基于支路方程解存在性的局部电压稳定指标
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摘要
快速精准地辨识电网电压薄弱节点并执行相应的控制措施,是预防电力系统电压失稳的一项重要工作。首先,在原有电力系统电压稳定局部指标L指标的基础上,通过对Ⅱ型等值支路模型列写潮流方程,考虑支路潮流方程解存在性的原理推导出静态电压稳定L_q指标和L_p指标。然后分析了L_q指标和L_p指标的不足,通过列写支路电压方程,考虑支路电压方程解存在性原理改造得到改进指标L_(pqu)。最后,本文分析了2种支路方程下所提指标的优劣,结合了支路潮流方程和支路电压方程,提出一种基于支路方程可行解域的电压稳定L_(u.p)指标,使其可以快速识别系统中的薄弱支路。以新疆某地区实际电网为例,分析验证了所提指标对电网薄弱点快速识别的精确度和线性程度,对调度人员可以快速准确识别系统中电压薄弱节点具有重要的指导意义。
It is an important task for the prevention of voltage instability of the power system to identify the weak nodes of grid and take corresponding quick and accurate control measures. First of all,the static voltage stability L_q and L_P index are deduced on the basis of L index of voltage stability local index of original power system and through writing on the PI equivalent branch power flow equation model and also with consideration of existence principle of branch flow equation. Then,the deficiency of the L_q and L_P index is analyzed. The improvement index L_(pqu) is obtained through writing branch voltage equation and considering modification of existence principle of branch voltage equation solution. Finally,the advantage and disadvantage of the proposed index under two kinds of branch equation are analyzed, the voltage stability L_(u.p) index based on a kind of branch equation solution is proposed with combination of the branch flow equation and branch voltage equation so to keep them identify the weak branch of the system. In this paper,an actual power network at certain area of Xinjiang is taken as an example to analyze and verify the fast identification ccuracy and linearity of the proposed index to the weak point of power network and has a guidance significance of the dispatching personnel in fast and accurate identifying the weak point of the voltage of the system.
It is an important task for the prevention of voltage instability of the power system to identify the weak nodes of grid and take corresponding quick and accurate control measures. First of all,the static voltage stability L_q and L_P index are deduced on the basis of L index of voltage stability local index of original power system and through writing on the PI equivalent branch power flow equation model and also with consideration of existence principle of branch flow equation. Then,the deficiency of the L_q and L_P index is analyzed. The improvement index L_(pqu) is obtained through writing branch voltage equation and considering modification of existence principle of branch voltage equation solution. Finally,the advantage and disadvantage of the proposed index under two kinds of branch equation are analyzed, the voltage stability L_(u.p) index based on a kind of branch equation solution is proposed with combination of the branch flow equation and branch voltage equation so to keep them identify the weak branch of the system. In this paper,an actual power network at certain area of Xinjiang is taken as an example to analyze and verify the fast identification ccuracy and linearity of the proposed index to the weak point of power network and has a guidance significance of the dispatching personnel in fast and accurate identifying the weak point of the voltage of the system.
引文
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[13]韩琪,余贻鑫,贾宏杰,等.静态电压稳定域边界的非线性近似解析表达[J].电力系统自动化,2005,29(11):10-14.HAN Qi,YU Yixin,JIA Hongjie,et al.Analytical forms of boundaries of static voltage stability region with nonlinear terms[J].Automation of Electric Power Systems,2005,29(11):10-14.
[14]刘娅.变电站无功补偿分析[J].电力电容器与无功补偿,2009,30(6):19-22.LIU Ya.Analysis on the reactive power compensation of substation[J].Power Capacitor&Reactive Power Compensation,2009,30(6):19-22.
[15]姜涛,陈厚合,李国庆.基于局部电压稳定指标的电压/无功分区调节方法[J].电网技术,2012,36(7):207-213.JIANG Tao,CHEN Houge,LI Guoqing.A new algorithm for partitioned regulation of voltage and reactive power in power system utilizing local voltage stability index[J].Power System Technology,2012,36(7):207-213.
[16]徐琳,卢继平,汪洋,等.电力系统节点电压稳定指标的研究[J].电网技术,2010,34(3):26-30.XU Lin,LU Jiping,WANG Yang,et al.Research on nodal voltage stability index of power system[J].Power System Technology,2010,34(3):26-30.
[2]赵金利,余贻鑫.电力系统电压稳定分区和关键断面的确定[J].电力系统自动化,2008,32(17):1-5.ZHAO Jinli,YU Yixin.Determination of power system voltage stability regions and critical sections[J].Automation of Electric Power Systems,2008,32(17):1-5.
[3]SAUER P W,PAI M A.Power system steady-state stability and the load flow Jacobian[J].IEEE Trans on Power Systems,1990,5(4):1374-1383.
[4]姜涛,李国庆,贾宏杰,等.电压稳定在线监控的简化L指标及其分析方法[J].电力系统自动化,2012,36(21):13-18.JIANG Tao,LI Guoqing,JIA Hongjie,et al.Simplified L-index and its sensitivity analysis method for on-line monitoring of voltage stability control[J].Automation of Electric Power Systems,2012,36(21):13-18.
[5]余贻鑫,贾宏杰,严雪飞.可准确跟踪鞍节点分岔的改进局部电压稳定指标LI[J].电网技术,1999,23(5):26-31.YU Yixin,JIA Hongjie,YAN Xuefei.An improved local voltage stability index LI,which can trace saddle-node bifurcation exactly[J].Power System Technology,1999,23(5):26-31.
[6]KESSEL P,GLAVITSCH H.Estimating the voltage stability of a power system[J]·Power Delivery,IEEE Transactions on,1986,1(3):346-354.
[7]贾宏杰,孙晓彦,张沛.基于L指标的电压稳定约束下的最优潮流[J].电力系统及其自动化学报,2006,18(1):34-38.JIA Hongjie,SUN Xiaoyan,ZHANG Pei.Optimal power flow with voltage stability constraint based on L index[J].Proceedings of the CSU-EPSA,2006,18(1):34-38.
[8]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):19-23.GAO Peng,DAN Libao,YAO Liangzhong,et al.A multicriterion integrated voltage stability index for weak buses identification[J].Power System Technology,2009,33(19):19-23.
[9]杨佳俊,徐建政.改进量子遗传算法在无功优化中的应用[J].电工电气,2013,34(9):32-36.YANG Jiajun,XU Jianzheng.Application of improved quantum genetic algorithm in reactive power optimization[J].Electrotechnics Electric,2013,34(9):32-36.
[10]张锁魁.无功补偿对风电系统电压稳定和功率损耗的影响分析[J].电力电容器与无功补偿,2014,35(5):21-24.ZHANG Suokui.Influence analysis of reactive power compensation on voltage stability and power loss of wind power system[J].Power Capacitor&Reactive Power Compensa-tion,2014,35(5):21-24.
[11]牟晓明,李志民.电压薄弱节点的在线识别与控制方法[J].电网技术,2012,36(8):163-168.MOU Xiaoming,LI Zhimin.An analytical method for online identification and control of voltage weak buses[J].Power System Technology,2012,36(8):163-168.
[12]陈磊,闵勇,侯凯元.考虑风电随机性的静态电压稳定概率评估[J].中国电机工程学报,2016,36(3):674-680.CHEN Lei,MIN Yong,HOU Kaiyuan.Probabilistic steadystate voltage stability assessment considering stochastic wind power[J].Proceedings of the CSEE,2016,36(3):674-680.
[13]韩琪,余贻鑫,贾宏杰,等.静态电压稳定域边界的非线性近似解析表达[J].电力系统自动化,2005,29(11):10-14.HAN Qi,YU Yixin,JIA Hongjie,et al.Analytical forms of boundaries of static voltage stability region with nonlinear terms[J].Automation of Electric Power Systems,2005,29(11):10-14.
[14]刘娅.变电站无功补偿分析[J].电力电容器与无功补偿,2009,30(6):19-22.LIU Ya.Analysis on the reactive power compensation of substation[J].Power Capacitor&Reactive Power Compensation,2009,30(6):19-22.
[15]姜涛,陈厚合,李国庆.基于局部电压稳定指标的电压/无功分区调节方法[J].电网技术,2012,36(7):207-213.JIANG Tao,CHEN Houge,LI Guoqing.A new algorithm for partitioned regulation of voltage and reactive power in power system utilizing local voltage stability index[J].Power System Technology,2012,36(7):207-213.
[16]徐琳,卢继平,汪洋,等.电力系统节点电压稳定指标的研究[J].电网技术,2010,34(3):26-30.XU Lin,LU Jiping,WANG Yang,et al.Research on nodal voltage stability index of power system[J].Power System Technology,2010,34(3):26-30.