基于节点阻抗矩阵的直流配电网谐振特性分析
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摘要
为分析直流配电网谐振特性,在序分量动态相量谐波分析模型的基础上,分别建立直流配电网中并网换流器、交流负载接口换流器以及直流负载接口双向DC-DC换流器等关键元件的诺顿等值电路模型,进而构成直流配电网的等值电路模型。基于等值电路模型,形成直流配电网的节点阻抗矩阵。通过分析节点阻抗矩阵中各元素的频率特性,得到整个直流配电网的谐振特性,包括换流器自身及换流器间的谐波相互作用关系。接着深入研究影响直流配电网谐振特性的主要因素。通过仿真验证理论分析的正确性和有效性。
To analyze the resonance characteristics of DC distribution, firstly, a Norton equivalent circuit model of grid-connected converter, AC load interface converter and DC load interface bidirectional DC-DC were built based on the harmonic analysis model with dynamic phasor sequence components(DPSCs), respectively. Thus, the equivalent circuit model of DC distribution network was obtained. Secondly,based on the equivalent circuit model, the system node impedance was formed. Then, by analyzing the frequency characteristics of each element in the node impedance matrix,the resonance characteristics of the entire DC distribution network were obtained, including the harmonic interaction between different converter and the harmonic interaction of converter itself. Thirdly, the main factors affecting the resonance characteristics of DC distribution were deeply studied. Finally, the correctness and validity of the theoretical analysis were verified by simulation.
To analyze the resonance characteristics of DC distribution, firstly, a Norton equivalent circuit model of grid-connected converter, AC load interface converter and DC load interface bidirectional DC-DC were built based on the harmonic analysis model with dynamic phasor sequence components(DPSCs), respectively. Thus, the equivalent circuit model of DC distribution network was obtained. Secondly,based on the equivalent circuit model, the system node impedance was formed. Then, by analyzing the frequency characteristics of each element in the node impedance matrix,the resonance characteristics of the entire DC distribution network were obtained, including the harmonic interaction between different converter and the harmonic interaction of converter itself. Thirdly, the main factors affecting the resonance characteristics of DC distribution were deeply studied. Finally, the correctness and validity of the theoretical analysis were verified by simulation.
引文
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[17]焦晋荣,贾清泉,王宁,等.柔性直流配电网纹波形成机理与叠加特性[J].电网技术,2017,41(6):1726-1733.Jiao Jinrong,Jia Qingquan,Wang Ning,et al.Ripple formation mechanism and superimposition characteristics for Flexible DC distribution network[J].Power System Technology,2017,41(6):1726-1733(in Chinese).
[18]王宁,袁杰,焦晋荣,等.直流配电网多变流器纹波谐振问题研究[J].电力自动化设备,2017,37(7):77-83.Wang Ning,Yuan Jie,Jiao Jinrong,et al.Ripple resonance of DC distribution network with multiple converters[J].Electric Power Automation Equipment,2017,37(7):77-83(in Chinese).
[19]Zhong Qing,Lin Lingxue,Wang Gang,et al.Harmonic analysis model for voltage source converter under unbalanced conditions[J].IET Generation,Transmission&Distribution,2015,9(1):12-21.
[20]Zhong Qing,Feng Junjie,Lin Linxue,et al.Graphical presentation of harmonic operating principles in voltage source converter with sparse vector methods[J].IETGeneration,Transmission&Distribution,2017,11(4):1033-1038.
[2]吴卫民,何远彬,耿攀,等.直流微网研究中的关键技术[J].电工技术学报,2012,27(1):98-106,113.Wu Weimin,He Yuanbin,Geng Pan,et al.Key technologies for DC micro-grids[J].Transactions of China Electrotechnical Society,2012,27(1):98-106,113(in Chinese).
[3]陈鹏伟,肖湘宁,陶顺.直流微网电能质量问题探讨[J].电力系统自动化,2016,40(10):148-158.Chen Pengwei,Xiao Xiangning,Tao Shun.Discussion on power quality problems for DC microgrid[J].Automation of Power System,2016,40(10):148-158(in Chinese).
[4]孙鹏飞,贺春光,邵华,等.直流配电网研究现状与发展[J].电力自动化设备,2016,36(6):64-73.Sun Pengfei,He Chunguang,Shao Hua,et al.Research status and development of DC distribution network[J].Electric Power Automation Equipment,2016,36(6):64-73(in Chinese).
[5]Kakigano H.Miura Y,Ise T.Low-voltage bipolar-type DC microgrid for super high quality distribution[J].IEEETransactions on Power Electronics,2010,25(12):3066-3075.
[6]王成山,李微,王议锋,等.直流微电网母线电压波动分类及抑制方法综述[J].中国电机工程学报,2017,37(1):84-97.Wang Chengshan,Li Wei,Wang Yifeng,et al.DC Bus voltage fluctuation classification and restraint methods review for DC microgrid[J].Proceedings of the CSEE,2017,37(1):84-97(in Chinese).
[7]Jamshidpour E,Nahid-Mobarakeh B,Poure P,et al.Distributed active resonance suppression in hybrid DCpower systems under unbalanced load conditions[J].IEEETransactions on Power Electronics,2013,28(4):1833-1842.
[8]Tahim A P N,Pagano D J,Lenz E,et al.Modeling and stability analysis of islanded DC microgrids under droop control[J].IEEE Transactions on Power Electronics,2015,30(8):4597-4607.
[9]许德志,汪飞,毛华龙,等.多并网逆变器与电网的谐波交互建模与分析[J].中国电机工程学报,2013,33(12):64-71.Xu Dezhi,Wang Fei,Mao Hualong,et al.Modeling and analysis of harmonic interaction between multiple grid-connected inverters and the utility grid[J].Proceedings of the CSEE,2013,33(12):64-71(in Chinese).
[10]钟庆,冯俊杰,王钢,等.含多电压源型换流器配电网高频谐振特性分析[J].电力系统自动化,2017,41(5):99-105.Zhong Qing,Feng Junjie,Wang Gang,et al.Analysis on high frequency resonance characteristics of distribution network with multiple voltage source converters[J].Automation of Electric Power Systems,2017,41(5):99-105(in Chinese).
[11]郭力,冯怿彬,李霞林,等.直流微电网稳定性分析及阻尼控制方法研究[J].中国电机工程学报,2016,36(4):927-936.Guo Li,Feng Yibin,Li Xialin,et al.Stability analysis and research of active damping method for DC microgrids[J].Proceedings of the CSEE,2016,36(4):927-936(in Chinese).
[12]Wu Mingfei,Lu D D C.A novel stabilization method of LC input filter with constant power loads without load performance compromise in DC microgrids[J].IEEETransactions on Industrial Electronics,2015,62(7):4552-4562.
[13]金阳忻,徐习东.采用下垂控制的直流配电网小干扰稳定性分析[J].电力系统自动化,2016,40(14):78-85.Jin Yangxin,Xu Xidong.Small-signal stability analysis of DC distribution network adopting droop control[J].Automation of Electric Power Systems,2016,40(14):78-85(in Chinese).
[14]Lu Xiaonan,Sun Kai,Guerreno J M,et al.Stability enhancement based on virtual impedance for DCmicrogrids with constant power loads[J].IEEETransactions on Smart Grid,2015,6(6):2770-2783.
[15]Rashidirad N,Hamzeh M,Sheshyekani K,et al.High-frequency oscillations and their leading causes in DC microgrids[J].IEEE Transactions on Energy Conversion,2017,32(4):1479-1491.
[16]Liu Yuchao,Raza A,Rouzbehi K,et al.Dynamic resonance analysis and oscillation damping of multiterminal DC grids[J].IEEE Access,2017,5:16974-16984.
[17]焦晋荣,贾清泉,王宁,等.柔性直流配电网纹波形成机理与叠加特性[J].电网技术,2017,41(6):1726-1733.Jiao Jinrong,Jia Qingquan,Wang Ning,et al.Ripple formation mechanism and superimposition characteristics for Flexible DC distribution network[J].Power System Technology,2017,41(6):1726-1733(in Chinese).
[18]王宁,袁杰,焦晋荣,等.直流配电网多变流器纹波谐振问题研究[J].电力自动化设备,2017,37(7):77-83.Wang Ning,Yuan Jie,Jiao Jinrong,et al.Ripple resonance of DC distribution network with multiple converters[J].Electric Power Automation Equipment,2017,37(7):77-83(in Chinese).
[19]Zhong Qing,Lin Lingxue,Wang Gang,et al.Harmonic analysis model for voltage source converter under unbalanced conditions[J].IET Generation,Transmission&Distribution,2015,9(1):12-21.
[20]Zhong Qing,Feng Junjie,Lin Linxue,et al.Graphical presentation of harmonic operating principles in voltage source converter with sparse vector methods[J].IETGeneration,Transmission&Distribution,2017,11(4):1033-1038.
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