基于潮流及短路计算的电力系统Ward等值实现方法
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摘要
对电力系统进行电磁暂态计算,需搭建原系统的等值模型。在电力市场环境下,由于商业机密,相关从业人员可能不具有电力系统外部网络信息,或不具备对大型电力系统进行等值的软件模块,这给工程计算带来了困难。针对这一问题,提出一种基于潮流和短路计算的电力系统Ward等值实现方法。首先将内部网络流向边界节点的电流作为边界节点的等效注入电流,进而对边界节点进行短路电流计算,获得相应的短路电流和节点电压,最后通过节点电压方程求解等值系统参数。理论和实际系统算例分析表明,该方法具有极高的准确性。
To perform electromagnetic transient calculation on power systems, the equivalent simplification of original system should be carried out. In the electricity market environment, due to trade secrets, the relevant practitioners may not have external network information, or do not have software modules for equivalent simplification of large-scale power system, which brings difficulties to engineering calculation. A method to implement Ward equivalent based on power flow calculation and short circuit calculation is proposed. First, the currents from internal network to boundary nodes are treated as equivalent injection currents of boundary nodes. Then the node voltages and short-circuit currents are obtained by short-circuit current calculation of the boundary nodes of original system. Finally, the equivalent system parameters are calculated by node voltage equation. Theoretical analyses and results of an actual system simulation show that this method has high accuracy.
To perform electromagnetic transient calculation on power systems, the equivalent simplification of original system should be carried out. In the electricity market environment, due to trade secrets, the relevant practitioners may not have external network information, or do not have software modules for equivalent simplification of large-scale power system, which brings difficulties to engineering calculation. A method to implement Ward equivalent based on power flow calculation and short circuit calculation is proposed. First, the currents from internal network to boundary nodes are treated as equivalent injection currents of boundary nodes. Then the node voltages and short-circuit currents are obtained by short-circuit current calculation of the boundary nodes of original system. Finally, the equivalent system parameters are calculated by node voltage equation. Theoretical analyses and results of an actual system simulation show that this method has high accuracy.
引文
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[16]李世明.基于内网实测信息的两端互联电网静态等值参数估计方法研究[D].重庆:重庆大学, 2011.LI Shiming. Research on parameter estimation method of two-portinterconnectedgridexternalnetworkstatic equivalentparameteronthebasisofinternalnetwork measuredinformation[D].Chongqing:Chongqing University, 2011.
[17]吴际舜.电力系统静态安全分析[M].上海:上海交通大学出版社, 1985.
[18]刘小波,丁晓群,龙启峰,等.基于Ward等值的二级电压控制研究[J].电网技术, 2005, 29(12):53-56.LIU Xiaobo, DING Xiaoqun, LONG Qifeng, et al. Study on secondary voltage control based on ward equivalent[J].Power System Technology, 2005, 29(12):53-56.
[19]BALDWIN T L, MILI L, PHADKE A G. Dynamic ward equivalentsfortransientstabilityanalysis[J].IEEE Transactions on Power Systems, 1994, 9(1):59-67.
[20]颜伟,李世明,陈俊,等.基于内网实测信息的两端口外网静态等值参数估计方法[J].中国电机工程学报,2011, 31(13):101-106.YANWei,LIShiming,CHENJun,etal.Parameter estimation for two-port external network static equivalent modelonthebasisofinternalnetworkmeasured information[J]. Proceedings of theCSEE, 2011, 31(13):101-106.
[21]居余马,胡金德,林翠琴,等.线性代数[M].2版.北京:清华大学出版社, 2002.
[22]张媛媛,班连庚,项祖涛,等. 1 000 kV特高压固定串联补偿装置关键元件工作条件研究[J].电网技术,2013, 37(8):2218-2224.ZHANG Yuanyuan, BAN Liangeng, XIANG Zutao, et al.Researchonworkingconditionofkeycomponentsfor fixed series compensation in 1 000 kV UHV AC power transmission project[J]. Power System Technology, 2013,37(8):2218-2224.
[23]袁敬中.大房500 kV串联补偿站控制与保护[J].电力系统自动化, 2002, 26(11):66-69.YUAN Jingzhong. The control and protection system for defang 500 kV transmission line series compensation[J].AutomationofElectricPowerSystems,2002,26(11):66-69.
[2]徐玉琴,刘丹丹.基于两步分群法的双馈机组风电场等值建[J].电力系统保护与控制, 2017, 45(6):108-114.XU Yuqin, LIU Dandan. Equivalence of wind farms with DFIGbasedontwo-stepclusteringmethod[J].Power System Protection and Control, 2017, 45(6):108-114.
[3]李健,李栋.电网静态等值方法的综合分析与评价[J].电气应用, 2006, 25(9):97-101, 146.LI Jian, LI Dong. Analysis and review of static network reductionapproaches[J].ElectrotechnicalApplication,2006, 25(9):97-101, 146.
[4]刘多多.电网静态等值及其效果评价方法的研究[D].济南:山东大学, 2010.LIUDuoduo.Studiesonstaticequivalentofpower systemanditsevaluationmethod[D].Jinan:Shandong University, 2010.
[5]吴海霞.基于PSS/E的适用于电磁暂态仿真的动态等值方法研究[D].杭州:浙江大学, 2010.
[6]徐政,杨靖萍,段慧.一种适用于电磁暂态仿真的等值简约方法[J].南方电网技术, 2007, 1(1):37-40.XU Zheng, YANG Jingping, DUAN Hui. An equivalent reductionmethodforelectromagnetictransient simulationoflarge-scalepowersystems[J].Southern Power System Technology, 2007, 1(1):37-40.
[7]胡国文,王仲鸿,程明.与伊-冯输电线路相连电网的等值简化与仿真研究[J].电网技术, 2005, 29(9):5-9.HUGuowen,WANGZhonghong,CHENGMing.Equivalentsimplificationandemulationresearchon power network connected to Yimin-Fengtun transmission line[J]. Power System Technology, 2005, 29(9):5-9.
[8]WUFF,MONTICELLIA.Criticalreviewofexternal networkmodellingforonlinesecurityanalysis[J].Electric Power and Energy Systems, 1983, 5(4):222-235.
[9]楼霞薇,王威,王波.基于WARD等值的电网限流运行方式优化方法[J].电力系统保护与控制,2017,45(18):128-136.LOU Xiawei, WANG Wei, WANG Bo. A grid operation modeoptimizationmethodforcontrollingshort-circuit currentlevelbasedonWARDequivalence[J].Power System Protection and Control, 2017, 45(18):128-136.
[10]殷自力,陈宇星.基于功率传输转移分布因子的简化电网潮流计算方法[J].电力系统保护与控制,2016,44(17):25-30.YINZili,CHENYuxing.Apowerflowcomputation methodforreductiongridbasedonpowertransfer distributionfactor[J].PowerSystemProtectionand Control, 2016, 44(17):25-30.
[11]文明浩,杨帆.基于PSASP短路计算的区域电网等值方法[J].电网技术, 2012, 36(1):113-117.WEN Minghao, YANG Fan. An equivalence method of regional power network based on short circuit calculation bypowersystemanalysissoftwarepackage[J].Power System Technology, 2012, 36(1):113-117.
[12]林济铿,闫贻鹏,刘涛,等.电力系统电磁暂态仿真外部系统等值方法综述[J].电力系统自动化,2012,36(11):108-115.LINJikeng,YANYipeng,LIUTao,etal.Reviewon externalsystemequivalentmethodforelectromagnetic transient simulation of power systems[J]. Automation of Electric Power Systems, 2012, 36(11):108-115.
[13]刘绪斌,王良,闫有朋.电力系统静态等值改进算法的研究[J].华北电力技术, 2010, 30(3):1-5.LIUXubin,WANGLiang,YANYoupeng.Studieson improved method of power system static equivalence[J].North China Electric Power, 2010, 30(3):1-5.
[14]WARD J B. Equivalent circuits for power-flow studies[J].Electrical Engineering, 1949, 68(9):373-382.
[15]李世明,卢建刚,郭文鑫,等.基于内网常规Ward等值电路的外网静态等值法[J].电力与能源, 2013, 34(6):575-579.LI Shiming, LU Jiangang, GUO Wenxin, et al. External network static equivalent on the basis of internal general wardequivalentcircuit[J].PowerandEnergy,2013,34(6):575-579.
[16]李世明.基于内网实测信息的两端互联电网静态等值参数估计方法研究[D].重庆:重庆大学, 2011.LI Shiming. Research on parameter estimation method of two-portinterconnectedgridexternalnetworkstatic equivalentparameteronthebasisofinternalnetwork measuredinformation[D].Chongqing:Chongqing University, 2011.
[17]吴际舜.电力系统静态安全分析[M].上海:上海交通大学出版社, 1985.
[18]刘小波,丁晓群,龙启峰,等.基于Ward等值的二级电压控制研究[J].电网技术, 2005, 29(12):53-56.LIU Xiaobo, DING Xiaoqun, LONG Qifeng, et al. Study on secondary voltage control based on ward equivalent[J].Power System Technology, 2005, 29(12):53-56.
[19]BALDWIN T L, MILI L, PHADKE A G. Dynamic ward equivalentsfortransientstabilityanalysis[J].IEEE Transactions on Power Systems, 1994, 9(1):59-67.
[20]颜伟,李世明,陈俊,等.基于内网实测信息的两端口外网静态等值参数估计方法[J].中国电机工程学报,2011, 31(13):101-106.YANWei,LIShiming,CHENJun,etal.Parameter estimation for two-port external network static equivalent modelonthebasisofinternalnetworkmeasured information[J]. Proceedings of theCSEE, 2011, 31(13):101-106.
[21]居余马,胡金德,林翠琴,等.线性代数[M].2版.北京:清华大学出版社, 2002.
[22]张媛媛,班连庚,项祖涛,等. 1 000 kV特高压固定串联补偿装置关键元件工作条件研究[J].电网技术,2013, 37(8):2218-2224.ZHANG Yuanyuan, BAN Liangeng, XIANG Zutao, et al.Researchonworkingconditionofkeycomponentsfor fixed series compensation in 1 000 kV UHV AC power transmission project[J]. Power System Technology, 2013,37(8):2218-2224.
[23]袁敬中.大房500 kV串联补偿站控制与保护[J].电力系统自动化, 2002, 26(11):66-69.YUAN Jingzhong. The control and protection system for defang 500 kV transmission line series compensation[J].AutomationofElectricPowerSystems,2002,26(11):66-69.