基于输出阻抗建模的并网系统低次谐波预测模型
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摘要
针对并网系统谐波预测问题,提出引入逆变器实际输出谐波电流建立谐波阻抗模型的方案。首先分析并网系统谐波谐振原理,对单相LCL型并网逆变器进行阻抗建模。为提高阻抗模型准确性,在分析逆变器低频特性的基础上,将单个逆变器并网谐波电流考虑到阻抗模型中,建立谐波阻抗模型,与电路模型仿真对比结果验证了模型的有效性。利用提出的谐波阻抗模型,对多逆变器并网系统进行谐波交互分析及谐波预测建模,以8个并网逆变器为例,分析谐振对并网谐波电流和公共接入点(PCC)处谐波电压的影响,谐波预测模型和电路模型对比仿真结果验证了该多逆变器谐波预测模型的有效性和准确性。
Aimed at harmonic prediction of grid-connected systems,a harmonic impedance modeling scheme is proposed based on output harmonic current of inverter. The grid-connected system harmonic resonance theory was analyzed for impedance modeling of single-phase LCL grid-connected inverter. The low frequency characteristic of inverter was analyzed. Further,the harmonic current of single LCL gridconnected inverter was considered to obtain the harmonic impedance model,which is in good agreement with the simulation results of circuit model. The harmonic impedance model was used for harmonic interaction analysis and harmonic prediction modeling of multi-inverter grid-connected systems. An example of eight grid-connected inverters was proposed,and the resonance effect was analyzed for harmonic current and harmonic voltage over point of common coupling( PCC). This harmonic prediction model was compared with circuit model to prove its effectiveness and accuracy.
Aimed at harmonic prediction of grid-connected systems,a harmonic impedance modeling scheme is proposed based on output harmonic current of inverter. The grid-connected system harmonic resonance theory was analyzed for impedance modeling of single-phase LCL grid-connected inverter. The low frequency characteristic of inverter was analyzed. Further,the harmonic current of single LCL gridconnected inverter was considered to obtain the harmonic impedance model,which is in good agreement with the simulation results of circuit model. The harmonic impedance model was used for harmonic interaction analysis and harmonic prediction modeling of multi-inverter grid-connected systems. An example of eight grid-connected inverters was proposed,and the resonance effect was analyzed for harmonic current and harmonic voltage over point of common coupling( PCC). This harmonic prediction model was compared with circuit model to prove its effectiveness and accuracy.
引文
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[13]鲍陈磊,阮新波,王学华,等.基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计[J].中国电机工程学报,2012,32(25):135.BAO Chenlei,RUAN Xinbo,WANG Xuehua,et al. Design of grid-connected inverters with LCL filters based on PI regulator and capacitor current feedback active damping[J]. Proceedings of the CSEE,2012,32(25):135.
[14] AGORRETA J L,BORREGA M,LOPEZ J,et al. Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PV plants[J]. IEEE Transactionson Power Electronics,2011,26(3):774.
[15] SUN J. Impedance-based stability criterion for grid-connected inverters[J]. IEEE Transactions on Power Electronics,2011,26(11):3075.
[16] CESPEDES M,SUN J. Impedance modeling and analysis of gridconnected voltage-source converters[J]. IEEE Transactions on Power Electronics,2014,29(3):1254.
[2]王宝忠,王志兵.基于模糊控制的光伏系统最大功率点跟踪[J].哈尔滨理工大学学报,2012,17(4):13.WANG Baozhong,WANG Zhibing. Maximum power point tracking by using fuzzy control for photovoltaic power system[J]. Journal of Harbin University of Science and Technology,2012,17(4):13.
[3]谢文浩,王建赜,纪延超,等.一种LCL型并网逆变器的复合阻抗重塑方法[J].电机与控制学报,2018,22(10):35.XIE Wenhao,WANG Jianze,JI Yanchao,et al. Composite impedance reshaping method for LCL-type grid-tied inverter[J]. Electric Machines and Control,2018,22(10):35.
[4] WANG Fei,LDUARTE J,AMHENDRIX M,et al. Modeling and analysis of grid harmonic distortion impact of aggregated DG inverters[J]. IEEE Transactionson Power Electronics,2011,26(3):786.
[5] XU Dezhi,Wang Fei,Ruan Yi,et al. Output impedance modeling of grid-connected inverters considering nonlinear effects[C]//Control and Modeling for Power Electronics,June 10-13,2012,Kyoto,Japan. 2012:1-7.
[6]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.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.
[7]许德志,汪飞,阮毅,等.多逆变器并网系统输出阻抗建模与谐波交互[J].电机与控制学报,2014,18(2):1.XU Dezhi,WANG Fei,RUAN Yi,et al. Output impedance modeling and harmonic interactions of multiple inverters grid-connected system[J]. Electric Machines and Control,2014,18(2):1.
[8]张兴,余畅舟,刘芳,等.光伏并网多逆变器并联建模及谐振分析[J].中国电机工程学报,2014,34(3):336.ZHANG Xing,YU Changzhou,LIU Fang,et al. Modeling and resonance analysis of multi-paralleled grid-tied inverters in PV systems[J]. Proceedings of the CSEE,2014,34(3):336.
[9] AU T M,MILANOVIC V J. Development of stochastic aggregate harmonic load model based on field measurements[J]. IEEE Transactions on Power Delivery,2007,22(1):323.
[10] VASANASONG E,SPOONSER E D. The prediction of net harmonic currents produced by large numbers of residential PV inverters:Syndney Olympic Village case study[C]//9thInternational Conference on Harmonics and Quality of Power,October1-4,2000,Orlando,USA. 2000:116–121.
[11] YAHYAIE F,LEHN W P. Using frequency coupling matrix techniques for the analysis of harmonic interactions[J]. IEEE Transactions on Power Delivery,2016,31(1):112.
[12]汪飞,冯夏云,吴春华,等.多反激式微型逆变器并网谐波交互研究[J].中国电机工程学报,2016,36(3):712.WANG Fei,FENG Xiayun,WU Chunhua,et al. Research on grid harmonic interaction of multiple flyback micro-inverters[J].Proceedings of the CSEE,2016,36(3):712.
[13]鲍陈磊,阮新波,王学华,等.基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计[J].中国电机工程学报,2012,32(25):135.BAO Chenlei,RUAN Xinbo,WANG Xuehua,et al. Design of grid-connected inverters with LCL filters based on PI regulator and capacitor current feedback active damping[J]. Proceedings of the CSEE,2012,32(25):135.
[14] AGORRETA J L,BORREGA M,LOPEZ J,et al. Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PV plants[J]. IEEE Transactionson Power Electronics,2011,26(3):774.
[15] SUN J. Impedance-based stability criterion for grid-connected inverters[J]. IEEE Transactions on Power Electronics,2011,26(11):3075.
[16] CESPEDES M,SUN J. Impedance modeling and analysis of gridconnected voltage-source converters[J]. IEEE Transactions on Power Electronics,2014,29(3):1254.