribution scheme is proposed.In order to save the system volume,the structure of modular multilevel converter(MMC)and diode rectifier is used.Compared with the traditional 50 Hz control algorithm,the size of the converter can be greatly reduced by setting the output AC voltage and current base frequency to 1kHz.As the fundamental frequency increases,the modulation algorithm must be simplified.An MMC square wave modulation strategy is proposed,which can save the controller resources compared with the traditional MMC modulation algorithm.In order to test the whole system rated operating conditions,a resistance microcirculation control scheme is proposed.The solution can achieve the internal power cycle,and the grid only provides the power consumption of the resistance and the system power dissipation,which can greatly reduce the pressure of the grid.
引文
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[11]赵俊华,文福拴,杨爱民,等.电动汽车对电力系统的影响及其调度与控制问题[J].电力系统自动化,2011,35(14):2-10.ZHAO Junhua,WEN Fushuan,YANG Aimin,et al.Impacts of electric vehicles on power systems as well as the associated dispatching and control problem[J].Automation of Electric Power Systems,2011,35(14):2-10.
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[14]赵彪,宋强,刘文华,等.用于柔性直流配电的高频链直流固态变压器[J].中国电机工程学报,2014,34(25):4295-4303.ZHAO Biao,SONG Qiang,LIU Wenhua,et al.Highfrequency-link DC solid state transformers for flexible DCdistribution[J].Proceedings of the CSEE,2014,34(25):4295-4303.
[15]崔福博,郭剑波,荆平,等.直流配电技术综述[J].电网技术,2014,38(3):556-564.CUI Fubo,GUO Jianbo,JING Ping,et al.A review of DCpower distribution technology[J].Power System Technology,2014,38(3):556-564.
[16]AYYANAR R,GIRI R,MOHAN N.Active input-voltage and load-current sharing in input-series and output-parallel connected modular DC-DC converters using dynamic inputvoltage reference scheme[J].IEEE Transactions on Power Electronics,2004,19(6):1462-1473.
[17]MOHAN N,UNDELAND T M,ROBBINS W P.Power electronics:converters,applications,and design[M].Hoboken:Uohn Wiley&Sons,2007:172-178.
[18]CUI S,SOLTAU N,DONCKER R W D.A high step-up ratio soft-switching DC-DC converter for interconnection of MVDCand HVDC grids[J].IEEE Transactions on Power Electronics,2018,33(4):2986-3001.
[19]梁改革.模块化多电平变换器低频运行控制方法研究[D].徐州:中国矿业大学,2014.LIANG Gaige.Research on control scheme for low frequency operation of the modular multilevel converter[D].Xuzhou:China University of Mining and Technology,2014.
[20]HU P,JIANG D.A level-increased nearest level modulation method for modular multilevel converters[J].IEEETransactions on Power Electronics,2015,30(4):1836-1842.
[2]赵彪,赵宇明,王一振,等.基于柔性中压直流配电的能源互联网系统[J].中国电机工程学报,2015,35(19):4843-4851.ZHAO Biao,ZHAO Yuming,WANG Yizhen,et al.Energy internet based on flexible medium-voltage DC distribution[J].Proceedings of the CSEE,2015,35(19):4843-4851.
[3]薛士敏,陈超超,金毅,等.直流配电系统保护技术研究综述[J].中国电机工程学报,2014,34(19):3114-3122.XUE Shimin,CHEN Chaochao,JIN Yi,et al.A research review of protection technology for DC distribution system[J].Proceedings of the CSEE,2014,34(19):3114-3122.
[4]LI H,LI W,LUO M,et al.Design of smart MVDC power grid protection[J].IEEE Transactions on Instrumentation and Measurement,2011,60(9):3035-3046.
[5]杨晓峰,郑琼林,林智钦,等.用于直流电网的大容量DC/DC变换器研究综述[J].电网技术,2016,40(3):670-677.YANG Xiaofeng,ZHENG Trillion Q,LIN Zhiqin,et al.Survey of high-power DC/DC converter for HVDC grid application[J].Power System Technology,2016,40(3):670-677.
[6]魏晓光,王新颖,高冲,等.用于直流电网的高压大容量DC/DC变换器拓扑研究[J].中国电机工程学报,2014,34(增刊1):218-224.WEI Xiaoguang,WANG Xinying,GAO Chong,et al.Topologies research of high voltage and high power DC/DCconverters used in DC grids[J].Proceedings of the CSEE,2014,34(Supplement 1):218-224.
[7]SOLTAU N,STAGGE H,DONCKER R W D,et al.Development and demonstration of a medium-voltage highpower DC-DC converter for DC distribution systems[C]//2014IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems(PEDG),June 24-27,2014,Galway,Ireland:1-8.
[8]ORTIZ G,UEMURA H,BORTIS D,et al.Modeling of softswitching losses of IGBTs in high-power high-efficiency dualactive-bridge DC/DC converters[J].IEEE Transactions on Electron Devices,2013,60(2):587-597.
[9]王丹,柳依然,梁翔,等.直流配电网电压等级序列研究[J].电力系统自动化,2015,39(9):19-25.DOI:10.7500/AEPS20140623011.WANG Dan,LIU Yiran,LIANG Xiang,et al.DC distribution network voltage class series[J].Automation of Electric Power Systems,2015,39(9):19-25.DOI:10.7500/AEPS20140623011.
[10]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.JIANG Daozhuo,ZHENG Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104.
[11]赵俊华,文福拴,杨爱民,等.电动汽车对电力系统的影响及其调度与控制问题[J].电力系统自动化,2011,35(14):2-10.ZHAO Junhua,WEN Fushuan,YANG Aimin,et al.Impacts of electric vehicles on power systems as well as the associated dispatching and control problem[J].Automation of Electric Power Systems,2011,35(14):2-10.
[12]王成山,李鹏.分布式发电、微网与智能配电网的发展与挑战[J].电力系统自动化,2010,34(2):10-14.WANG Chenshan,LI Peng.Development and challenges of distributed generation,the micro-grid and smart distribution system[J].Automation of Electric Power Systems,2010,34(2):10-14.
[13]王建,李兴源,邱晓燕.含有分布式发电装置的电力系统研究综述[J].电力系统自动化,2005,29(24):90-97.WANG Jian,LI Xingyuan,QIU Xiaoyan.Power system research on distribution generation penetration[J].Automation of Electric Power Systems,2005,29(24):90-97.
[14]赵彪,宋强,刘文华,等.用于柔性直流配电的高频链直流固态变压器[J].中国电机工程学报,2014,34(25):4295-4303.ZHAO Biao,SONG Qiang,LIU Wenhua,et al.Highfrequency-link DC solid state transformers for flexible DCdistribution[J].Proceedings of the CSEE,2014,34(25):4295-4303.
[15]崔福博,郭剑波,荆平,等.直流配电技术综述[J].电网技术,2014,38(3):556-564.CUI Fubo,GUO Jianbo,JING Ping,et al.A review of DCpower distribution technology[J].Power System Technology,2014,38(3):556-564.
[16]AYYANAR R,GIRI R,MOHAN N.Active input-voltage and load-current sharing in input-series and output-parallel connected modular DC-DC converters using dynamic inputvoltage reference scheme[J].IEEE Transactions on Power Electronics,2004,19(6):1462-1473.
[17]MOHAN N,UNDELAND T M,ROBBINS W P.Power electronics:converters,applications,and design[M].Hoboken:Uohn Wiley&Sons,2007:172-178.
[18]CUI S,SOLTAU N,DONCKER R W D.A high step-up ratio soft-switching DC-DC converter for interconnection of MVDCand HVDC grids[J].IEEE Transactions on Power Electronics,2018,33(4):2986-3001.
[19]梁改革.模块化多电平变换器低频运行控制方法研究[D].徐州:中国矿业大学,2014.LIANG Gaige.Research on control scheme for low frequency operation of the modular multilevel converter[D].Xuzhou:China University of Mining and Technology,2014.
[20]HU P,JIANG D.A level-increased nearest level modulation method for modular multilevel converters[J].IEEETransactions on Power Electronics,2015,30(4):1836-1842.