基于Park变换的线路阻抗参数在线辨识新方法
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摘要
针对高压微电网或等效线路阻抗呈感性的低压微电网,提出孤岛运行模式下的一种线路阻抗参数在线辨识方法。通过Park变换将电压、电流变换到两相同步旋转坐标系下,利用电压、电流的直流分量求解线路阻抗,从而识别出线路电阻值和电感值。该方法不仅适用于三相平衡系统,更可在三相负荷不平衡情况下,实现对输电线路阻抗参数的在线辨识。仿真和实验中,将提出的Park变换法与Karrenbauer相模变换法进行对比,结果表明所提出的Park变换法易于编程且辨识精度较高。
Aiming at high voltage microgrid,or low voltage microgrid with equivalent inductive line impedance,theonline identification method of line impedance parameter in islanding operation mode was proposed. The voltage andcurrent were transformed into two-phase synchronous rotating coordinate system through the Park transformation,DCcomponents of voltage and current were used to get line impedance for identifying the line resistance value andinductance value. The proposed method not only is suitable to three-phase balance system,but also can realize onlineidentification of transmission line impedance parameters under three-phase unbalanced load condition.In simulationand experiment,the Park transformation method was compared with Karrenbauer phase-mode transformation method,the results show that the proposed Park transformation method is easier to program and has higher identification accuracy.
Aiming at high voltage microgrid,or low voltage microgrid with equivalent inductive line impedance,theonline identification method of line impedance parameter in islanding operation mode was proposed. The voltage andcurrent were transformed into two-phase synchronous rotating coordinate system through the Park transformation,DCcomponents of voltage and current were used to get line impedance for identifying the line resistance value andinductance value. The proposed method not only is suitable to three-phase balance system,but also can realize onlineidentification of transmission line impedance parameters under three-phase unbalanced load condition.In simulationand experiment,the Park transformation method was compared with Karrenbauer phase-mode transformation method,the results show that the proposed Park transformation method is easier to program and has higher identification accuracy.
引文
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[2]王成山,肖朝霞,王守相.微网中分布式电源逆变器的多环反馈控制策略[J].电工技术学报,2009,24(2):100—107.[2]Wang Chengshan,Xiao Zhaoxia,Wang Shouxiang.Multiple feedback loop control scheme for inverters of the micro source in microgrids[J].Transactions of China Electrotechnical Society,2009,24(2):100—107.
[3]黄伟煌,王芸,赵浩然.一种新型的永磁直驱风力发电机组控制策略在微网中的应用[J].太阳能学报,2015,36(1):61—69.[3]Huang Weihuang,Wang Yun,Zhao Haoran.A novel control strategy of PMSG based wind turbines for microgrid application[J].Acta Energiac Solaris Sinica,2015,36(1):61—69.
[4]Lee Chia-Tse,Chu Chia-Chi,Cheng P0-Tai.A new droop control method for the autonomous operation of distributed energy resource interface converters[J].IEEE Transactions on Power Electronics,2013,28(4):1980—1993.
[5]Shoeiby B,Davoodnezhad R,Holmes D G,et al.Voltage-frequency control of an islanded microgrid using the intrinsic droop characteristics of resonant current regulators[A].Energy Conversion Congress and Exposition[C],Pittsburgh,USA,2014.
[6]郑永伟,陈民铀,李闯,等.自适应调节下垂系数的微电网控制策略[J].电力系统自动化,2013,37(7):6—11.[6]Zheng Yongwei,Chen Minyou,Li Chuang,et al.A microgrid control strategy based on adaptive droopingcoefficient adjustment[J].Automation of Electric PowerSystems,2013,37(7):6—11.
[7]韩华,刘尧,孙尧,等.一种微电网无功均分的改进下垂控制策略[J].中国电机工程学报,2014,34(16):2639—2648.[7]Han Hua,Liu Yao,Sun Yao,et al.An improvedcontrol strategy for reactive power sharing in microgrids[J].Proceedings of the CSEE,2014,34(16):2639—2648.
[8]阚志忠,张纯江,薛海芬,等.微网中三相逆变器无互连线并联新型下垂控制策略[J].中国电机工程学报,2011,31(33):68—74.[8]Kan Zhizhong,Zhang Chunjiang,Xue Haifen,et al.Anovel droop control of the three-phase inverters inwireless parallel operation in microgrid[J].Proceedingsof the CSEE,2011,31(33):68—74.
[9]Debrabandere K,Bolsens B,Vandenkeybus J,et al.Avoltage and frequency droop control method for parallelinverters[J].IEEE Transactions on Power Electronics,2007,22(4):1107—1115.
[10]孙孝峰,陈敬娴,骆志伟,等.基于并网逆变器的一种基波阻抗识别方法[J].太阳能学报,2014,35(7):1237—1243.[10]Sun Xiaofeng,Chen Jingxian,Luo Zhiwei,et al.Afundamental impedance indentification method based ongrid-conneted inverter[J].Acta Energiac Solaris Sinica,2014,35(7):1237—1243.
[11]Bao Le,Cong Wei.Transmission line parameterscoupling algorithm based on synchronous samplingsignals[A].2rd International Conference on Electricaland Electronics Engineering[C],Beijing,China,2014.
[12]陈达威,朱桂萍.低压微电网中的功率传输特性[J].电工技术学报,2010,25(7):117—122.[12]Chen Dawei,Zhu Guiping.Power Transmissioncharacteristics of low voltage microgrids[J].Transactions of China Electrotechnical Society,2010,25(7):117—122.
[13]宋国兵,李森,康小宁,等.一种新相模变换矩阵[J].电力系统自动化,2007,31(14):57—60.[13]Song Guobing,Li Sen,Kang Xiaoning,et al.A novelphase-mode transformation matrix[J].Automation ofElectric Power Systems,2007,31(14):57—60.
[14]夏道止.电力系统分析[M].北京:中国电力出版社,2010.[14]Xia Daozhi.Electric power system analysis[M].Beijing:China electric power press,2010.