基于储能稳压的交直流混合电能路由器协调控制策略
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摘要
将交/直/交级联变换器、直流变换器、储能及其变换器通过公共直流母线组合,构成含两个交流端口、三个直流端口的电能路由器拓扑结构。分析典型运行模式并提出储能稳压的交直流混合电能路由器虚拟同步机协调控制策略:在交流单/双端并网模式下,通过储能稳定直流电压,两端交/直、直/交变换器通过虚拟同步机功率外环控制功率流向及大小;在交流双端离网模式下,通过储能稳定直流电压的同时,配合分布式电源为交直流负荷供电。所提策略无需模式切换,降低了控制复杂性,可实现电能路由器各模式下直流电压稳定、就地消纳分布式发电,保证交直流负荷持续稳定供电,还可实现双端并网时电网馈线间的柔性互联、电网故障时潮流转供以及双端离网下的自稳定运行,有效提高了低压配电网的供电可靠性。最后,通过仿真和实验验证了所提协调控制策略的正确性和有效性。
AC/DC/AC converters,DC converters,energy storage and their converters are combined through a common DC bus to form the topology of power router which has two AC ports and three DC ports.Then,the typical operation modes are analyzed and the coordinated control strategy of AC/DC hybrid power router based on energy storage stabilizing voltage and virtual motor is proposed.Under the mode of single or double AC ports connecting to the grid,the power flow of two AC-DC converters are controlled by the power outer loop of virtual motor,while the DC voltage keeps steady due to energy storage.When both the AC ports are off-grid,not only keeps the DC voltage stable,but also supplies for AC and DC loads.The proposed strategy reduces the complexity of device control without mode switching.The stability of DC voltage is achieved in each operation mode,and the distributed generation is accommodated by local loads,and the constant and stable power supply for AC and DC load is ensured.Moreover,the flexible interconnection between the feeder lines of the distribution network is realized,and the power flows are transferred when the power grid fails,while the self-stable operation is realized when both the AC ports are off-grid,which effectively improves the power supply reliability of the low-voltage distribution network.Finally,the correctness and effectiveness of the proposed coordinated control strategy are verified by simulation and experiments.
AC/DC/AC converters,DC converters,energy storage and their converters are combined through a common DC bus to form the topology of power router which has two AC ports and three DC ports.Then,the typical operation modes are analyzed and the coordinated control strategy of AC/DC hybrid power router based on energy storage stabilizing voltage and virtual motor is proposed.Under the mode of single or double AC ports connecting to the grid,the power flow of two AC-DC converters are controlled by the power outer loop of virtual motor,while the DC voltage keeps steady due to energy storage.When both the AC ports are off-grid,not only keeps the DC voltage stable,but also supplies for AC and DC loads.The proposed strategy reduces the complexity of device control without mode switching.The stability of DC voltage is achieved in each operation mode,and the distributed generation is accommodated by local loads,and the constant and stable power supply for AC and DC load is ensured.Moreover,the flexible interconnection between the feeder lines of the distribution network is realized,and the power flows are transferred when the power grid fails,while the self-stable operation is realized when both the AC ports are off-grid,which effectively improves the power supply reliability of the low-voltage distribution network.Finally,the correctness and effectiveness of the proposed coordinated control strategy are verified by simulation and experiments.
引文
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[22]陈杰,陈新,冯志阳,等.微网系统并网/孤岛运行模式无缝切换控制策略[J].中国电机工程学报,2014,34(19):3089-3097.CHEN Jie,CHEN Xin,FENG Zhiyang,et al.A control strategy of seamless transfer between grid-connected and islanding operation for microgrid[J].Proceedings of the CSEE,2014,34(19):3089-3097.
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[27]王成山,宋关羽,李鹏,等.基于智能软开关的智能配电网柔性互联技术及展望[J].电力系统自动化,2016,40(22):168-175.DOI:10.7500/AEPS20160620009.WANG Chengshan,SONG Guanyu,LI Peng,et al.Research and prospect for soft open point based flexible interconnection technology for smart distribution network[J].Automation of Electric Power Systems,2016,40(22):168-175.DOI:10.7500/AEPS20160620009.
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[2]孙宏斌,郭庆来,潘昭光.能源互联网:理念、架构与前沿展望[J].电力系统自动化,2015,39(19):1-8.DOI:10.7500/AEPS20150701007.SUN Hongbin,GUO Qinglai,PAN Zhaoguang.Energy Internet:concept,architecture and frontier outlook[J].Automation of Electric Power Systems,2015,39(19):1-8.DOI:10.7500/AEPS20150701007.
[3]马钊,安婷,尚宇炜.国内外配电前沿技术动态及发展[J].中国电机工程学报,2016,36(6):1552-1567.MA Zhao,AN Ting,SHANG Yuwei.State of the art and development trends of power distribution technologies[J].Proceedings of the CSEE,2016,36(6):1552-1567.
[4]CAO Yijia,LI Qiang,TAN Yi,et al.A comprehensive review of Energy Internet:basic concept,operation and planning methods,and research prospects[J].Journal of Modern Power Systems and Clean Energy,2018,6(3):399-411.
[5]宗升,何湘宁,吴建德,等.基于电力电子变换的电能路由器研究现状与发展[J].中国电机工程学报,2015,35(18):4559-4570.ZONG Sheng,HE Xiangning,WU Jiande,et al.Overview of power electronics based electrical energy router[J].Proceedings of the CSEE,2015,35(18):4559-4570.
[6]田世明,栾文鹏,张东霞,等.能源互联网技术形态与关键技术[J].中国电机工程学报,2015,35(14):3482-3494.TIAN Shiming,LUAN Wenpeng,ZHANG Dongxia,et al.Technical forms and key technologies on energy internet[J].Proceedings of the CSEE,2015,35(14):3482-3494.
[7]郭慧,汪飞,张笠君,等.基于能量路由器的智能型分布式能源网络技术[J].中国电机工程学报,2016,36(12):3314-3325.GUO Hui,WANG Fei,ZHANG Lijun,et al.Technologies of energy router-based smart distributed energy network[J].Proceedings of the CSEE,2016,36(12):3314-3325.
[8]盛万兴,段青,梁英,等.面向能源互联网的灵活配电系统关键装备与组网形态研究[J].中国电机工程学报,2015,35(15):3760-3769.SHENG Wanxing,DUAN Qing,LIANG Ying,et al.Research of power distribution and application grid structure and equipment for future energy internet[J].Proceedings of the CSEE,2015,35(15):3760-3769.
[9]段青,盛万兴,孟晓丽,等.面向能源互联网的新型能源子网系统研究[J].中国电机工程学报,2016,36(2):388-398.DUAN Qing,SHENG Wanxing,MENG Xiaoli,et al.Research on energy sub grid for the future energy internet[J].Proceedings of the CSEE,2016,36(2):388-398.
[10]吴聪,唐巍,白牧可,等.基于能源路由器的用户侧能源互联网规划[J].电力系统自动化,2017,41(4):20-28.DOI:10.7500/AEPS20160802010.WU Cong,TANG Wei,BAI Muke,et al.Energy router based planning of Energy Internet at user side[J].Automation of Electric Power Systems,2017,41(4):20-28.DOI:10.7500/AEPS20160802010.
[11]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.
[12]田兵,雷金勇,郭晓斌,等.多接口能源路由器主回路结构及功能仿真[J].电力系统自动化,2017,41(10):16-21.DOI:10.7500/AEPS20160803007.TIAN Bing,LEI Jinyong,GUO Xiaobin,et al.Main circuit structure and function simulation of multi-interface energy router[J].Automation of Electric Power Systems,2017,41(10):16-21.DOI:10.7500/AEPS20160803007.
[13]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 Wanxing,LIU Haitao,ZENG Zheng,et al.An energy hub based on virtual-machine control[J].Proceedings of the CSEE,2015,35(14):3541-3550.
[14]盛万兴,兰征,段青,等.自储能型能量路由器研究[J].电网技术,2017,41(2):387-393.SHENG Wanxing,LAN Zheng,DUAN Qing,et al.Study on self energy storage based energy router[J].Power System Technology,2017,41(2):387-393.
[15]曹阳,袁立强,朱少敏,等.面向能源互联网的配网能量路由器关键参数设计[J].电网技术,2015,39(11):3094-3101.CAO Yang,YUAN Liqiang,ZHU Shaomin,et al.Parameter design of energy router orienting energy internet[J].Power System Technology,2015,39(11):3094-3101.
[16]吴卫民,何远彬,耿攀,等.直流微网研究中的关键技术[J].电工技术学报,2012,27(1):98-106.WU Weimin,HE Yuanbin,GENG Pan,et al.Key technologies for DC micro-grids[J].Transactions of China Electrotechnical Society,2012,27(1):98-106.
[17]BON-GWAN G,NAM K.A DC-link capacitor minimization method through direct capacitor current control[J].IEEETransactions on Industry Applications,2002,33(5):811-817.
[18]韦雪菲,卢泉,胡立坤,等.基于混合储能的功率前馈稳压控制策略研究[J].广西大学学报(自然科学版),2017,42(6):2050-2058.WEI Xuefei,LU Quan,HU Likun,et al.Research on power feed-forward voltage control strategy based on hybrid energy storage[J].Journal of Guangxi University(Natural Science Edition),2017,42(6):2050-2058.
[19]黎阳,王林,黄辉,等.无通信互联线储能系统的直流母线协调控制策略[J].电力系统自动化,2018,42(1):118-124.DOI:10.7500/AEPS20170705001.LI Yang,WANG Lin,HUANG Hui,et al.Coordinated control strategy for DC bus of energy storage system without communication interconnection line[J].Automation of Electric Power Systems,2018,42(1):118-124.DOI:10.7500/AEPS20170705001.
[20]肖迁,何晋伟,王浩,等.电网故障下的电能路由器直流电容电压平衡控制策略[J].电力系统自动化,2018,42(2):20-25.DOI:10.7500/AEPS20170707009.XIAO Qian,HE Jinwei,WANG Hao,et al.Voltage balance control strategy for DC capacitor of electrical energy router under power grid failure[J].Automation of Electric Power Systems,2018,42(2):20-25.DOI:10.7500/AEPS20170707009.
[21]曾正,李辉,冉立.交流微电网逆变器控制策略述评[J].电力系统自动化,2016,40(9):142-151.DOI:10.7500/AEPS20150226006.ZENG Zheng,LI Hui,RAN Li.Comparison on control strategies of inverters in AC microgrids[J].Automation of Electric Power Systems,2016,40(9):142-151.DOI:10.7500/AEPS20150226006.
[22]陈杰,陈新,冯志阳,等.微网系统并网/孤岛运行模式无缝切换控制策略[J].中国电机工程学报,2014,34(19):3089-3097.CHEN Jie,CHEN Xin,FENG Zhiyang,et al.A control strategy of seamless transfer between grid-connected and islanding operation for microgrid[J].Proceedings of the CSEE,2014,34(19):3089-3097.
[23]ZHONG Qingchang,WEISS G.Synchronverters:inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electronics,2011,58(4):1259-1267.
[24]吴恒,阮新波,杨东升,等.虚拟同步发电机功率环的建模与参数设计[J].中国电机工程学报,2015,35(24):6508-6518.WU Heng,RUAN Xinbo,YANG Dongsheng,et al.Modeling of the power loop and parameter design of virtual synchronous generators[J].Proceedings of the CSEE,2015,35(24):6508-6518.
[25]HUR N.A fast dynamic DC-link power-balancing scheme for a PWM converter-inverter system[J].IEEE Transactions on Industrial Electronics,2001,48(4):794-803.
[26]郭力,冯怿彬,李霞林,等.直流微电网稳定性分析及阻尼控制方法研究[J].中国电机工程学报,2016,36(4):927-936.GUO Li,FENG Yibin,LI Xialin,et al.Stability analysis and research of active damping method for DC micro-grids[J].Proceedings of the CSEE,2016,36(4):927-936.
[27]王成山,宋关羽,李鹏,等.基于智能软开关的智能配电网柔性互联技术及展望[J].电力系统自动化,2016,40(22):168-175.DOI:10.7500/AEPS20160620009.WANG Chengshan,SONG Guanyu,LI Peng,et al.Research and prospect for soft open point based flexible interconnection technology for smart distribution network[J].Automation of Electric Power Systems,2016,40(22):168-175.DOI:10.7500/AEPS20160620009.
[28]王成山,孙充勃,李鹏,等.基于SNOP的配电网运行优化及分析[J].电力系统自动化,2015,39(9):82-87.DOI:10.7500/AEPS20140828002.WANG Chengshan,SUN Chongbo,LI Peng,et al.SNOP-based operation optimization and analysis of distribution networks[J].Automation of Electric Power Systems,2015,39(9):82-87.DOI:10.7500/AEPS20140828002.
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