三相四桥臂逆变器的复合控制
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摘要
随着风能、太阳能等清洁能源在电网中的应用,逆变器不可或缺.电网中的谐波和不平衡负载影响电网的电能质量,因此逆变器的控制策略及控制方法尤为重要.为提高电能质量,以三相四桥臂逆变器为模型,提出了比例积分PI、矢量谐振(vector resonant,VR)控制和重复(repetitive control,RC)控制相结合的复合控制方法.其中比例积分控制器能够抑制直流分量的干扰;矢量谐振控制器能够抑制特定频率且含量较高的谐波;重复控制器抑制多次且含量较低的谐波并减小稳态误差.仿真结果验证了所提控制方法能有效提高逆变器输出电压电流波形质量.
In the application of wind,solar and other clean energy in the grid,inverter is indispensable.Harmonic wave and unbalanced load affect the output of the inverter,the performance of the inverter control strategy directly affects the power quality.By combining proportional integral(PI),vector resonance(VR)control and repetitive control(RC),the compound control method is proposed.PI restrain the interference of DC component,the VR controller suppresses the low harmonics.RC suppresses the higher harmonics and reduce the static error,and improve the waveform qualities of converter output voltage and current.The simulation results verify the effectiveness of the proposed control method.
In the application of wind,solar and other clean energy in the grid,inverter is indispensable.Harmonic wave and unbalanced load affect the output of the inverter,the performance of the inverter control strategy directly affects the power quality.By combining proportional integral(PI),vector resonance(VR)control and repetitive control(RC),the compound control method is proposed.PI restrain the interference of DC component,the VR controller suppresses the low harmonics.RC suppresses the higher harmonics and reduce the static error,and improve the waveform qualities of converter output voltage and current.The simulation results verify the effectiveness of the proposed control method.
引文
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[9]陈思哲,章云,吴捷.不平衡电网电压下双馈风力发电系统的比例-积分-谐振并网控制[J].电网技术,2012,36(08):62-68.DOI:10.13335/j.1000-3673.pst.2012.08.018.CHEN S Z,ZHANG Y,WU J.Proportional-Integral-Resonant Grid-Connection Control for Doubly-Fed Wind Power Generation System Under Unbalanced Grid Voltage[J].Power System Technology,2012,36(08):62-68.DOI:10.13335/j.1000-3673.pst.2012.08.018.
[10]杨苹,郑远辉,徐志荣,等.基于准比例谐振积分与重复控制的光伏并网逆变器研究[J].可再生能源,2015,33(7):993-998.DOI:10.13941/j.cnki.21-1469/tk.2015.07.006
[11]郝鹏.三相并网逆变器电流控制技术研究[D].天津:天津大学,2014.HAO P.The research of three-phase grid inverter current control technology[D].Tianjin:Tianjin University,2013.
[12]竺明哲,叶永强,赵强松,等.抗电网频率波动的重复控制参数设计方法[J].中国电机工程学报,2016,36(14):3857-3867.DOI:10.13334/j.0258-8013.pcsee.151163.ZHU M Z,YE Y Q,ZHAO Q S,et al.A design method of repetitive controller against variation of grid frequency[J].Proceedings of the CSEE,2016,36(14):3857-3867.DOI:10.13334/j.0258-8013.pcsee.151163.
[2]贺益康,徐海亮.双馈风电机组电网适应性问题及其谐振控制解决方案[J].中国电机工程学报,2014,34(29):5188-5203.DOI:10.13334/j.0258-8013.seep.2014.29.021.
[3]徐海亮.双馈风电变流器的谐振控制技术研究[D].杭州:浙江大学,2014.XU H L.Investigation on resonant control technologies of dfig-based wind power converters[D].Hangzhou:Zhejiang Unversity,2014.
[4]全相军,窦晓波,龙昌明,等.逆变器电压复变量谐振优化控制[J].中国电机工程学报,2016,36(15):4214-4224.DOI:10.13334/j.0258-8013.seep.160277.QUAN X J,DOU X B,LONG C M,et al.Optimal design for inverts based on complex variable resonant controllers[J].Proceedings of the CSEE,2016,36(15):4214-4224.DOI:10.13334/j.0258-8013.pcsee.160277.
[5]S KARYS.Advanced control and design methods of the auxiliary resonant commutated pole inverter[J].Bulletin of the Polish Academy of Sciences Technical Sciences,2015,63(2):489-494.DOI:10.1515/bpasts-2015-0056.
[6]粟梅,王辉,孙尧,等.基于改进重复控制器的三相四线逆变器设计[J].中国电机工程学报,2010,30(24):29-35.DOI:10.13334/j.0258-8013.seep.2010.24.017.SU M,WANG H,SUN Y,et al.Design of three-phase four-leg inverter based on modified repetitive controller[J].Proceedings of the CSEE,2010,30(24):29-35.DOI:10.13334/j.0258-8013.pcsee.2010.24.017.
[7]曹以龙,杨敏杰,江友华,等.基于重复原理的无差拍控制单相逆变器[J].电气传动,2014(09):54-59.
[8]石存玮.逆变器的三相不平衡负载控制方法研究[D].重庆:西南交通大学,2014.SHI C W.Research on the control method of three-phase inverter under unbalanced loads[D].Chongqing:Southwest Jiaotong Unversity,2014.
[9]陈思哲,章云,吴捷.不平衡电网电压下双馈风力发电系统的比例-积分-谐振并网控制[J].电网技术,2012,36(08):62-68.DOI:10.13335/j.1000-3673.pst.2012.08.018.CHEN S Z,ZHANG Y,WU J.Proportional-Integral-Resonant Grid-Connection Control for Doubly-Fed Wind Power Generation System Under Unbalanced Grid Voltage[J].Power System Technology,2012,36(08):62-68.DOI:10.13335/j.1000-3673.pst.2012.08.018.
[10]杨苹,郑远辉,徐志荣,等.基于准比例谐振积分与重复控制的光伏并网逆变器研究[J].可再生能源,2015,33(7):993-998.DOI:10.13941/j.cnki.21-1469/tk.2015.07.006
[11]郝鹏.三相并网逆变器电流控制技术研究[D].天津:天津大学,2014.HAO P.The research of three-phase grid inverter current control technology[D].Tianjin:Tianjin University,2013.
[12]竺明哲,叶永强,赵强松,等.抗电网频率波动的重复控制参数设计方法[J].中国电机工程学报,2016,36(14):3857-3867.DOI:10.13334/j.0258-8013.pcsee.151163.ZHU M Z,YE Y Q,ZHAO Q S,et al.A design method of repetitive controller against variation of grid frequency[J].Proceedings of the CSEE,2016,36(14):3857-3867.DOI:10.13334/j.0258-8013.pcsee.151163.