基于阻抗模型的风电系统次同步振荡稳定性量化分析方法
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摘要
国内外已经发生过多起次同步振荡引发的严重事故。为了深入研究次同步振荡问题,首先通过对阻抗矩阵与特征方程的分析,以等效电路的方式,从源网阻抗的角度解释了特征阻抗和特征方程的物理意义。在此基础上,根据特征阻抗曲线估算了系统振荡模态特征值,提出了基于阻抗模型的稳定性量化分析方法,改进了目前阻抗分析法稳定性分析的不足。最后通过仿真算例验证了该系统阻抗稳定性分析方法的实用性和有效性。
Several serious accidents caused by subsynchronous oscillation(SSO) have occurred. In order to study the subsynchronous oscillation, the impedance matrix and the characteristic equation are analyzed. By means of equivalent circuit, the physical meanings of the characteristic equation and impedance are analyzed from the view of impedance. Then, the eigenvalues of the oscillation mode of the system are estimated according to the frequency impedance curve. A quantitative analysis method based on the impedance method is proposed, and the deficiency of existing stability analysis methods based on impedance model is resolved. Finally, the practicability and effectiveness of the impedance stability analysis method are verified through simulation case.
Several serious accidents caused by subsynchronous oscillation(SSO) have occurred. In order to study the subsynchronous oscillation, the impedance matrix and the characteristic equation are analyzed. By means of equivalent circuit, the physical meanings of the characteristic equation and impedance are analyzed from the view of impedance. Then, the eigenvalues of the oscillation mode of the system are estimated according to the frequency impedance curve. A quantitative analysis method based on the impedance method is proposed, and the deficiency of existing stability analysis methods based on impedance model is resolved. Finally, the practicability and effectiveness of the impedance stability analysis method are verified through simulation case.
引文
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[15] LIU H K,XIE X R,ZHANG C Y,et al.Quantitative SSR analysis of series-compensated DFIG-based wind farms using aggregated RLC circuit model [J].IEEE Transactions on Power Systems,2017,32(1):474-483.
[16] PLATZKER A,STRUBLE W.Rigorous determination of the stability of linear n-node circuits from network determinants and the appropriate role of the stability factor K of their reduced two-ports [C]//Third International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits,October 5-7,1994,Duisburg,Germany.New York:IEEE,1994:93-107.
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[2] 王亮,谢小荣,姜齐荣,等.大规模双馈风电场次同步谐振的分析与抑制[J].电力系统自动化,2014,38(22):26-31.WANG Liang,XIE Xiaorong,JIANG Qirong,el al.Analysis and mitigation of SSR problems in large-scale wind farms with doubly-fed wind turbine [J].Automation of Electric Power Systems,2014,38(22):26-31.
[3] 黄耀,王西田,陈昆明,等.双馈风电场次同步相互作用的机理仿真验证与实用抑制策略[J].电网技术,2016,40(8):2364-2369.HUANG Yao,WANG Xitian,CHEN Kunming,el al.SSI mechanism simulation validation and practical mitigation strategy of DFIG-based wind farms [J].Power System Technology,2016,40(8):2364-2369.
[4] 李明节,于钊,许涛,等.新能源并网系统引发的复杂振荡问题及其对策研究[J].电网技术,2017,41(4):1035-1042.LI Mingjie,YU Zhao,XU Tao,el al.Study of complex oscillation caused by renewable energy integration and its solution [J].Power System Technology,2017,41(4):1035-1042.
[5] 陈国平,李明节,许涛,等.关于新能源发展的技术瓶颈研究[J].中国电机工程学报,2017,37(1):20-27.CHEN Guoping,LI Mingjie,XU Tao,el al.Study on technical bottleneck of new energy development [J].Proceedings of the CSEE,2017,37(1):20-27.
[6] 朱鑫要,孙海顺,陈萌,等.一种构建网络状态空间模型的新方法及其在SSR研究中的应用[J].中国电机工程学报,2014,34(4):605-612.ZHU Xinyao,SUN Haishun,CHEN Meng,et al.A novel approach to construct the state-space model of power system grid and its application in SSR study [J].Proceedings of the CSEE,2014,34(4):605-612.
[7] SUN Jian.Impedance-based stability criterion for grid-connected inverters [J].IEEE Transactions on Power Electronics,2011,26(11):3075-3078.
[8] WEN Bo,BOROYEVICH D,BURGOS R,et al.Analysis of D-Q small-signal impedance of grid-tied inverters [J].IEEE Transactions on Power Electronics,2016,31(1):675-687.
[9] SAHNI M,MUTHUMUNI D,BADRZADEH B,et al.Advanced screening small-signal methods for AC distributed power systems-a review [J].IEEE Transactions on Power Electronics,2009,24(11):2545-2554.
[10] 辛焕海,李子恒,董炜,等.三相变流器并网系统的广义阻抗及稳定判据[J].中国电机工程学报,2017,37(5):1277-1293.XIN Huanhai,LI Ziheng,DONG Wei,et al.Generalized-impedance and stability criterion for grid-connected converters [J].Proceedings of the CSEE,2017,37(5):1277-1293.
[11] 张冲,王伟胜,何国庆,等.基于序阻抗的直驱风电场次同步振荡分析与锁相环参数优化设计[J].中国电机工程学报,2017,37(23):6757-6767.ZHANG Chong,WANG Weisheng,HE Guoqing,et al.Analysis of sub-synchronous oscillation of full-converter wind farm based on sequence impedance and an optimized design method for PLL parameters [J].Proceedings of the CSEE,2017,37(23):6757-6767.
[12] MIAO Zhixin.Impedance-model-based SSR analysis for type 3 wind generator and series-compensated network [J].IEEE Transactions on Energy Conversion,2012,27(4):984-991.
[13] 刘方诚,刘进军,张昊东,等.基于G-范数和sum-范数的三相交流级联系统稳定性判据[J].中国电机工程学报,2014,34(24):4092-4100.LIU Fangcheng,LIU Jinjun,ZHANG Haodong,et al.G-norm and sum-norm based stability criterion for three-phase AC cascade systems [J].Proceedings of the CSEE,2014,34(24):4092-4100.
[14] 刘华坤,谢小荣,何国庆,等.新能源发电并网系统的同步参考坐标系阻抗模型及其稳定性判别方法[J].中国电机工程学报,2017,37(14):4002-4007.LIU Huakun,XIE Xiaorong,HE Guoqing,et al.Synchronous reference frame based impedance model and stability criterion for grid-connected renewable energy generation systems[J].Proceedings of the CSEE,2017,37(14):4002-4007.
[15] LIU H K,XIE X R,ZHANG C Y,et al.Quantitative SSR analysis of series-compensated DFIG-based wind farms using aggregated RLC circuit model [J].IEEE Transactions on Power Systems,2017,32(1):474-483.
[16] PLATZKER A,STRUBLE W.Rigorous determination of the stability of linear n-node circuits from network determinants and the appropriate role of the stability factor K of their reduced two-ports [C]//Third International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits,October 5-7,1994,Duisburg,Germany.New York:IEEE,1994:93-107.
[17] RYGG A,MOLINAS M,ZHANG C,et al.A modified sequence-domain impedance definition and its equivalence to the dq-domain impedance definition for the stability analysis of AC power electronic systems [J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(4):1383-1396.
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