综合灵敏度和静态电压稳定裕度的直流受端交流系统电压薄弱区域评估方法
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摘要
提出综合无功-电压灵敏度与静态电压稳定裕度的直流受端交流系统电压薄弱区域评估方法,并在灵敏度及静态电压稳定计算中计及了负荷静态电压特性。以计及负荷静态电压特性的交直流电力系统潮流方程为基础,计算交流节点电压相对于直流落点无功功率的灵敏度;基于连续潮流法,计算计及负荷静态电压特性的直流受端交流系统静态电压稳定裕度,综合这2个指标识别电压薄弱区域。并进一步地比较了不同ZIP负荷占比、不同直流控制方式对直流落点近区交流系统电压薄弱区域评估的影响。
A method for evaluating voltage weak area of AC power system at DC receiving end considering both reactive-voltage sensitivity and static voltage stability margin is proposed,and the static voltage characteristics of load are considered during the calculation of sensitivity and static voltage stability. Firstly,the sensitivity of voltage at AC node to reactive power at DC node is calculated based on power flow equation of AC/DC power system,in which the load static voltage characteristics of load are considered. Secondly,the static voltage stability margin considering the load static voltage characteristics is calculated based on the continuation power flow. Finally,the voltage weak area of AC power system at DC receiving end is evaluated by reactive-voltage sensitivity combing with static voltage stability margin. Furthermore,the effects of different ZIP load ratios and DC control ways on evaluating voltage weak area of AC power system at DC receiving end are compared.
A method for evaluating voltage weak area of AC power system at DC receiving end considering both reactive-voltage sensitivity and static voltage stability margin is proposed,and the static voltage characteristics of load are considered during the calculation of sensitivity and static voltage stability. Firstly,the sensitivity of voltage at AC node to reactive power at DC node is calculated based on power flow equation of AC/DC power system,in which the load static voltage characteristics of load are considered. Secondly,the static voltage stability margin considering the load static voltage characteristics is calculated based on the continuation power flow. Finally,the voltage weak area of AC power system at DC receiving end is evaluated by reactive-voltage sensitivity combing with static voltage stability margin. Furthermore,the effects of different ZIP load ratios and DC control ways on evaluating voltage weak area of AC power system at DC receiving end are compared.
引文
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[14]王云鹏,韩学山,孙东磊,等.考虑直流输电控制方式的受端电网电压稳定性机理分析[J].电力系统自动化,2016,40(6):35-41.WANG Yunpeng,HAN Xueshan,SUN Donglei,et al. Analysis on voltage stability of receiving grid considering control strategy of DC transmission line[J]. Automation of Electric Power Systems,2016,40(6):35-41.
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[16]傅旭,付翀丽,黄明良.负荷静态特性对节点静态电压稳定性影响规律的分析[J].智能电网,2015,3(7):587-593.FU Xu,FU Chongli,HUANG Mingliang. Studies of the effect of load static characteristics on node static voltage stability[J]. Smart Grid,2015,3(7):587-593.
[17]李欣然,贺仁睦,章健,等.负荷特性对电力系统静态电压稳定性的影响及静态电压稳定性广义实用判据[J].中国电机工程学报,1999,19(4):27-31.LI Xinran,HE Renmu,ZHANG Jian,et al. Effect of load characteristics on power system stead-state voltage stability and the practical criterion of voltage stability[J]. Proceedings of the CSEE,1999,19(4):27-31.
[18]高鹏,石立宝,姚良忠,等.辨识电网薄弱节点的多准则综合电压稳定指标[J].电网技术,2009,33(19):26-31.GAO Peng,SHI Libao,YAO Liangzhong,et al. A multi-criterion integrated voltage stability index for weak buses identification[J].Power System Technology,2009,33(19):26-31.
[19]燕思旻,沈沉,王雅婷.基于Levenberg-Marquardt算法的大规模系统无功补偿决策方法[J].中国电机工程学报,2016,36(18):4864-4872,5110.YAN Simin,SHEN Chen,WANG Yating. Levenberg-Marguardt algorithm based VAR compensation method for large-scale power systems[J]. Proceedings of the CSEE,2016,36(18):4864-4872,5110.
[20]张尧,宋文南.节点电压稳定临界状态和弱节点的确定[J].中国电机工程学报,1993,13(6):40-45.ZHANG Yao,SONG Wennan. Determinaiton of the critical state of voltage stability and the weakest bus of the power system[J]. Proceedings of the CSEE,1993,13(6):40-45.
[2]吴萍,徐式蕴,赵兵,等.面向风火打捆的特高压直流输电工程弱送端强直弱交耦合特性研究[J].电力自动化设备,2016,36(1):60-66.WU Ping,XU Shiyun,Zhao Bing,et al. Research of weak sendingend coupling characteristics for bundled wind-thermal power transmission of UHVDC project[J]. Electric Power Automation Equipment,2016,36(1):60-66.
[3]李妮,李兴源,冯明,等.改善多馈入直流系统电压无功特性的直流控制策略[J].电力自动化设备,2016,36(2):25-31.LI Ni,LI Xingyuan,FENG Ming,et al. DC control for improving voltage and reactive power characteristics of multi-infeed HVDC system[J]. Electric Power Automation Equipment,2016,36(2):25-31.
[4]徐政.交直流电力系统动态行为分析[M].北京:机械工业出版社,2004:67-71.
[5]段献忠,袁骏,何仰赞,等.电力系统电压稳定灵敏度分析方法[J].电力系统自动化,1997,21(4):9-12.DUAN Xianzhong,YUAN Jun,HE Yangzan,et al. Sensitivity analysis methods on voltage stability of electric power systems[J]. Automation of Electric Power Systems,1997,21(4):9-12.
[6]刘崇茹,张伯明.交直流混合输电系统灵敏度分析[J].电力系统自动化,2007,31(12):45-49.LIU Chongru,ZHANG Boming. A sensitivity analysis for AC/DC hybrid power systems[J]. Automation of Electric Power Systems,2007,31(12):45-49.
[7]苗峰显,蔡忠勤,郭志忠.考虑负荷静态特性中负荷间关联的灵敏度计算[J].电网技术,2008,32(15):52-55,61.MIAO Fengxian,CAI Zhongqin,GUO Zhizong. Sensitivity calculation considering load interdependence in static characteristics of loads[J]. Power System Technology,2008,32(15):52-55,61.
[8]刘崇茹,张伯明.考虑换流变压器和无功补偿协调控制计算AC/DC系统有功-电压曲线[J].电力自动化设备,2009,29(1):50-53.LIU Chongru,ZHANG Boming. Calculation of power-voltage curve for AC/DC hybrid power system considering converter transformer tap change and reactive power compensation[J]. Electric Power Automation Equipment,2009,29(1):50-53.
[9]肖浩,李银红,段献忠,等.计及LCC-HVDC交直流系统静态电压稳定的综合短路比强度指标[J].中国电机工程学报,2017,37(14):4008-4017.XIAO Hao,LI Yinhong,DUAN Xianzhong,et al. Intrgrated short circuit ratio strength index based on the static voltage stability of the LCCHVDC systems[J]. Proceedings of the CSEE,2017,37(14):4008-4017.
[10]陈厚合,黄亚磊,姜涛,等.含VSC-HVDC的交直流系统电压稳定分析与控制[J].电网技术,2017,41(8):2429-2435.CHEN Houhe,HUANG Yalei,JIANG Tao,et al. Voltage stability analysis and control for AC/DC systems with VSC-HVDC[J].Power System Technology,2017,41(8):2429-2435.
[11]胡林献,陈学允.崩溃点法交直流联合系统电压稳定性分析[J].中国电机工程学报,1997,17(6):395-398.HU Linxian,CHEN Xueyun. Point of collapse method applied to voltage stability analysis of AC/DC power system[J]. Proceedings of the CSEE,1997,17(6):395-398.
[12]李兴源,王秀英.基于静态等值和奇异值分解的快速电压稳定性分析方法[J].中国电机工程学报,2003,23(4):1-4.LI Xingyuan,WANG Xiuying. Fast voltage stability analysis methods based on static equivalence and singular value resolution[J]. Proceedings of the CSEE,2003,23(4):1-4.
[13]刘晓明,慈文斌,刘玉田.直流控制方式对受端电网电压稳定性影响[J].电力自动化设备,2011,31(4):69-73.LIU Xiaoming,CI Wenbin,LIU Yutian. Influences of DC system control mode on voltage stability of receiving-end power grid[J]. Electric Power Automation Equipment,2011,31(4):69-73.
[14]王云鹏,韩学山,孙东磊,等.考虑直流输电控制方式的受端电网电压稳定性机理分析[J].电力系统自动化,2016,40(6):35-41.WANG Yunpeng,HAN Xueshan,SUN Donglei,et al. Analysis on voltage stability of receiving grid considering control strategy of DC transmission line[J]. Automation of Electric Power Systems,2016,40(6):35-41.
[15]赵晋泉,王毅,李可文,等.一种基于连续潮流的在线静态稳定综合评估方法[J].电力系统自动化,2010,34(4):18-22,28.ZHAO Jinquan,WANG Yi,LI Kewen,et al. An on-line voltage stability composite assessment method based on continuation power flow[J]. Automation of Electric Power Systems,2010,34(4):18-22,28.
[16]傅旭,付翀丽,黄明良.负荷静态特性对节点静态电压稳定性影响规律的分析[J].智能电网,2015,3(7):587-593.FU Xu,FU Chongli,HUANG Mingliang. Studies of the effect of load static characteristics on node static voltage stability[J]. Smart Grid,2015,3(7):587-593.
[17]李欣然,贺仁睦,章健,等.负荷特性对电力系统静态电压稳定性的影响及静态电压稳定性广义实用判据[J].中国电机工程学报,1999,19(4):27-31.LI Xinran,HE Renmu,ZHANG Jian,et al. Effect of load characteristics on power system stead-state voltage stability and the practical criterion of voltage stability[J]. Proceedings of the CSEE,1999,19(4):27-31.
[18]高鹏,石立宝,姚良忠,等.辨识电网薄弱节点的多准则综合电压稳定指标[J].电网技术,2009,33(19):26-31.GAO Peng,SHI Libao,YAO Liangzhong,et al. A multi-criterion integrated voltage stability index for weak buses identification[J].Power System Technology,2009,33(19):26-31.
[19]燕思旻,沈沉,王雅婷.基于Levenberg-Marquardt算法的大规模系统无功补偿决策方法[J].中国电机工程学报,2016,36(18):4864-4872,5110.YAN Simin,SHEN Chen,WANG Yating. Levenberg-Marguardt algorithm based VAR compensation method for large-scale power systems[J]. Proceedings of the CSEE,2016,36(18):4864-4872,5110.
[20]张尧,宋文南.节点电压稳定临界状态和弱节点的确定[J].中国电机工程学报,1993,13(6):40-45.ZHANG Yao,SONG Wennan. Determinaiton of the critical state of voltage stability and the weakest bus of the power system[J]. Proceedings of the CSEE,1993,13(6):40-45.