非理想电网下并网逆变器复数控制器及其控制簇研究
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摘要
针对电网出现的频率偏移、不平衡及含有低次谐波等问题,提出一种基于αβ静止坐标系可消除交流稳态误差的通用型复数控制器,此通用型复数控制器可等效变换成正序准PCI(QPCI)、正负序解耦准PCI、正负序2阶解耦准PCI以及高次正负序解耦准PCI网逆变器对称、稳定输出。最后在三相并网逆变器基础上建立仿真和实验,验证通用型复数控制器及其控制簇的正确性及优越性。
A general complex controller is presented in this paper,which can transform into positive sequence quasiproportional complex integral(PQPCI),positive and negative sequences decoupled quasi-proportional complex Integral(PNQPCI),positive and negative sequences 2-order decoupled quasi-proportional complex integral(PN2OQPCI)and high-order positive and negative sequences decoupled quasi-proportional complex integral(HOPNQPCI) under different conditions. They become a series of control cluster to ensure grid-connected inverter operate steadily under nonideal grid voltages. Finally simulation and experimental results verify the effectiveness of the proposed method.
A general complex controller is presented in this paper,which can transform into positive sequence quasiproportional complex integral(PQPCI),positive and negative sequences decoupled quasi-proportional complex Integral(PNQPCI),positive and negative sequences 2-order decoupled quasi-proportional complex integral(PN2OQPCI)and high-order positive and negative sequences decoupled quasi-proportional complex integral(HOPNQPCI) under different conditions. They become a series of control cluster to ensure grid-connected inverter operate steadily under nonideal grid voltages. Finally simulation and experimental results verify the effectiveness of the proposed method.
引文
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[14]彭秋波,盘宏斌,刘勇.LCL型三相并网逆变器双闭环解耦控制器设计[J].电工技术学报,2014,29(4):103-110.[14]Peng Qiubo,Pan Hongbin,Liu Yong.Design of dual loop decoupling controller in LCL three phase grid connected inverter[J].Transactions of China Electrotechnical Society,2014,29(4):103-110.
[15]王德玉,刘文钊,郭小强,等.非理想电网电压情况下并网变换器高阶解耦复数滤波并网同步技术[J].中国电机工程学报,2015,35(10):2577-2583.[15]Wang Deyu,Liu Wenzhao,Guo Xiaoqiang,et al.Grid Synchronization technique with high-order decoupled complex filters for grid-connected converters under nonideal grid voltages[J].Proceedings of the CSEE,2015,35(10):2577-2583.
[2]Biricik S,Redif S,Ozerdem O C,et al.Control of the shunt active power filter under nonideal grid voltage and unbalanced load conditions[A].Power Engineering Conference(UPEC)[C],Dublin,Ireland,2013.
[3]Njafi A,Iskender I,Gencet N,et al.Evaluating and derating of three-phase distribution transformer under unbalanced voltage and unbalance load using finite element method[A].Power Engineering and Optimization Conference(PEOCO)[C],Langkawi,Malaysia,2014.
[4]Zhu Yixin,Zhuo Fang,Wang Feng,et al.A virtual impedance optimization method for reactive power sharing in networked microgrid[J].IEEE Transactions on Power Electronics,2015,31(4):2890-2894.
[5]Busada C A,Jorge S G,Leon A E,et al.Current controller based on reduced order generalized integrators for distributed generation systems[J].IEEETransactions on Industrial Electronics,2012,59(7):2898-2909.
[6]阳同光,桂卫华.电网不平衡情况下并网逆变器控制策略综述[J].电工技术学报,2015,30(14):241-246.[6]Yang Tongguang,Gui Weihua.An overview on control strategies of grid-connected inverter under unbalanced voltage conditions[J].Transactions of China Electrotechnical Society,2015,30(14):241-246.
[7]Martinez M I,Susperregui A,Tapia G,et al.Slidingmode control of a wind turbine-driven double-fed induction generator under non-ideal grid voltages[J].Renewable Power Generation Iet,2013,7(4):370-379.
[8]Huang Meng,Tse C K,Wong Siu-Chung,et al.Lowfrequency Hopf bifurcation and its effects on stability margin in three-phase PFC power supplies connected to non-ideal power grid[J].IEEE Transactions on Circuits and Systems I:Regular Papers,2013,60(12):3328-3340.
[9]Xu Jinming,Tang Ting,Xie Shaojun,et al.Research on low-order current harmonics rejections for gridconnected LCL-filtered inverters[J].IET Power Electronics,2014,7(5):1127-1234.
[10]Hu Jiabing,He Yikang.Modeling and control of gridconnected voltage-sourced converters under generalized unbalanced operation conditions[J].IEEE Transactions on Energy conversion,2008,23(3):903-1003.
[11]杭丽君,李宾,黄龙,等.一种可再生能源并网逆变器的多谐振PR电流控制技术[J].中国电机工程学报,2012,32(12):51-58.[11]Hang Lijun,Li Bin,Huang Long,et al.A multiresonant PR current controller for grid-connected inverters in renewable energy systems[J].Proceedings of the CSEE,2012,32(12):51-58.
[12]梁营玉,张涛,刘建政,等.不平衡电网电压下模块化多电平换流器的环流抑制策略[J].电工技术学报,2016,31(9):120-128.[12]Liang Yingyu,Zhang Tao,Liu Jianzheng,et al.Acirculating current suppressing method for modular multilevel converter under unbalanced grid voltage[J].Transactions of China Electrotechnical Society,2016,31(9):120-128.
[13]赵新,金新民,周飞,等.基于比例积分-降阶谐振调节器的并网逆变器不平衡控制[J].中国电机工程学报,2013,33(15):38-44.[13]Zhao Xin,Jin Xinmin,Zhou Fei,et al.Unbalanced control of grid-connected inverters based on proportion integraland reduced order resonant controllers[J].Proceedings of the CSEE,2013,33(15):38-44.
[14]彭秋波,盘宏斌,刘勇.LCL型三相并网逆变器双闭环解耦控制器设计[J].电工技术学报,2014,29(4):103-110.[14]Peng Qiubo,Pan Hongbin,Liu Yong.Design of dual loop decoupling controller in LCL three phase grid connected inverter[J].Transactions of China Electrotechnical Society,2014,29(4):103-110.
[15]王德玉,刘文钊,郭小强,等.非理想电网电压情况下并网变换器高阶解耦复数滤波并网同步技术[J].中国电机工程学报,2015,35(10):2577-2583.[15]Wang Deyu,Liu Wenzhao,Guo Xiaoqiang,et al.Grid Synchronization technique with high-order decoupled complex filters for grid-connected converters under nonideal grid voltages[J].Proceedings of the CSEE,2015,35(10):2577-2583.