大电网静态稳定主导模式在线判别方法研究
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摘要
随着可再生能源的大规模并网,电网源侧状态随机性增强,可能导致源侧静态功角失稳或负荷侧静态电压失稳,在线识别出电网静态失稳的主导模式对安全防控具有重要的指导意义。为此,首先基于两节点系统推导源侧和负荷侧的功率极限,以此建立统一量纲的源侧功角稳定裕度和负荷侧电压稳定裕度指标。然后,将原有面向负荷节点戴维南等值方法扩展至电源节点,完善了戴维南等值参数辨识方法的适用范围,为量化对比分析静态稳定的功角因素和电压因素提供了新的思路。最后,比较系统运行中2个裕度指标的变化态势,确定稳定的主导模式,并用仿真算例验证了所提稳定主导模式识别方法的有效性。
With large-scale integration of renewable energy, source side randomness of power grids may cause steady-state angle instability or voltage instability on load side. On-line identification of dominant static instability mode of power grids has important guiding significance for security control. For this reason, firstly, active power limits of source side and load side are deduced based on the two-node system, so as to establish angle and voltage stability margin indexes with uniform dimension on source side and load side. Secondly, based on Thevenin equivalence of load nodes, a method of Thevenin equivalent parameter identification for source node is proposed, providing a new idea for quantitative analysis of angle and voltage factors in static stability. Finally, change trend of the two margin indexes during system operation variation is compared, and the dominant stability mode is determined. Validity of the proposed method is verified by simulation results.
With large-scale integration of renewable energy, source side randomness of power grids may cause steady-state angle instability or voltage instability on load side. On-line identification of dominant static instability mode of power grids has important guiding significance for security control. For this reason, firstly, active power limits of source side and load side are deduced based on the two-node system, so as to establish angle and voltage stability margin indexes with uniform dimension on source side and load side. Secondly, based on Thevenin equivalence of load nodes, a method of Thevenin equivalent parameter identification for source node is proposed, providing a new idea for quantitative analysis of angle and voltage factors in static stability. Finally, change trend of the two margin indexes during system operation variation is compared, and the dominant stability mode is determined. Validity of the proposed method is verified by simulation results.
引文
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[17]Machowski J,Kacejko P,Robak S,et al.Simplified angle and voltage stability criteria for power system planning based on the short-circuit power[J].International Transactions on Electrical Energy Systems,2015,25(11):3096-3108.
[18]李明节.大规模特高压交直流混联电网特性分析与运行控制[J].电网技术,2016,40(4):985-991.Li Mingjie.Characteristic analysis and operational control of large-scale hybrid UHV AC/DC Power Grids[J].Power System Technology,2016,40(4):985-991(in Chinese).
[19]章锐,陈树勇,刘道伟,等.戴维南等值参数辨识方法综述[J].电网技术,2017,41(1):146-156.Zhang Rui,Chen Shuyong,Liu Daowei,et al.Review of the Thevenin equivalent parameters identification methods[J].Power System Technology,2017,41(1):146-156(in Chinese).
[20]贠志皓,丰颖,咸国富,等.计及发电机无功越限的广域戴维南等值参数在线计算方法[J].电力系统自动化,2016,40(11):53-60.Yun Zhihao,Feng Ying,Xian Guofu,et al.A new online computation method of wide area Thevenin equivalent parameters considering generators reactive power constraints[J].Automation of Electric Power Systems,2016,40(11):53-60(in Chinese).
[2]迟永宁,刘燕华,王伟胜,等.风电接入对电力系统的影响[J].电网技术,2007,31(3):77-81.Chi Yongning,Liu Yanhua,Wang Weisheng,et al.Study on impact of wind power integration on power system[J].Power System Technology,2007,31(3):77-81(in Chinese).
[3]韩文,韩祯祥.电压崩溃与功角不稳的关系[J].电力系统自动化,1996,20(12):18-21.Han Wen,Han Zhenxiang.Relationship between voltage collapse and angle instability[J].Automation of Electric Power Systems,1996,20(12):18-21(in Chinese).
[4]韩文,韩祯祥.一种判别电力系统电压稳定和功角稳定的新方法[J].中国电机工程学报,1997,17(6):8-9.Han Wen,Han Zhenxiang.A new method identifying voltage stability and angle stability[J].Proceedings of the CSEE,1997,17(6):8-9(in Chinese).
[5]武志刚,张尧,郑风雷,等.电力系统特征值与状态变量对应关系分析[J].电力系统自动化,2001,25(10):23-26.Wu Zhigang,Zhang Yao,Zheng Fenglei,et al.Analysis of relationship between eigenvalues and state variables in power systems[J].Automation of Electric Power Systems,2001,25(10):23-26(in Chinese).
[6]吴浩,韩祯祥.电压稳定和功角稳定关系的平衡点分析[J].电力系统自动化,2003,27(12):28-31.Wu Hao,Han Zhenxiang.Analysis of relationship between voltage stability and angle stability through equilibriums[J].Automation of Electric Power Systems,2003,27(12):28-31(in Chinese).
[7]张靖,文劲宇,程时杰.基于向量场正规形方法的功角和电压稳定特征分析[J].电力系统自动化,2006,30(12):12-16.Zhang Jing,Wen Jinyu,Cheng Shijie.Normal forms of vector fields based analysis of power system angle and voltage stability characteristic[J].Automation of Electric Power Systems,2006,30(12):12-16(in Chinese).
[8]张靖,文劲宇,程时杰,等.基于向量场正规形的电力系统稳定模式相关性理论分析[J].中国电机工程学报,2006,26(11):82-86.Zhang Jing,Wen Jinyu,Cheng Shijie,et al.Theoretical analysis of the interaction between power system stability modes with the normal forms of vector fields[J].Proceedings of the CSEE,2006,26(11):82-86(in Chinese).
[9]方勇,杨洪耕,徐方维.基于最简正规形的电力系统鞍结分岔分析[J].电网技术,2012,36(8):182-186.Fang Yong,Yang Honggeng,Xu Fangwei.Simplest normal form based power system saddle-node bifurcation analysis[J].Power System Technology,2012,36(8):182-186(in Chinese).
[10]方勇,杨洪耕,肖先勇.电力系统二阶共振点稳定模式的最简正规形分析[J].电力系统自动化,2013,37(4):41-46.Fan Yong,Yang Honggeng,Xiao Xianyong.Simplest normal form analysis of power system stable modes at second-order resonance point[J].Automation of Electric Power Systems,2013,37(4):41-46(in Chinese).
[11]王正风,胡晓飞.静态功角稳定和静态电压稳定判据比较分析[J].电力自动化设备,2008(2):61-64.Wang Zhengfeng,Hu Xiaofei.Analysis of static angularity and voltage stability criteria[J].Electric Power Automation Equipment,2008(2):61-64(in Chinese).
[12]汤涌,林伟芳,孙华东,等.基于戴维南等值跟踪的电压失稳和功角失稳的判别方法[J].中国电机工程学报,2009,29(25):1-6.Tang Yong,Lin Weifang,Sun Huadong,et al.Method identifying voltage instability and angle instability based on tracking Thevenin equivalent parameters[J].Proceedings of the CSEE,2009,29(25):1-6(in Chinese).
[13]刘道伟,韩学山,王勇,等.在线电力系统静态稳定域的研究及其应用[J].中国电机工程学报,2009,29(34):42-49.Liu Daowei,Han Xueshan,Wang Yong,et al.Studies on the on-line static stability region in power systems and its application[J].Proceedings of the CSEE,2009,29(34):42-49(in Chinese).
[14]刘道伟,韩学山,杨明,等.基于全参量灵敏度的电网静态稳定实用判据[J].中国电机工程学报,2012,32(7):91-100.Liu Daowei,Han Xueshan,Yang Ming,et al.Applied criterion of power system static stability based on comprehensive parameters sensitivity technique[J].Proceedings of the CSEE,2012,32(7):91-100(in Chinese).
[15]刘光晔,杨以涵.电力系统电压稳定与功角稳定的统一分析原理[J].中国电机工程学报,2013,33(13):135-149.Liu Guangye,Yang Yihan.Theoretical foundation of power system voltage and angle stability unified analysis[J].Proceedings of the CSEE,2013,33(13):135-149(in Chinese).
[16]刘光晔,施海亮,杨以涵.非解析复变电力系统电压稳定的动态分析方法[J].中国电机工程学报,2013,33(10):50-56.Liu Guangye,Shi Hailiang,Yang Yihan.Comprehensive dynamic analysis method for power system static voltage stability[J].Proceedings of the CSEE,2013,33(10):50-56(in Chinese).
[17]Machowski J,Kacejko P,Robak S,et al.Simplified angle and voltage stability criteria for power system planning based on the short-circuit power[J].International Transactions on Electrical Energy Systems,2015,25(11):3096-3108.
[18]李明节.大规模特高压交直流混联电网特性分析与运行控制[J].电网技术,2016,40(4):985-991.Li Mingjie.Characteristic analysis and operational control of large-scale hybrid UHV AC/DC Power Grids[J].Power System Technology,2016,40(4):985-991(in Chinese).
[19]章锐,陈树勇,刘道伟,等.戴维南等值参数辨识方法综述[J].电网技术,2017,41(1):146-156.Zhang Rui,Chen Shuyong,Liu Daowei,et al.Review of the Thevenin equivalent parameters identification methods[J].Power System Technology,2017,41(1):146-156(in Chinese).
[20]贠志皓,丰颖,咸国富,等.计及发电机无功越限的广域戴维南等值参数在线计算方法[J].电力系统自动化,2016,40(11):53-60.Yun Zhihao,Feng Ying,Xian Guofu,et al.A new online computation method of wide area Thevenin equivalent parameters considering generators reactive power constraints[J].Automation of Electric Power Systems,2016,40(11):53-60(in Chinese).