并网逆变器频率耦合特性建模及系统稳定性分析
|
摘要
基于阻抗的稳定性分析方法被广泛用于分析并网逆变器与电网互联系统的稳定性。阻抗建模时,通常认为三相互联系统可以分解为相互解耦的正序子系统和负序子系统,并且每个子系统在频域上都具有单入单出的特性。但是,当系统存在频率耦合时,正负序阻抗不再解耦,原有的稳定性分析方法也不再适用。针对并网逆变器,推导并验证了考虑多种频率耦合原因情况下的并网逆变器的频率耦合特性解析模型。基于推导的模型,进而分析了频率耦合特性的影响因素,以及频率耦合对并网逆变器系统稳定性的影响。
Impedance-based method is widely applied to analyze the stability of grid-inverter interconnected system. In impedance modeling, it is assumed that a three-phase interconnected system can be decoupled into a positive-and a negative-sequence subsystem, and each subsystem has the single-in-single-out characteristic in the frequency domain.However, if there is frequency coupling in the system, the positive-and negative-sequence impedance models are no longer decoupled, and the original stability analysis method is no longer applicable. In this paper, the frequency coupling characteristic of grid-connected inverter was studied, and an analytical model with considerations of multiple causes to frequency coupling was modeled and validated. Based on this derived model, the influencing factors of frequency coupling were analyzed, and the system stability was also analyzed.
Impedance-based method is widely applied to analyze the stability of grid-inverter interconnected system. In impedance modeling, it is assumed that a three-phase interconnected system can be decoupled into a positive-and a negative-sequence subsystem, and each subsystem has the single-in-single-out characteristic in the frequency domain.However, if there is frequency coupling in the system, the positive-and negative-sequence impedance models are no longer decoupled, and the original stability analysis method is no longer applicable. In this paper, the frequency coupling characteristic of grid-connected inverter was studied, and an analytical model with considerations of multiple causes to frequency coupling was modeled and validated. Based on this derived model, the influencing factors of frequency coupling were analyzed, and the system stability was also analyzed.
引文
[1]曾正,赵荣祥,汤胜清,等.可再生能源分散接入用先进并网逆变器研究综述[J].中国电机工程学报,2013,33(24):1-12.Zeng Zheng,Zhao Rongxiang,Tang Shengqing,et al.An overview on advanced grid-connected inverters used for decentralized renewable energy resources[J].Proceedings of the CSEE,2013,33(24):1-12(in Chinese).
[2]陈亚爱,刘劲东,周京华.太阳能并网逆变器故障穿越控制策略[J].中国电机工程学报,2014,34(21):3405-3412.Chen Yaai,Liu Jingdong,Zhou Jinghua.Fault ridethrough control strategy for solar grid-connected inverters[J].Proceedings of the CSEE,2014,34(21):3405-3412(in Chinese).
[3]于洋,徐政,徐谦,等.永磁直驱式风机采用混合直流并网的控制策略[J].中国电机工程学报,2016,36(11):2863-2870.Yu Yang,Xu Zheng,Xu Qian,et al.A control strategy for integration of permanent magnet direct-driven wind turbines through a hybrid HVDC system[J].Proceedings of the CSEE,2016,36(11):2863-2870(in Chinese).
[4]刘宏达,周磊.多功能并网逆变器及其在接入配电系统的微电网中的应用[J].中国电机工程学报,2014,34(16):2649-2658.Liu Hongda,Zhou Lei.A multi-functional grid-connected inverter and its application in micro-grid access to distribution system[J].Proceedings of the CSEE,2014,34(16):2649-2658(in Chinese).
[5]Cespedes M,Sun J.Impedance shaping of three-phase grid-parallel voltage-source converters[C]//Proceedings of Applied Power Electronics Conference and Exposition(APEC),Orlando,USA,2012.
[6]Cespedes M,Sun J.Impedance modeling and analysis of grid-connected voltage-source converters[J].IEEETransactions on Power Electronics,2013,29(3):1254-1261.
[7]Cespedes M,Sun J.Mitigation of inverter-grid harmonic resonance by narrowband damping[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):1024-1031.
[8]Vieto I,Sun J.Small-signal impedance modelling of type-III wind turbine[C]//Proceedings of Power&Energy Society General Meeting,Denver,USA,2015.
[9]Vieto I,Sun J.Damping of subsynchronous resonance involving type-III wind turbines[C]//Proceedings of Control and Modeling for Power Electronics,Vancouver,Canada.
[10]吕敬,蔡旭.基于谐波线性化的模块化多电平换流器阻抗建模[J].电力系统自动化,2017,41(4):136-142.LüJing,Cai Xu.Harmonic linearization based impedance modeling of modular multilevel converters[J].Automation of Electric Power Systems,2017,41(4):136-142(in Chinese).
[11]吕敬,蔡旭,张占奎,等.海上风电场经MMC-HVDC并网的阻抗建模及稳定性分析[J].电机工程学报,2016,36(14):3771-3781.LüJing,Cai Xu,Zhang Zhankui,et al.Impedance modeling and stability analysis of MMC-based HVDC for offshore wind farms[J].Proceedings of the CSEE,2016,36(14):3771-3781(in Chinese).
[12]Sun J.Impedance-based stability criterion for gridconnected inverters[J].IEEE Transactions on Power Electronics,2011,26(11):3075-3078.
[13]Xu Y,Nian N,Sun J.Cross coupling of grid-connected inverter impedance over frequency-phenomena,effects and modeling[C]//Proceedings of Wind Integration Workshop,Vienna,Austria,2016.
[14]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].IEEEJournal of Emerging an Selected Topics in Power Electronics,2016,4(4):1383-1396.
[15]Bakhshizadeh M,Wang W,Blaabjerg F,et al.Couplings in phase domain impedance modeling of grid-connected converters[J].IEEE Transactions on Power Electronics,2016,31(19):6792-6796.
[16]Shah S,Parsa L.Impedance modeling of three-phase voltage source converters in dq,sequence,and phasor domain[J].IEEE Transactions on Energy Conversion,2017,32(3):1139-1150.
[17]Harnefors L.Modeling of three-phase dynamic systems using complex transfer functions and transfer matrices[J].IEEE Transactions on Industrial Electronics,2007,54(4):2239-2248.
[2]陈亚爱,刘劲东,周京华.太阳能并网逆变器故障穿越控制策略[J].中国电机工程学报,2014,34(21):3405-3412.Chen Yaai,Liu Jingdong,Zhou Jinghua.Fault ridethrough control strategy for solar grid-connected inverters[J].Proceedings of the CSEE,2014,34(21):3405-3412(in Chinese).
[3]于洋,徐政,徐谦,等.永磁直驱式风机采用混合直流并网的控制策略[J].中国电机工程学报,2016,36(11):2863-2870.Yu Yang,Xu Zheng,Xu Qian,et al.A control strategy for integration of permanent magnet direct-driven wind turbines through a hybrid HVDC system[J].Proceedings of the CSEE,2016,36(11):2863-2870(in Chinese).
[4]刘宏达,周磊.多功能并网逆变器及其在接入配电系统的微电网中的应用[J].中国电机工程学报,2014,34(16):2649-2658.Liu Hongda,Zhou Lei.A multi-functional grid-connected inverter and its application in micro-grid access to distribution system[J].Proceedings of the CSEE,2014,34(16):2649-2658(in Chinese).
[5]Cespedes M,Sun J.Impedance shaping of three-phase grid-parallel voltage-source converters[C]//Proceedings of Applied Power Electronics Conference and Exposition(APEC),Orlando,USA,2012.
[6]Cespedes M,Sun J.Impedance modeling and analysis of grid-connected voltage-source converters[J].IEEETransactions on Power Electronics,2013,29(3):1254-1261.
[7]Cespedes M,Sun J.Mitigation of inverter-grid harmonic resonance by narrowband damping[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):1024-1031.
[8]Vieto I,Sun J.Small-signal impedance modelling of type-III wind turbine[C]//Proceedings of Power&Energy Society General Meeting,Denver,USA,2015.
[9]Vieto I,Sun J.Damping of subsynchronous resonance involving type-III wind turbines[C]//Proceedings of Control and Modeling for Power Electronics,Vancouver,Canada.
[10]吕敬,蔡旭.基于谐波线性化的模块化多电平换流器阻抗建模[J].电力系统自动化,2017,41(4):136-142.LüJing,Cai Xu.Harmonic linearization based impedance modeling of modular multilevel converters[J].Automation of Electric Power Systems,2017,41(4):136-142(in Chinese).
[11]吕敬,蔡旭,张占奎,等.海上风电场经MMC-HVDC并网的阻抗建模及稳定性分析[J].电机工程学报,2016,36(14):3771-3781.LüJing,Cai Xu,Zhang Zhankui,et al.Impedance modeling and stability analysis of MMC-based HVDC for offshore wind farms[J].Proceedings of the CSEE,2016,36(14):3771-3781(in Chinese).
[12]Sun J.Impedance-based stability criterion for gridconnected inverters[J].IEEE Transactions on Power Electronics,2011,26(11):3075-3078.
[13]Xu Y,Nian N,Sun J.Cross coupling of grid-connected inverter impedance over frequency-phenomena,effects and modeling[C]//Proceedings of Wind Integration Workshop,Vienna,Austria,2016.
[14]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].IEEEJournal of Emerging an Selected Topics in Power Electronics,2016,4(4):1383-1396.
[15]Bakhshizadeh M,Wang W,Blaabjerg F,et al.Couplings in phase domain impedance modeling of grid-connected converters[J].IEEE Transactions on Power Electronics,2016,31(19):6792-6796.
[16]Shah S,Parsa L.Impedance modeling of three-phase voltage source converters in dq,sequence,and phasor domain[J].IEEE Transactions on Energy Conversion,2017,32(3):1139-1150.
[17]Harnefors L.Modeling of three-phase dynamic systems using complex transfer functions and transfer matrices[J].IEEE Transactions on Industrial Electronics,2007,54(4):2239-2248.