双馈风机转子侧变换器参数对次同步振荡的交互影响机理及其应用研究
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摘要
当双馈风机转子侧变换器(rotor-side converter,RSC)参数设置不当时,与串补线路相连的双馈风电场可能会发生次同步振荡(subsynchronous oscillation,SSO),但目前对于变换器参数对SSO的交互影响规律及其作用机理研究还不够深入。分析了RSC内外环比例系数对SSO交互影响规律,研究表明,外环比例系数对SSO的影响程度与内环比例系数强相关,而内环比例系数对SSO的影响相对独立。针对这一现象,推导了RSC在系统中的等效电阻与其内外环比例系数的关系,从机理上解释了RSC内外环比例系数对SSO的交互影响规律,并利用特征结构分析法验证了机理解释的正确性。最后,直接利用所推导的计及内外环放大倍数的等效电阻值来配置虚拟电阻控制器参数。结果表明,相较于仅考虑内环参数配置的虚拟电阻控制器,所配置的虚拟电阻控制器效果更优,具有较强阻尼且不影响系统稳定性。
Due to improper setting of the parameters of rotor-side converter(RSC), subsynchronous oscillation(SSO) may occur in doubly-fed induction generator(DFIG)-based wind farms connected to series compensated networks. However, researches on the mechanism of interactive effect of RSC parameters on SSO are not adequate enough. This paper analyzes the interactive effect of the scale factors of RSC inner and outer loops on SSO. The research shows that the influence of outer-loop scale factor on SSO has a strong correlation with RSC inner-loop scale factor, while the impact of inner-loop scale factor on SSO is relatively independent. To explain this phenomenon, the relationship between RSC equivalent resistance and the scale factors of its inner and outer loops is deduced. The interactive effect of the scale factors of RSC inner and outer loops on SSO is also explained based on inherent mechanism, and then its validity is verified with eigenvalue analysis. Finally, the deduced equivalent resistance incorporating scale factors of the inner and outer loops is directly applied to configure parameters of a virtual resistance controller. Results show that, compared with traditional virtual resistance controller only considering inner-loop parameters, the one configured with the proposed parameter-setting approach is more effective and has stronger damping without affecting system stability.
Due to improper setting of the parameters of rotor-side converter(RSC), subsynchronous oscillation(SSO) may occur in doubly-fed induction generator(DFIG)-based wind farms connected to series compensated networks. However, researches on the mechanism of interactive effect of RSC parameters on SSO are not adequate enough. This paper analyzes the interactive effect of the scale factors of RSC inner and outer loops on SSO. The research shows that the influence of outer-loop scale factor on SSO has a strong correlation with RSC inner-loop scale factor, while the impact of inner-loop scale factor on SSO is relatively independent. To explain this phenomenon, the relationship between RSC equivalent resistance and the scale factors of its inner and outer loops is deduced. The interactive effect of the scale factors of RSC inner and outer loops on SSO is also explained based on inherent mechanism, and then its validity is verified with eigenvalue analysis. Finally, the deduced equivalent resistance incorporating scale factors of the inner and outer loops is directly applied to configure parameters of a virtual resistance controller. Results show that, compared with traditional virtual resistance controller only considering inner-loop parameters, the one configured with the proposed parameter-setting approach is more effective and has stronger damping without affecting system stability.
引文
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[14]高本锋,李忍,杨大业,等.双馈风电机组次同步振荡阻尼特性与抑制策略[J].电力自动化设备,2015,35(12):11-20.Gao Benfeng,Li Ren,Yang Daye,et al.Damping characteristics and countermeasure of DFIG subsynchronous oscillation[J].Electric Power Automation Equipment,2015,35(12):11-20(in Chinese).
[15]Huang P H,Moursi M S E,Xiao W,et al.Subsynchronous resonance mitigation for series-compensated DFIG-based wind farm by using two-degree-of-freedom control strategy[J].IEEE Transactions on Power Systems,2015,30(3):1442-1454.
[16]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,et al.Analysis and mitigation of SSR problems in large-scale wind farms with double-fed wind turbines[J].Automation of Electric Power Systems,2014,38(22):26-31(in Chinese).
[17]Li H,Yang C,Zhao B,et al.Aggregated models and transient performances of a mixed wind farm with different wind turbine generator systems[J].Electric Power Systems Research,2012(92):1-10.
[18]Fan L,Zhu C,Miao Z L,et al.Modal analysis of a DFIG-based wind farm interfaced with a series compensated network[J].IEEETransactions on Energy Conversion,2011,26(4):1010-1020.
[19]Xie X,Zhang X,Liu H,et al.Characteristic analysis of subsynchronous resonance in practical wind farms connected to series-compensated transmissions[J].IEEE Transactions on Energy Conversion,2017,32(3):1117-1126.
[20]张剑,肖湘宁,高本锋,等.双馈风力发电机的次同步控制相互作用机理与特性研究[J].电工技术学报,2013,28(12):142-149.Zhang Jian,Xiao Xiangning,Gao Benfeng,et al.Mechanism and characteristic study on subsynchronous control interaction of a DFIG-based wind-power generator[J].Transactions of China Electrotechnical Society,2013,28(12):142-149(in Chinese).
[21]Leon A E,Solsona J A.Subsynchronous interaction damping control for DFIG wind turbines[J].IEEE Transactions on Power Systems,2014,30(1):419-428.
[22]董晓亮,李江,侯金鸣.基于双馈风机转子侧变流器的次同步谐振抑制方法[J].电力系统自动化,2016,40(8):92-97.Dong Xiaoliang,Li Jiang,Hou Jinming.Subsynchronous resonance suppression method based on rotor-side converters in DFIG-based wind turbines[J].Automation of Electric Power Systems,2016,40(8):92-97(in Chinese).
[23]王波,卢继平,龚建原,等.含双馈机组转子侧附加控制的风电场次同步振荡抑制方法[J].电网技术,2013,37(9):2580-2584.Wang Bo,Lu Jiping,Gong Jianyuan,et al.A method to suppress subsynchronous oscillation of wind farm composed of doubly fed induction generators with additional rotor side control[J].Power System Technology,2013,37(9):2580-2584(in Chinese).
[2]谢小荣,王路平,贺静波,等.电力系统次同步谐振/振荡的形态分析[J].电网技术,2017,41(4):1043-1049.Xie Xiaorong,Wang Luping,He Jingbo,et al.Analysis of subsynchronous resonance/oscillation types in power systems[J].Power System Technology,2017,41(4):1043-1049(in Chinese).
[3]黄耀,王西田,陈昆明.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.SSI mechanism simulation validation and practical mitigation strategy of DFIG-based wind farms[J].Power System Technology,2016,40(8):2364-2369(in Chinese).
[4]胡应宏,邓春,谢小荣,等.双馈风机-串补输电系统次同步谐振的附加阻尼控制[J].电网技术,2016,40(4):1169-1173.Hu Yinghong,Deng Chun,Xie Xiaorong,et al.Additional damping control of DFIG series compensated transmission system under subsynchronous resonance[J].Power System Technology,2016,40(4):1169-1173(in Chinese).
[5]Wang L,Xie X,Jiang Q,et al.Investigation of SSR in practical DFIG-based wind farms connected to a series-compensated power system[J].IEEE Transactions on Power Systems,2015,30(5):2772-2779.
[6]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,et al.Study of complex oscillation caused by renewable energy integration and its solution[J].Power System Technology,2017,41(4):1035-1042(in Chinese).
[7]Fan L,Kavasseri R,Miao Z L,et al.Modeling of DFIG-based wind farms for SSR analysis[J].IEEE Transactions on Power Delivery,2010,25(4):2073-2082.
[8]Irwin G D,Jindal A K,Isaacs A L.Sub-synchronous control interactions between type 3 wind turbines and series compensated ACtransmission systems[C]//Power and Energy Society General Meeting.San Diego,USA:IEEE,2011:1-6.
[9]Ostadi A,Yazdani A,Varma R K.Modeling and stability analysis of a DFIG-based wind-power generator interfaced with a seriescompensated line[J].IEEE Transactions on Power Delivery,2009,24(3):1504-1514.
[10]董晓亮,谢小荣,杨煜,等.双馈风机串补输电系统次同步谐振影响因素及稳定区域分析[J].电网技术,2015,39(1):189-193.Dong Xiaoliang,Xie Xiaorong,Yang Yu,et al.Impacting factors and stable area analysis of subsynchronous resonance in DFIG based wind farms connected to series-compensated power system[J].Power System Technology,2015,39(1):189-193(in Chinese).
[11]Nath R,Grande-Moran C.Study of sub-synchronous control interaction due to the interconnection of wind farms to a series compensated transmission system[C]//Transmission and Distribution Conference and Exposition.Orlando,USA:IEEE,2012:1-6.
[12]孔永乐.大规模风电外送次同步振荡机理研究[D].北京:华北电力大学,2013.
[13]赵斌.双馈风电场并网系统的次同步振荡特性及抑制策略研究[D].重庆:重庆大学,2015.
[14]高本锋,李忍,杨大业,等.双馈风电机组次同步振荡阻尼特性与抑制策略[J].电力自动化设备,2015,35(12):11-20.Gao Benfeng,Li Ren,Yang Daye,et al.Damping characteristics and countermeasure of DFIG subsynchronous oscillation[J].Electric Power Automation Equipment,2015,35(12):11-20(in Chinese).
[15]Huang P H,Moursi M S E,Xiao W,et al.Subsynchronous resonance mitigation for series-compensated DFIG-based wind farm by using two-degree-of-freedom control strategy[J].IEEE Transactions on Power Systems,2015,30(3):1442-1454.
[16]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,et al.Analysis and mitigation of SSR problems in large-scale wind farms with double-fed wind turbines[J].Automation of Electric Power Systems,2014,38(22):26-31(in Chinese).
[17]Li H,Yang C,Zhao B,et al.Aggregated models and transient performances of a mixed wind farm with different wind turbine generator systems[J].Electric Power Systems Research,2012(92):1-10.
[18]Fan L,Zhu C,Miao Z L,et al.Modal analysis of a DFIG-based wind farm interfaced with a series compensated network[J].IEEETransactions on Energy Conversion,2011,26(4):1010-1020.
[19]Xie X,Zhang X,Liu H,et al.Characteristic analysis of subsynchronous resonance in practical wind farms connected to series-compensated transmissions[J].IEEE Transactions on Energy Conversion,2017,32(3):1117-1126.
[20]张剑,肖湘宁,高本锋,等.双馈风力发电机的次同步控制相互作用机理与特性研究[J].电工技术学报,2013,28(12):142-149.Zhang Jian,Xiao Xiangning,Gao Benfeng,et al.Mechanism and characteristic study on subsynchronous control interaction of a DFIG-based wind-power generator[J].Transactions of China Electrotechnical Society,2013,28(12):142-149(in Chinese).
[21]Leon A E,Solsona J A.Subsynchronous interaction damping control for DFIG wind turbines[J].IEEE Transactions on Power Systems,2014,30(1):419-428.
[22]董晓亮,李江,侯金鸣.基于双馈风机转子侧变流器的次同步谐振抑制方法[J].电力系统自动化,2016,40(8):92-97.Dong Xiaoliang,Li Jiang,Hou Jinming.Subsynchronous resonance suppression method based on rotor-side converters in DFIG-based wind turbines[J].Automation of Electric Power Systems,2016,40(8):92-97(in Chinese).
[23]王波,卢继平,龚建原,等.含双馈机组转子侧附加控制的风电场次同步振荡抑制方法[J].电网技术,2013,37(9):2580-2584.Wang Bo,Lu Jiping,Gong Jianyuan,et al.A method to suppress subsynchronous oscillation of wind farm composed of doubly fed induction generators with additional rotor side control[J].Power System Technology,2013,37(9):2580-2584(in Chinese).