基于连续潮流的配电网供电能力评估
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摘要
随着非全相运行的分布式电源大量接入配电网,配电网固有的三相不平衡特征更加突出,传统配电网供电能力评估因忽略配电网三相不平衡特征导致结果不准确。为了准确分析三相不平衡特征对配电网最大供电能力评估的影响,建立了以配电网供电负荷参数最大为目标函数,考虑了支路热约束和节点电压等状态变量和分布式电源的有功和无功功率等控制变量的含分布式电源三相不平衡配电网供电能力评估模型。选择电压跌落情况最严重的相作为连续参数,确保预测-校正过程的的连续潮流法求解的结果更加精确。最后,采用拓展的IEEE33节点配电系统进行仿真验证,表明文中所提的模型和求解方法是有效的。
The extensive penetration of open-phase running distributed generators such as photovoltaic generators to distribution systems may lead to a serious three-phase unbalanced condition,which is an intrinsic characteristic of distribution systems. The effect of the traditional evaluation of the power supply capability for distribution network is poor without considering the unbalanced problem. In order to accurately analyze the influence of unbalanced three-phase characteristics on the power supply capability for distribution network,the evaluation model of power supply capability for unbalanced three-phase distribution network with distributed generators is proposed,which takes the maximum load parameter of the distribution network as the objective function,considers the state variables such as branch thermal constraints and nodal voltage,and the control variables such as active and reactive power of the distribution power supply. The phase with the most serious voltage sag is selected as the continuous parameter to ensure the continuation power flow algorithm of prediction and correction is accurate. Finally,the simulation result of the modified IEEE 33-bus three-phase test system shows that the proposed model and method are effective.
The extensive penetration of open-phase running distributed generators such as photovoltaic generators to distribution systems may lead to a serious three-phase unbalanced condition,which is an intrinsic characteristic of distribution systems. The effect of the traditional evaluation of the power supply capability for distribution network is poor without considering the unbalanced problem. In order to accurately analyze the influence of unbalanced three-phase characteristics on the power supply capability for distribution network,the evaluation model of power supply capability for unbalanced three-phase distribution network with distributed generators is proposed,which takes the maximum load parameter of the distribution network as the objective function,considers the state variables such as branch thermal constraints and nodal voltage,and the control variables such as active and reactive power of the distribution power supply. The phase with the most serious voltage sag is selected as the continuous parameter to ensure the continuation power flow algorithm of prediction and correction is accurate. Finally,the simulation result of the modified IEEE 33-bus three-phase test system shows that the proposed model and method are effective.
引文
[1]李振坤,陈星莺,刘皓明,等.配电网供电能力的实时评估分析[J].电力系统自动化,2009,33(6):36-40.LI Zhenkun,CHEN Xingying,LIU Haoming,et al. Online assessment of distribution network loading capability[J]. Automation of Electric Power System,2009,33(6):36-40.
[2]GARVERL L,VAN HORNE P R,WIRGAU K A. Load supplying capability of generation-transmission networks[J]. IEEE Transactions on Power Apparatus and Systems,1979,98(3):957-962.
[3]邱丽萍,范明天.城市电网最大供电能力评价算法[J].电网技术,2006,30(9):68-71.QIU Liping,FAN Mingtian. A new algorithm to evaluate maximum power supply capability of urban distribution network[J].Power System Technology,2006,30(9):68-71.
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[5]曹文远,韩民晓,谢文强,等.城市配网改造下中压直流配电网的供电能力分析[J].现代电力,2018,35(2):56-63.CAO Wenyuan,HAN Minxiao,XIE Wenqiang,et al. Research on the power supply capability of medium voltage DC distribution network in urban distribution network transformation[J]. Modern Electric Power,2018,35(2):56-63.
[6]李红军,李敬如,杨卫红.基于信赖域法的城市电网供电能力充裕度评估[J].电网技术,2010,34(8):92-96.LI Hongjun,LI Jingru,YANG Weihong. Assessment of urban power network power supply capability by trust region method[J]. Power System Technology,2010,34(8):92-96.
[7]乐文海,何春林,郑正仙,等.国内电动汽车充换电设施标准体系[J].浙江电力,2017,36(3):5-8.LE Wenhai,HE Chunlin,ZHENG Zhengxian,et al. Domestic standard system for electric vehicle charging and batteryswapping facilities[J]. Zhejiang Electric Power,2017,36(3):5-8.
[8]韩霄汉,胡小寒,姚力,等.竞争性电力市场背景下电能计量发展趋势的思考[J].浙江电力,2017,36(3):30-33.HAN Xiaohan,HU Xiaohan,YAO Li,et al. Reflection on development trend of electric energy metering in competitive electricity market[J]. Zhejiang Electric Power,2017,36(3):30-33.
[9]贺春,陈卓,冯瑾涛,等.电动汽车充电安全分析与解决方案[J].供用电,2017,34(1):12-18,50.HE Chun,CHEN Zhuo,FENG Jintao,et al. Analysis and solution on the safety of electric vehicle charging[J]. Distribution&Utilization,2017,34(1):12-18,50.
[10]吾喻明,钱立军,江明.基于互联互通的电动汽车充电设施标准优化设计[J].供用电,2017,34(1):8-11.WU Yuming,QIAN Lijun,JIANG Ming. Standard optimization design of electric vehicle charging infrastructure based on interconnection[J]. Distribution&Utilization,2017,34(1):8-11.
[11]刘一兵,吴文传,张伯明,等.基于有功-无功协调优化的主动配电网过电压预防控制方法[J].电力系统自动化,2014,38(9):184-191.LIU Yinbing,WU Wenchaun,ZHANG Boming,et al. Overvoltage preventive control method based on active and reactive power coordinated optimization in active distribution network[J]. Automation of Electric Power System,2014,38(9):184-191.
[12]丁明,郭学凤.含多种分布式电源的弱环配电网三相潮流计算[J].中国电机工程学报,2009,29(13):35-40.DING Ming,GUO Xuefeng. Three-phase power flow for the weakly meshed distribution network with the distributed generation[J]. Proceedings of the CSEE,2009,29(13):35-40.
[13]王守相,黄丽娟,王成山,等.分布式发电系统的不平衡三相潮流计算[J].电力自动化设备,2007,27(8):11-15.WANG Shouxiang,HUANG Lijuan,WANG Chenshan,et al.Unbalanced three-phase power flow calculation for distribution power generation system[J]. Electric Power Automation Equipment,2007,27(8):11-15.
[14] COLEMAN N S,MIU K N. Distribution load capability with nodal power factor constraints[J]. IEEE Transactions on Power Systems,2017,32(4):3120-3126.
[15]赵晋泉,范晓龙,高宗和,等.含分布式电源的三相不平衡配电网连续潮流计算[J].电力系统自动化,2015,39(9):48-53.ZHAO Jinquan,FAN Xiaolong,GAO Zonghe,et al. Continuation power flow calculation for unbalanced three-phase distribution networks with distributed generators[J]. Automation of Electric Power System,2015,39(9):48-53.
[16]董晓明,梁军,韩学山,等.连续潮流参数选择及步长控制的分析与改进[J].电力系统自动化,2011,35(13):49-54.DONG Xiaoming,LIANG Jun,HAN Xueshan,et al. Analysis and improvement on parameter selection strategy and step size controlling in continuation power flow[J]. Automation of Electric Power System,2011,35(13):49-54.
[17]杨杉,同向前.考虑分布式电源限流作用的主动配电网连续潮流计算[J].电力自动化设备,2017,37(10):57-62.YANG Shan,TONG Xiangqian. Continuous power flow calculation for active distribution network with consideration of current limitation of distributed generation[J]. Electric Power Automation Equipment,2017,37(10):57-62.
[18]王振浩,由作宇,黄亚磊,等.基于连续潮流法的含双端VSC-HVDC交直流系统负荷裕度分析[J].电力系统保护与控制,2018,46(6):9-15.WANG Zhenhao,YOU Zuoyu,HUANG Yalei,et al. Load margin analysis of hybrid AC/DC system with two terminal VSC-HVDC using continuous power flow method[J]. Power System Protection and Control,2018,46(6):9-15.
[19]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,2003,23(1):74-79.CHE Renfei,LI Renjun. A new three-phase power flow method for weakly meshed distribution systems[J]. Proceedings of the CSEE,2003,23(1):74-79.
[2]GARVERL L,VAN HORNE P R,WIRGAU K A. Load supplying capability of generation-transmission networks[J]. IEEE Transactions on Power Apparatus and Systems,1979,98(3):957-962.
[3]邱丽萍,范明天.城市电网最大供电能力评价算法[J].电网技术,2006,30(9):68-71.QIU Liping,FAN Mingtian. A new algorithm to evaluate maximum power supply capability of urban distribution network[J].Power System Technology,2006,30(9):68-71.
[4]束洪春,胡泽江,刘宗兵.城市电网最大供电能力在线评估方法及其应用[J].电网技术,2008,32(9):46-50.SHU Hongchun,HU Zejiang,LIU Zongbing. Online evaluation of utmost power supply ability of urban power system and its application[J]. Power System Technology,2008,32(9):46-50.
[5]曹文远,韩民晓,谢文强,等.城市配网改造下中压直流配电网的供电能力分析[J].现代电力,2018,35(2):56-63.CAO Wenyuan,HAN Minxiao,XIE Wenqiang,et al. Research on the power supply capability of medium voltage DC distribution network in urban distribution network transformation[J]. Modern Electric Power,2018,35(2):56-63.
[6]李红军,李敬如,杨卫红.基于信赖域法的城市电网供电能力充裕度评估[J].电网技术,2010,34(8):92-96.LI Hongjun,LI Jingru,YANG Weihong. Assessment of urban power network power supply capability by trust region method[J]. Power System Technology,2010,34(8):92-96.
[7]乐文海,何春林,郑正仙,等.国内电动汽车充换电设施标准体系[J].浙江电力,2017,36(3):5-8.LE Wenhai,HE Chunlin,ZHENG Zhengxian,et al. Domestic standard system for electric vehicle charging and batteryswapping facilities[J]. Zhejiang Electric Power,2017,36(3):5-8.
[8]韩霄汉,胡小寒,姚力,等.竞争性电力市场背景下电能计量发展趋势的思考[J].浙江电力,2017,36(3):30-33.HAN Xiaohan,HU Xiaohan,YAO Li,et al. Reflection on development trend of electric energy metering in competitive electricity market[J]. Zhejiang Electric Power,2017,36(3):30-33.
[9]贺春,陈卓,冯瑾涛,等.电动汽车充电安全分析与解决方案[J].供用电,2017,34(1):12-18,50.HE Chun,CHEN Zhuo,FENG Jintao,et al. Analysis and solution on the safety of electric vehicle charging[J]. Distribution&Utilization,2017,34(1):12-18,50.
[10]吾喻明,钱立军,江明.基于互联互通的电动汽车充电设施标准优化设计[J].供用电,2017,34(1):8-11.WU Yuming,QIAN Lijun,JIANG Ming. Standard optimization design of electric vehicle charging infrastructure based on interconnection[J]. Distribution&Utilization,2017,34(1):8-11.
[11]刘一兵,吴文传,张伯明,等.基于有功-无功协调优化的主动配电网过电压预防控制方法[J].电力系统自动化,2014,38(9):184-191.LIU Yinbing,WU Wenchaun,ZHANG Boming,et al. Overvoltage preventive control method based on active and reactive power coordinated optimization in active distribution network[J]. Automation of Electric Power System,2014,38(9):184-191.
[12]丁明,郭学凤.含多种分布式电源的弱环配电网三相潮流计算[J].中国电机工程学报,2009,29(13):35-40.DING Ming,GUO Xuefeng. Three-phase power flow for the weakly meshed distribution network with the distributed generation[J]. Proceedings of the CSEE,2009,29(13):35-40.
[13]王守相,黄丽娟,王成山,等.分布式发电系统的不平衡三相潮流计算[J].电力自动化设备,2007,27(8):11-15.WANG Shouxiang,HUANG Lijuan,WANG Chenshan,et al.Unbalanced three-phase power flow calculation for distribution power generation system[J]. Electric Power Automation Equipment,2007,27(8):11-15.
[14] COLEMAN N S,MIU K N. Distribution load capability with nodal power factor constraints[J]. IEEE Transactions on Power Systems,2017,32(4):3120-3126.
[15]赵晋泉,范晓龙,高宗和,等.含分布式电源的三相不平衡配电网连续潮流计算[J].电力系统自动化,2015,39(9):48-53.ZHAO Jinquan,FAN Xiaolong,GAO Zonghe,et al. Continuation power flow calculation for unbalanced three-phase distribution networks with distributed generators[J]. Automation of Electric Power System,2015,39(9):48-53.
[16]董晓明,梁军,韩学山,等.连续潮流参数选择及步长控制的分析与改进[J].电力系统自动化,2011,35(13):49-54.DONG Xiaoming,LIANG Jun,HAN Xueshan,et al. Analysis and improvement on parameter selection strategy and step size controlling in continuation power flow[J]. Automation of Electric Power System,2011,35(13):49-54.
[17]杨杉,同向前.考虑分布式电源限流作用的主动配电网连续潮流计算[J].电力自动化设备,2017,37(10):57-62.YANG Shan,TONG Xiangqian. Continuous power flow calculation for active distribution network with consideration of current limitation of distributed generation[J]. Electric Power Automation Equipment,2017,37(10):57-62.
[18]王振浩,由作宇,黄亚磊,等.基于连续潮流法的含双端VSC-HVDC交直流系统负荷裕度分析[J].电力系统保护与控制,2018,46(6):9-15.WANG Zhenhao,YOU Zuoyu,HUANG Yalei,et al. Load margin analysis of hybrid AC/DC system with two terminal VSC-HVDC using continuous power flow method[J]. Power System Protection and Control,2018,46(6):9-15.
[19]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,2003,23(1):74-79.CHE Renfei,LI Renjun. A new three-phase power flow method for weakly meshed distribution systems[J]. Proceedings of the CSEE,2003,23(1):74-79.