配电网单–三相混合潮流计算模型及算法
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摘要
针对配电网三相潮流问题计算精确性和计算速度要求,提出了一种单–三相混合配电网潮流计算模型及算法。首先推导了电网三相潮流计算模型,然后根据配网不确定性特点,对局部的对称部分采用单相潮流计算,对于不对称部分采用三相潮流计算,2部分网络之间通过单–三相接口进行连接,从而实现单相网络与三相网络的统一建模;进而基于线路电流的不平衡度,自动确定单–三相接口的位置。算例证明了所提出的单–三相混合配电网潮流计算方法和动态接口策略的有效性和正确性。
In order to meet the requirements for computational accuracy and efficiency of three-phase power flow of distribution network,this paper proposes a model and algorithm for single-three phase hybrid power flow calculation of distribution network.Firstly,the calculation model of three-phase power flow is deduced.Then,considering the uncertainties of distribution network,the three-phase model is used for the part where significant unbalance exists,while the single-phase model is used for the part where unbalance is negligible.These two parts of network are interconnected through a single-three phase interface,realizing the unified modelling for the single-phase network and the three-phase network.Finally,the location of the interface between the single and three-phase parts is automatically determined based on the unbalanced degree of line current.The case study result has verified the feasibility and efficiency of the proposed single-three phase hybrid power flow calculation method and the dynamic selection strategy of interfaces.
In order to meet the requirements for computational accuracy and efficiency of three-phase power flow of distribution network,this paper proposes a model and algorithm for single-three phase hybrid power flow calculation of distribution network.Firstly,the calculation model of three-phase power flow is deduced.Then,considering the uncertainties of distribution network,the three-phase model is used for the part where significant unbalance exists,while the single-phase model is used for the part where unbalance is negligible.These two parts of network are interconnected through a single-three phase interface,realizing the unified modelling for the single-phase network and the three-phase network.Finally,the location of the interface between the single and three-phase parts is automatically determined based on the unbalanced degree of line current.The case study result has verified the feasibility and efficiency of the proposed single-three phase hybrid power flow calculation method and the dynamic selection strategy of interfaces.
引文
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[12]褚文捷,张小平,陈珩.不对称三相P-Q分解法潮流的并行计算[J].中国电机工程学报,1995,15(3):185-192.CHU Wenjie,ZHANG Xiaoping,CHEN Heng.Unsymmetrical three-phase P-Q decoupled load flow study by parallel professor[J].Proceedings of the CSEE,1995,15(3):185-192.
[13]何禹清,彭建春.基于序电流注入模型的三相潮流计算方法[J].中国电力,2008,41(3):7-11.HE Yuqing,PENG Jianchun.Three phase power flow solution based on node injection sequence currents[J].Electric Power,2008,41(3):7-11.
[14]王守相,李继平,王成山,等.配电网三相潮流算法比较研究[J].电力系统及其自动化学报,2000,12(2):26-31.WANG Shouxiang,LI Jiping,WANG Chengshan,et al.Comparison and research on three-phase power flow methods for distribution systems[J].Proceedings of the CSU-EPSA,2000,12(2):26-31.
[15]黄少伟,陈颖,沈沉.不对称电力系统相序混合建模与三相潮流算法[J].电力系统自动化,2011,35(14):68-73.HUANG Shaowei,CHEN Ying,SHEN Chen.Hybrid modeling of asymmetrical power system and three-phase power flow method[J].Automation of Electric Power Systems,2011,35(14):68-73.
[16]王志群,朱守真,周双喜,等.分布式发电对配电网电压分布的影响[J].电力系统自动化,2004,28(16):56-60.WANG Zhiqun,ZHU Shouzhen,ZHOU Shuangxi,et al.The influence of distributed generation on voltage distribution of distribution network[J].Automation of Electric Power Systems,2004,28(16):56-60.
[17]王成山,郑海峰,谢莹华,等.计及分布式发电的配电系统随机潮流计算[J].电力系统自动化,2005,29(24):39-44.WANG Chengshan,ZHENG Haifeng,XIE Yinghua,et al.Probabilistic power flow calculation of power distribution system of distributed generation[J].Automation of Electric Power Systems,2005,29(24):39-44.
[18]杨旭英,段建东,杨文宇,等.含分布式发电的配电网潮流计算[J].电网技术,2009,33(18):140-143.YANG Xuying,DUAN Jiandong,YANG Wenyu,et al.Power flow calculation of distribution of distributed generation[J].Power System Technology,2009,33(18):140-143.
[19]ENRICO C.Branch current decomposition method for loss allocation in radial distribution systems with distributed generation[J].IEEETrans on Power Systems,2006,21(3):1170-1179.
[20]SHIGENORI N,TAKAMU G,YOSHIKAZU F.Practical equipment models for fast distribution power flow considering interconnection of distributed generators[C]//IEEE Power Engineering Society Summer Meeting,Canada,2001:1007-1012.
[2]敖鑫,王淳,朱文广,等.两种配电网线性潮流计算方法及其比较[J].电网技术,2017,41(12):4004-4013.AO Xin,WANG Chun,ZHU Wenguang,et al.Derivation and comparison of two versions of linear power flow method for distribution networks[J].Power System Technology,2017,41(12):4004-4013.
[3]陈醒,卫志农,沈海平,等.基于双解耦的配电网三相不平衡快速潮流算法[J].电力自动化设备,2017,37(10):63-70.CHEN Xing,WEI Zhinong,SHEN Haiping,et al.Three-phase unbalanced fast power flow calculation algorithm based on double decoupling for distribution network[J].Electric Power Automation Equipment,2017,37(10):63-70.
[4]高元海,王淳,辛建波,等.计及接地阻抗及含多种分布式电源的中低压配电网三相潮流计算(一):模型[J].中国电机工程学报,2016,36(10):2619-2627.GAO Yuanhai,WANG Chun,XIN Jianbo,et al.Three-phase power flow calculation of medium-low voltage distribution network considering grounding impedance and containing various distributed generators,Part I:Models[J].Proceedings of the CSEE,2016,36(10):2619-2627.
[5]高元海,王淳,辛建波,等.计及接地阻抗及含多种分布式电源的中低压配电网三相潮流计算(二):算法和算例[J].中国电机工程学报,2016,36(14):3707-3717.GAO Yuanhai,WANG Chun,XIN Jianbo,et al.Three-phase power flow calculation of medium-low voltage distribution network considering grounding impedance and containing various distributed generators,PartⅡ:Algorithm and case study[J].Proceedings of the CSEE,2016,36(14):3707-3717.
[6]孟晓丽,唐巍,刘永梅,等.大规模复杂配电网三相不平衡潮流并行计算方法[J].电力系统保护与控制,2015,43(13):45-51.MENG Xiaoli,TANG Wei,LIU Yongmei,et al.Parallel computing of three-phase unbalanced power flow in large-scale complex distribution network[J].Power System Protection and Control,2015,43(13):45-51.
[7]徐青山,刘中泽,杨永标,等.改进的配电网三相潮流计算方法[J].电力系统及其自动化学报,2014,26(9):23-29.XU Qingshan,LIU Zhongze,YANG Yongbiao,et al.Improved method of distribution network three-phase power flow calculation[J].Proceedings of the CSU-EPSA,2014,26(9):23-29.
[8]李贵存,程利军,刘万顺,等.三相潮流计算在配电网自动化中的应用[J].继电器,2001,29(1):8-11.LI Guicun,CHENG Lijun,LIU Wanshun,et al.The application of three phase power flow calculation to distribution automation system[J].Relay,2001,29(1):8-11.
[9]车仁飞,李仁俊.一种少环配电网三相潮流计算新方法[J].中国电机工程学报,2003,16(1):75-80.CHE Renfei,LI Renjun.A new three-phase power flow method for weakly meshed distribution systems[J].Proceedings of the CSEE,2003,16(1):75-80.
[10]ZHANG Xiaoping.Fast three phase load flow methods[J].IEEETransactions on Power Systems,1996,11(3):1547-1554.
[11]张小平.解耦-补偿牛顿型三相潮流[J].电力系统自动化,1994,18(11):10-20.Zhang Xiaoping.Ocoupling-compensaton newton type three phase load flow[J].Automation of Electric Power Systems,1994,18(11):10-20.
[12]褚文捷,张小平,陈珩.不对称三相P-Q分解法潮流的并行计算[J].中国电机工程学报,1995,15(3):185-192.CHU Wenjie,ZHANG Xiaoping,CHEN Heng.Unsymmetrical three-phase P-Q decoupled load flow study by parallel professor[J].Proceedings of the CSEE,1995,15(3):185-192.
[13]何禹清,彭建春.基于序电流注入模型的三相潮流计算方法[J].中国电力,2008,41(3):7-11.HE Yuqing,PENG Jianchun.Three phase power flow solution based on node injection sequence currents[J].Electric Power,2008,41(3):7-11.
[14]王守相,李继平,王成山,等.配电网三相潮流算法比较研究[J].电力系统及其自动化学报,2000,12(2):26-31.WANG Shouxiang,LI Jiping,WANG Chengshan,et al.Comparison and research on three-phase power flow methods for distribution systems[J].Proceedings of the CSU-EPSA,2000,12(2):26-31.
[15]黄少伟,陈颖,沈沉.不对称电力系统相序混合建模与三相潮流算法[J].电力系统自动化,2011,35(14):68-73.HUANG Shaowei,CHEN Ying,SHEN Chen.Hybrid modeling of asymmetrical power system and three-phase power flow method[J].Automation of Electric Power Systems,2011,35(14):68-73.
[16]王志群,朱守真,周双喜,等.分布式发电对配电网电压分布的影响[J].电力系统自动化,2004,28(16):56-60.WANG Zhiqun,ZHU Shouzhen,ZHOU Shuangxi,et al.The influence of distributed generation on voltage distribution of distribution network[J].Automation of Electric Power Systems,2004,28(16):56-60.
[17]王成山,郑海峰,谢莹华,等.计及分布式发电的配电系统随机潮流计算[J].电力系统自动化,2005,29(24):39-44.WANG Chengshan,ZHENG Haifeng,XIE Yinghua,et al.Probabilistic power flow calculation of power distribution system of distributed generation[J].Automation of Electric Power Systems,2005,29(24):39-44.
[18]杨旭英,段建东,杨文宇,等.含分布式发电的配电网潮流计算[J].电网技术,2009,33(18):140-143.YANG Xuying,DUAN Jiandong,YANG Wenyu,et al.Power flow calculation of distribution of distributed generation[J].Power System Technology,2009,33(18):140-143.
[19]ENRICO C.Branch current decomposition method for loss allocation in radial distribution systems with distributed generation[J].IEEETrans on Power Systems,2006,21(3):1170-1179.
[20]SHIGENORI N,TAKAMU G,YOSHIKAZU F.Practical equipment models for fast distribution power flow considering interconnection of distributed generators[C]//IEEE Power Engineering Society Summer Meeting,Canada,2001:1007-1012.