基于电压源型换流器的多端直流配电网潮流计算
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摘要
随着分布式电源及电力电子技术的发展,基于电压源型换流器(VSC)的直流配电网具有接入灵活、可靠性高、经济性好等优点。在详细分析了VSC稳态潮流模型的基础上,计及直流配电网的运行控制策略,研究了基于VSC的多端直流配电网潮流计算。在潮流计算过程中,采用节点关联矩阵对网络结构进行自动搜索和自动开环处理,提出了针对环网和下垂节点的统一功率修正方法,并考虑了VSC的功率限制及其控制方式的转换。最后,利用修改后的IEEE 14节点直流配电网算例,验证了所提直流配电网潮流计算方法的有效性和正确性。
With the development of distributed generation and power electronic technology,DC distribution network based on voltage source converter(VSC)has many advantages,such as flexible access,high reliability and good economic efficiency.Based on the detailed analysis of the VSC steady-state power flow model,the power flow calculation of multi-terminal DC distribution network is studied through taking into account the operation control strategy of the DC distribution network.In the process of power flow calculation,it uses the node correlation matrix to search automatically the network structure and open automatically the looped network.It proposes a unified power correction method for looped network and droop node,and takes into account the power limitation and control mode conversion of VSC.With the modified IEEE 14-node DC distribution example system,it verifies the correctness and validity of the proposed power flow calculation method.
With the development of distributed generation and power electronic technology,DC distribution network based on voltage source converter(VSC)has many advantages,such as flexible access,high reliability and good economic efficiency.Based on the detailed analysis of the VSC steady-state power flow model,the power flow calculation of multi-terminal DC distribution network is studied through taking into account the operation control strategy of the DC distribution network.In the process of power flow calculation,it uses the node correlation matrix to search automatically the network structure and open automatically the looped network.It proposes a unified power correction method for looped network and droop node,and takes into account the power limitation and control mode conversion of VSC.With the modified IEEE 14-node DC distribution example system,it verifies the correctness and validity of the proposed power flow calculation method.
引文
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[16]王成山,孙充勃,彭克,等.微电网交直流混合潮流算法研究[J].中国电机工程学报,2013,33(4):8-15.WANG Chengshan,SUN Chongbo,PENG Ke,et al.Study on AC-DC hybrid power flow algorithm for microgrid[J].Proceedings of the CSEE,2013,33(4):8-15.
[17]杨舒婷,王承民,李骄阳,等.直流配电网的集中-分布式控制策略[J].电网技术,2016,40(10):3073-3080.YANG Shuting,WANG Chengmin,LI Jiaoyang,et al.Centralized-distributed control strategies in DC distribution[J].Power System Technology,2016,40(10):3073-3080.
[2]李霞林,郭力,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-17.LI Xialin,GUO Li,WANG Chengshan,et al.Key technologies of DC microgrids:an overview[J].Proceedings of the CSEE,2016,36(1):2-17.
[3]宋强,赵彪,刘文华,等.智能直流配电网研究综述[J].中国电机工程学报,2013,33(25):9-19.SONG Qiang,ZHAO Biao,LIU Wenhua,et al.An overview of research on smart DC distribution power network[J].Proceedings of the CSEE,2013,33(25):9-19.
[4]LIU T,LI G,HAN B,et al.Research on the topology of DCdistribution network and the influence of distributed generations access to the network[C]//5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies(DRPT),November 26-29,2015,Changsha,China.
[5]季一润,袁志昌,赵剑锋,等.一种适用于柔性直流配电网的电压控制策略[J].中国电机工程学报,2016,36(2):335-341.JI Yirun,YUAN Zhichang,ZHAO Jianfeng,et al.A suitable voltage control strategy for DC distribution power network[J].Proceedings of the CSEE,2016,36(2):335-341.
[6]YANG M,XIE D,ZHU H,et al.Architectures and control for multi-terminal DC(MTDC)distribution network review[C]//11th IET International Conference on AC and DC Power Transmission,February 10-12,2015,Birmingham,UK.
[7]刘天皓.直流配电网电压控制策略研究[D].北京:华北电力大学,2016.
[8]李亚楼,穆清,安宁,等.直流电网模型和仿真的发展与挑战[J].电力系统自动化,2014,38(4):127-135.DOI:10.7500/AEPS20130422006.LI Yalou,MU Qing,AN Ning,et al.Development and challenge of modeling and simulation of DC grid[J].Automation of Eletric Power Systems,2014,38(4):127-135.DOI:10.7500/AEPS20130422006.
[9]HAILU T,MACKAY L,GAJIC M,et al.From voltage stiff to voltage weak DC distribution grid:opportunities and challenges[C]//IEEE 2nd Annual Southern Power Electronics Conference(SPEC),December 5-8,2016,Auckland,New Zealand.
[10]RODRIGUEZ P,ROUZBEHI K.Multi-terminal DC grids:challenges and prospects[J].Journal of Modern Power Systems and Clean Energy,2017,5(4):515-523.
[11]陈谦,唐国庆,王浔.多端VSC-HVDC系统交直流潮流计算[J].电力自动化设备,2005,25(6):1-6.CHEN Qian,TANG Guoqing,WANG Xun.AC-DC power flow algorithm for multi-terminal VSC-HVDC systems[J].Electric Power Automation Equipment,2005,25(6):1-6.
[12]季聪,卫志农,孙国强,等.基于自动微分技术的VSC-HVDC潮流计算[J].电力系统及其自动化学报,2013,25(2):1-6.JI Cong,WEI Zhinong,SUN Guoqiang,et al.Power flow calculation of the AC-DC system with VSC-HVDC based on automatic differentiation[J].Proceedings of the CSU-EPSA,2013,25(2):1-6.
[13]DOU J,ZHANG B,CHAI R,et al.Unified iterative power flow algorithm of AC/DC networks incorporating hybrid HVDC[C]//IEEE 16th International Conference on Environment and Electrical Engineering(EEEIC),June 7-10,2016,Florence,Italy.
[14]AHMED H M A,ELTANTAWY A B,SALAMA M.Ageneralized approach to the load flow analysis of AC-DC hybrid distribution systems[J].IEEE Transactions on Power Systems,2018,33(2):2117-2127.
[15]薛振宇,房大中.基于双向迭代的交直流互联电力系统潮流计算[J].电力系统自动化,2013,37(5):61-67.XUE Zhenyu,FANG Dazhong.A power flow calculation algorithm for AC/DC interconnected power systems based on bi-directional iteration[J].Automation of Electric Power Systems,2013,37(5):61-67.
[16]王成山,孙充勃,彭克,等.微电网交直流混合潮流算法研究[J].中国电机工程学报,2013,33(4):8-15.WANG Chengshan,SUN Chongbo,PENG Ke,et al.Study on AC-DC hybrid power flow algorithm for microgrid[J].Proceedings of the CSEE,2013,33(4):8-15.
[17]杨舒婷,王承民,李骄阳,等.直流配电网的集中-分布式控制策略[J].电网技术,2016,40(10):3073-3080.YANG Shuting,WANG Chengmin,LI Jiaoyang,et al.Centralized-distributed control strategies in DC distribution[J].Power System Technology,2016,40(10):3073-3080.