源-网协同的中压交直流混合配电网换流器选址研究
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摘要
对于含有高比例直流电源和直流负荷的配电网,采用交直流混合配电网具有降低能量转换损耗、提高潮流控制能力等优势。换流器的位置确定了混合配电网中交直流边界的划分,在对交直流混合配电网规划过程中,以换流器位置作为变量与以每段线路的交直流类型为变量相比,能显著降低变量数量并提高求解效率。提出了源–网协同的中压交直流混合配电网换流器选址方法,通过换流器的选址,在网端确定配电网的交直流划分,在源端确定光伏和电池储能在各接入点的容量分配。以中压交直流混合配电网设备全生命周期内,含建设和运行两要素的净收益为目标函数,并使用含混合整数和二阶锥松弛的优化模型求解不同选址方案的运行收益及成本;采用基于精英策略的遗传算法,对目标函数进行寻优,进而确定最优选址方案;最后以IEEE 33节点系统为基础构建算例,对提出的方法进行验证。
For distribution network with high proportion DC power and load,the AC-DC hybrid distribution network has the advantages of reducing energy conversion loss and improving power flow control ability and so on. The boundaries of AC and DC sub-networks in the hybrid distribution network can be determined by the location of converters. During the planning of AC-DC hybrid distribution network,using the converter locations as variables instead of using AC-DC configuration of every branches in the network can significantly reduce the number of variables and improve the solution efficiency. This paper proposed a sourcegrid coordinated converter location method for medium voltage AC-DC hybrid distribution network. Through the configuration of converter location,in terms of grid the AC and DC configuration of the network is determined,in terms of source the capacity allocation at each access point of photovoltaic and battery storage system is determined. In this paper,the annual profit of the distribution network including construction and operation two elements in the entire lifetime of equipment is chosen to be the objective function,and a mixed integer second order cone relaxed model is used to calculate the intraday operation cost and income of each planning scheme.The genetic algorithm based on elite strategy is used to find the optimal objective function value and corresponding planning scheme. At last the method is verified using a test system based on IEEE 33-bus system.
For distribution network with high proportion DC power and load,the AC-DC hybrid distribution network has the advantages of reducing energy conversion loss and improving power flow control ability and so on. The boundaries of AC and DC sub-networks in the hybrid distribution network can be determined by the location of converters. During the planning of AC-DC hybrid distribution network,using the converter locations as variables instead of using AC-DC configuration of every branches in the network can significantly reduce the number of variables and improve the solution efficiency. This paper proposed a sourcegrid coordinated converter location method for medium voltage AC-DC hybrid distribution network. Through the configuration of converter location,in terms of grid the AC and DC configuration of the network is determined,in terms of source the capacity allocation at each access point of photovoltaic and battery storage system is determined. In this paper,the annual profit of the distribution network including construction and operation two elements in the entire lifetime of equipment is chosen to be the objective function,and a mixed integer second order cone relaxed model is used to calculate the intraday operation cost and income of each planning scheme.The genetic algorithm based on elite strategy is used to find the optimal objective function value and corresponding planning scheme. At last the method is verified using a test system based on IEEE 33-bus system.
引文
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[17]马鑫,郭瑞鹏,王蕾,等.基于二阶锥规划的交直流主动配电网日前调度模型[J].电力系统自动化,2018,42(22):144-153.MA Xin,GUO Ruipeng,WANG Lei,et al.Day-ahead scheduling model for AC/DC active distribution network based on second-order cone programming[J].Automation of Electric Power Systems,2018,42(22):144-153.
[18]刘思宁,黄欲成,田甜.架空线路导线交直流电阻比的分析与研究[J].智慧电力,2018,46(5):91-95.LIU Sining,HUANG Yucheng,TIAN tian.Analysis on rate of AC-DC resistance in overhead conductor[J].Smart Power,2018,46(5):91-95.
[19]VARGA A.A descriptor systems toolbox for MATLAB[C]//IEEE International Symposium on Computer-Aided Control System Design,Sept.25-27,2000,Anchorage,AK,USA:150-155.
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[2]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):9-19,5.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):9-19,5.
[3]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.
[4]刘娇扬,郭力,杨书强,等.配电网中多光储微网系统的优化配置方法[J].电网技术,2018,42(9):2806-2813.LIU Jiaoyang,GUO Li,YANG Shuqiang,et al.Optimal sizing for multi PV-ESS microgrids in distribution network[J].Power System Technology,2018,42(9):2806-2813.
[5]马钊,焦在滨,李蕊.直流配电网络架构与关键技术[J].电网技术,2017,41(10):3348-3357.MA Zhao,JIAO Zaibin,LI Rui.Network structures and key technologies of DC distribution systems[J].Power System Technology,2017,41(10):3348-3357.
[6]盛万兴,李蕊,李跃,等.直流配电电压等级序列与典型网络架构初探[J].中国电机工程学报,2016,36(13):3391-3403,3358.SHENG Wanxing,LI Rui,LI Yue,et al.A preliminary study on voltage level sequence and typical network architecture of direct current distribution Network[J].Proceedings of the CSEE,2016,36(13):3391-3403,3358.
[7]李子韵.南京低压交直流混合微电网研究及试点应用[J].供用电,2015,32(10):32-37,50.LI Ziyun.Research and application of low voltage AC/DC hybrid microgrid in Nanjing[J].Distribution&Utilization,2015,32(10):32-37,50.
[8]刘国伟,赵宇明,袁志昌,等.深圳柔性直流配电示范工程技术方案研究[J].南方电网技术,2016,10(4):1-7.LIU Guowei,ZHAO Yuming,YUAN Zhichang,et al.Study on demonstration project technical scheme of VSC-DCdistribution system in Shenzhen[J].Southern Power System Technology,2016,10(4):1-7.
[9]李鹏,华浩瑞,陈安伟,等.基于二层规划模型的交直流混合微网源荷储协调分区优化经济调度[J].中国电机工程学报,2016,36(24):6769-6779,6931.LI Peng,HUA Haorui,CHEN Anwei,et al.Source-loadstorage coordination partition optimal economic operation of AC/DC hybrid microgrid based on bilevel programming model[J].Proceedings of the CSEE,2016,36(24):6769-6779,6931.
[10]杨堤,程浩忠,马则良,等.考虑静态和暂态电压稳定的交直流混联系统综合无功规划方法研究[J].中国电机工程学报,2017,37(11):3078-3086,3363.YANG Di,CHENG Haozhong,MA Zeliang,et al.Integrated reactive power planning methodology considering static and transient voltage stability for AC-DC hybrid system[J].Proceedings of the CSEE,2017,37(11):3078-3086,3363.
[11]AHMED H M A,ELTANTAWY A B,SALAMA M M A.A planning approach for the network configuration of AC-DChybrid distribution systems[J].IEEE Transactions on Smart Grid,2016:1.
[12]GHADIRI A,HAGHIFAM M R,MIRI LARIMI S M.Comprehensive approach for hybrid AC/DC distribution network planning using genetic algorithm[J].IET Generation,Transmission&Distribution,2017,11(16):3892-3902.
[13]雷婧婷,安婷,杜正春,等.含直流配电网的交直流潮流计算[J].中国电机工程学报,2016,36(4):911-918.LEI Jingting,AN Ting,DU Zhengchun,et al.A unified AC/DC power flow algorithm with DC distribution[J].Proceedings of the CSEE,2016,36(4):911-918.
[14]王成山.微电网分析与仿真理论[M].北京:科学出版社,2013:14-26.
[15]管敏渊,刘强,吴国强,等.基于模块级联拓扑的光伏智能并网系统[J].高电压技术,2015,41(10):3400-3406.GUAN Minyuan,LIU Qiang,WU Guoqiang,et al.Smart photovoltaic integration system sased on module cascaded converter topology[J].High Voltage Engineering,2015,41(10):3400-3406.
[16]MOLZAHN D K,DORFLER F,SANDBERG H,et al.Asurvey of distributed optimization and control algorithms for electric power systems[J].IEEE Transactions on Smart Grid,2017,8(6):2941-2962.
[17]马鑫,郭瑞鹏,王蕾,等.基于二阶锥规划的交直流主动配电网日前调度模型[J].电力系统自动化,2018,42(22):144-153.MA Xin,GUO Ruipeng,WANG Lei,et al.Day-ahead scheduling model for AC/DC active distribution network based on second-order cone programming[J].Automation of Electric Power Systems,2018,42(22):144-153.
[18]刘思宁,黄欲成,田甜.架空线路导线交直流电阻比的分析与研究[J].智慧电力,2018,46(5):91-95.LIU Sining,HUANG Yucheng,TIAN tian.Analysis on rate of AC-DC resistance in overhead conductor[J].Smart Power,2018,46(5):91-95.
[19]VARGA A.A descriptor systems toolbox for MATLAB[C]//IEEE International Symposium on Computer-Aided Control System Design,Sept.25-27,2000,Anchorage,AK,USA:150-155.
[20]DEB K,PRATAP A,AGARWAL S,et al.A fast and elitist multiobjective genetic algorithm:NSGA-II[J].IEEETransactions on Evolutionary Computation,2002,6(2):182-197.