计及发电机动态的多端口网络等值及中长期电压稳定监视
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摘要
在中长期电压稳定过程中,发电机可能会由于无功短缺导致过励磁限制器(over-excitation limiter,OXL)启动,使得将发电机保持为PV节点的这一传统做法面临一定问题。该文对常规多端口网络等值方法进行了改进,将可描述OXL作用下的发电机模型应用到多端口网络中,给出了发电机OXL启动的在线判定方法,使得改进后的多端口等值网络能够有效计及发电机OXL的动态变化。进一步,基于计及发电机动态的多端口等值网络,推导出可辨识负荷功率最大值点的电压稳定性指标。仿真结果表明,该文方法对即将发生的中长期电压崩溃能起到有效的预警作用。
During the mid-long term voltage stability, the generator may, due to reactive power shortages, start its over-excitation limiter(OXL), leading the conventional approach that keeps the generator as PV node faces some problems. This paper improved the traditional multi-port network equivalent method by applying the generator model which can describe the action of OXL to the multi-port network, and provided an approach for online identification of OXL startup, thus the dynamic conversion of generator OXL can be considered in the improved multi-port equivalent network. Further, a voltage stability index was, based on the proposed multi-port equivalent network, derived to identify the maximum load power point. Simulation results show that the proposed method can provide a good early warning for the impending mid-long term voltage collapse.
During the mid-long term voltage stability, the generator may, due to reactive power shortages, start its over-excitation limiter(OXL), leading the conventional approach that keeps the generator as PV node faces some problems. This paper improved the traditional multi-port network equivalent method by applying the generator model which can describe the action of OXL to the multi-port network, and provided an approach for online identification of OXL startup, thus the dynamic conversion of generator OXL can be considered in the improved multi-port equivalent network. Further, a voltage stability index was, based on the proposed multi-port equivalent network, derived to identify the maximum load power point. Simulation results show that the proposed method can provide a good early warning for the impending mid-long term voltage collapse.
引文
[1]Glavic M,Van Cutsem T.A short survey of methods for voltage instability detection[C]//Proceedings of 2011IEEE Power and Energy Society General Meeting.Detroit,USA,2011:1-8.
[2]马世英.全时域多目标电压安全预警及防控技术研究[D].北京:中国电力科学研究院,2013.Ma Shiying.Research on full-time-domain multi-target voltage security warning and prevention[D].Beijing:China Electronic Power Research Institute,2013(in Chinese).
[3]Glavic M,van Cutsem T.Wide-area detection of voltage instability from synchronized phasor measurements.Part II:Simulation results[J].IEEE Transactions on Power Systems,2009,24(3):1417-1425.
[4]Capitanescu F,van Cutsem T.Unified sensitivity analysis of unstable or low voltages caused by load increases or contingencies[J].IEEE Transactions on Power Systems,2005,20(1),321-329.
[5]Van Cutsem T,Jacquemart Y,Marquet J N,et al.A comprehensive analysis of mid-term voltage stability[J].IEEE Transactions on Power Systems,1995,10(3):1173-1182.
[6]Lambrou C,Mandoulidis P,Vournas C.Local voltage instability monitoring and protection in the presence of self-restoring loads and two-level LTCs[C]//Proceedings of 2011 IEEE Power and Energy Society General Meeting.San Diego,CA:IEEE,2011:1-9.
[7]周双喜,等.电力系统电压稳定性及其控制[M].北京:中国电力出版社,2004.Zhou Shuangxi,et al.Power system voltage stability and control[M].Beijing:China Electric Power Press,2004(in Chinese).
[8]鲍海波,韦化.考虑发电机运行极限的电压稳定临界点互补模型与算法[J].电力系统自动化,2012,36(22):12-18.Bao Haibo,Wei Hua.A complementary model and algorithm for critical points of static voltage stability considering generator capability limits[J].Automation of Electric Power Systems,2012,36(22):12-18(in Chinese).
[9]孙华东,陈树勇,常晓鹏,等.适应大扰动的电力系统戴维南等值参数跟踪算法[J].中国电机工程学报,2012,32(22):126-132.Sun Huadong,Chen Shuyong,Chang Xiaopeng,et al.A tracing algorithm of thevenin equivalent parameters for power systems with large disturbance[J].Proceedings of the CSEE,2012,32(22):126-132(in Chinese).
[10]汤涌,易俊,侯俊贤,等.基于时域仿真的戴维南等值参数跟踪计算方法[J].中国电机工程学报,2010,30(34):63-68.Tang Yong,Yi Jun,Hou Junxian,et al.Calculation method for thevenin equivalent parameters based on time domain simulation[J].Proceedings of the CSEE,2010,30(34):63-68(in Chinese).
[11]李连伟,吴政球,钟浩,等.基于节点戴维南等值的静态电压稳定裕度快速求解[J].中国电机工程学报,2010,30(4):79-83.Li Lianwei,Wu Zhengqiu,Zhong Hao,et al.Fast estimation method for steady-state voltage stability margin based on node thevenin equivalent[J].Proceedings of the CSU-EPSA,2010,30(4):79-83(in Chinese).
[12]李来福,于继来,柳焯.戴维南等值跟踪的参数漂移问题研究[J].中国电机工程学报,2005,25(20):1-5.Li Laifu,Yu Jilai,Liu Zhuo.Research on parameters drift problem in tracking thevenin equivalent[J].Proceedings of the CSEE,2005,25(20):1-5(in Chinese).
[13]Li W X,Chen T W,Xu W S.On impedance matching and maximum power transfer[J].Electric Power Systems Research,2010,80(9):1082-1088.
[14]李卫星,牟晓明,李志民.电力系统戴维南等值参数的解析与思考[J].中国电机工程学报,2012,32(S1):28-34.Li Weixing,Mou Xiaoming,Li Zhimin.Analysis and thoughts on the thevenin equivalent parameters for power systems[J].Proceedings of the CSEE,2012,32(S1):28-34(in Chinese).
[15]Wang Y,Wang C S,Lin F,et al.Incorporating generator equivalent model into voltage stability analysis[J].IEEE Transactions on Power Systems,2013,28(4):4857-4866.
[16]Glavic M,van Cutsem T.Wide-area detection of voltage instability from synchronized phasor measurements.Part I:Principle[J].IEEE Transactions on Power Systems,2009,24(3):1408-1416.
[17]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(in Chinese).
[18]Taylor C W.电力系统电压稳定[M].王伟胜,译.北京:中国电力出版社,2002:184-186.Taylor C W.Power system voltage stability[M].Wang Weisheng,translation.Beijing:China Electric Power Press,2002:184-186(in Chinese).
[2]马世英.全时域多目标电压安全预警及防控技术研究[D].北京:中国电力科学研究院,2013.Ma Shiying.Research on full-time-domain multi-target voltage security warning and prevention[D].Beijing:China Electronic Power Research Institute,2013(in Chinese).
[3]Glavic M,van Cutsem T.Wide-area detection of voltage instability from synchronized phasor measurements.Part II:Simulation results[J].IEEE Transactions on Power Systems,2009,24(3):1417-1425.
[4]Capitanescu F,van Cutsem T.Unified sensitivity analysis of unstable or low voltages caused by load increases or contingencies[J].IEEE Transactions on Power Systems,2005,20(1),321-329.
[5]Van Cutsem T,Jacquemart Y,Marquet J N,et al.A comprehensive analysis of mid-term voltage stability[J].IEEE Transactions on Power Systems,1995,10(3):1173-1182.
[6]Lambrou C,Mandoulidis P,Vournas C.Local voltage instability monitoring and protection in the presence of self-restoring loads and two-level LTCs[C]//Proceedings of 2011 IEEE Power and Energy Society General Meeting.San Diego,CA:IEEE,2011:1-9.
[7]周双喜,等.电力系统电压稳定性及其控制[M].北京:中国电力出版社,2004.Zhou Shuangxi,et al.Power system voltage stability and control[M].Beijing:China Electric Power Press,2004(in Chinese).
[8]鲍海波,韦化.考虑发电机运行极限的电压稳定临界点互补模型与算法[J].电力系统自动化,2012,36(22):12-18.Bao Haibo,Wei Hua.A complementary model and algorithm for critical points of static voltage stability considering generator capability limits[J].Automation of Electric Power Systems,2012,36(22):12-18(in Chinese).
[9]孙华东,陈树勇,常晓鹏,等.适应大扰动的电力系统戴维南等值参数跟踪算法[J].中国电机工程学报,2012,32(22):126-132.Sun Huadong,Chen Shuyong,Chang Xiaopeng,et al.A tracing algorithm of thevenin equivalent parameters for power systems with large disturbance[J].Proceedings of the CSEE,2012,32(22):126-132(in Chinese).
[10]汤涌,易俊,侯俊贤,等.基于时域仿真的戴维南等值参数跟踪计算方法[J].中国电机工程学报,2010,30(34):63-68.Tang Yong,Yi Jun,Hou Junxian,et al.Calculation method for thevenin equivalent parameters based on time domain simulation[J].Proceedings of the CSEE,2010,30(34):63-68(in Chinese).
[11]李连伟,吴政球,钟浩,等.基于节点戴维南等值的静态电压稳定裕度快速求解[J].中国电机工程学报,2010,30(4):79-83.Li Lianwei,Wu Zhengqiu,Zhong Hao,et al.Fast estimation method for steady-state voltage stability margin based on node thevenin equivalent[J].Proceedings of the CSU-EPSA,2010,30(4):79-83(in Chinese).
[12]李来福,于继来,柳焯.戴维南等值跟踪的参数漂移问题研究[J].中国电机工程学报,2005,25(20):1-5.Li Laifu,Yu Jilai,Liu Zhuo.Research on parameters drift problem in tracking thevenin equivalent[J].Proceedings of the CSEE,2005,25(20):1-5(in Chinese).
[13]Li W X,Chen T W,Xu W S.On impedance matching and maximum power transfer[J].Electric Power Systems Research,2010,80(9):1082-1088.
[14]李卫星,牟晓明,李志民.电力系统戴维南等值参数的解析与思考[J].中国电机工程学报,2012,32(S1):28-34.Li Weixing,Mou Xiaoming,Li Zhimin.Analysis and thoughts on the thevenin equivalent parameters for power systems[J].Proceedings of the CSEE,2012,32(S1):28-34(in Chinese).
[15]Wang Y,Wang C S,Lin F,et al.Incorporating generator equivalent model into voltage stability analysis[J].IEEE Transactions on Power Systems,2013,28(4):4857-4866.
[16]Glavic M,van Cutsem T.Wide-area detection of voltage instability from synchronized phasor measurements.Part I:Principle[J].IEEE Transactions on Power Systems,2009,24(3):1408-1416.
[17]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(in Chinese).
[18]Taylor C W.电力系统电压稳定[M].王伟胜,译.北京:中国电力出版社,2002:184-186.Taylor C W.Power system voltage stability[M].Wang Weisheng,translation.Beijing:China Electric Power Press,2002:184-186(in Chinese).