单管准谐振光伏微逆变器用变压器优化研究
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摘要
单管准谐振光伏微逆变器的电路增益不仅与变压器匝比有关,还与逆变器的开关频率有关,为此,其变压器设计既不能遵循传统单端型和双端型高频变压器的设计方法,也不能遵循2个耦合电感的设计方法。针对此,设计了一款适合该逆变电路的松耦合变压器。通过分析单管准谐振光伏微逆变器的工作原理,给出其等效电路,并推导出电路增益;然后选择UY型和EE型磁心,设计了2种松耦合变压器的参数,并运用JMAG有限元仿真软件对这2种变压器进行损耗和温度场仿真分析;最后绕制UY型和EE型磁心的变压器,将其用于300 W单管准谐振光伏微逆变器,并进行实验测试。实验结果验证了UY型磁心松耦合变压器的样机效率比EE型磁心松耦合变压器的样机效率高,这为隔离型光伏微逆变器的松耦合变压器磁心选择提供了参考方法。
The circuit gain of the single-tube quasi-resonant photovoltaic micro-inverter is not only related to transformer turn ratio, but also related to switching frequency of the inverter. For this reason, design of its transformer can neither follow design methods for traditional single-ended and double-ended high-frequency transformers, nor follow the method for designing two coupled inductors. Therefore, this paper designs a kind of loose coupling transformer suitable for this micro-inverter. It analyzes working principle of the single-tube quasi-resonant photovoltaic micro-inverter, puts forward its equivalent circuit and derives the circuit gain. Then the paper chooses UY typed and EE typed magnetic cores to design parameters of two kinds of loose coupling transformers and uses JMAG finite element software to make simulated analysis of transformer loss and temperature field. Finally, transformer with UY typed core and EE typed core are made for 300 W single-tube quasi-resonant photovoltaic micro-inverter and experimental test. The test result indicates that efficiency of the loose coupling transformer with UY typed core is higher than that of the same kind transformer with EE typed core, which has provided reference for selecting the magnetic core of the loose coupling transformer of the isolated photovoltaic micro-inverter.
The circuit gain of the single-tube quasi-resonant photovoltaic micro-inverter is not only related to transformer turn ratio, but also related to switching frequency of the inverter. For this reason, design of its transformer can neither follow design methods for traditional single-ended and double-ended high-frequency transformers, nor follow the method for designing two coupled inductors. Therefore, this paper designs a kind of loose coupling transformer suitable for this micro-inverter. It analyzes working principle of the single-tube quasi-resonant photovoltaic micro-inverter, puts forward its equivalent circuit and derives the circuit gain. Then the paper chooses UY typed and EE typed magnetic cores to design parameters of two kinds of loose coupling transformers and uses JMAG finite element software to make simulated analysis of transformer loss and temperature field. Finally, transformer with UY typed core and EE typed core are made for 300 W single-tube quasi-resonant photovoltaic micro-inverter and experimental test. The test result indicates that efficiency of the loose coupling transformer with UY typed core is higher than that of the same kind transformer with EE typed core, which has provided reference for selecting the magnetic core of the loose coupling transformer of the isolated photovoltaic micro-inverter.
引文
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[17] 何国锋,韩耀飞,赵庆玉,等.基于线性自抗扰光伏逆变器的并网电流控制研究[J].可再生能源,2018,36(7):1017-1021.HE Guofeng,HAN Yaofei,ZHAO Qingyu,et al.Grid-connected current control of photovoltaic inverter based on linear active disturbance rejection control[J].Renewable Energy Resources,2018,36(7):1017-1021.
[18] BOUSSELHAM A,ELRAYYAH A.Control and efficient operation of low cost multi PV-based LLC resonantmicroinverters[C]// Photovoltaic Specialists Conference.Portland:[s.n.],2016:3457-3462.
[19] 刘闯,徐鑫哲,刘海洋,等.高频LLC隔离型双降压式光伏逆变器模块研究[J].电力电子技术,2016,50(3):41-44.LIU Chuang,XU Xinzhe,LIU Haiyang,et al.Research on high frequency LLC isolated double buck photovoltaic inverter module[J].Power Electronics,2016,50(3):41-44.
[20] TAMYUREK B,KIRIMER B.An interleaved high-powerflyback inverter for photovoltaic applications[J].IEEE Transactions on Power Electronics,2015,30(6):3228-3241.
[21] 赵永强.单板光伏并网用单管准谐振式变换器的研究[D].青岛:青岛大学,2017.
[22] 刘华斌,王春芳.DC/DC单管谐振式变换器在光伏电热水器中的应用[J].可再生能源,2018,36(11):1625-1630.LIU Huabin,WANG Chunfang.Application of DC/DC single-tube resonant converter in photovoltaic electric water heater[J].Renewable Energy,2018,36(11):1625-1630.
[2] 丛雨,赵永飞,王乐媛,等.基于光伏逆变器无功控制的仿真研究与试验验证[J].内蒙古电力技术,2018,36(4):33-36.CONG Yu,ZHAO Yongfei,WANG Yueyuan,et al.Simulation research and test verification based on reractive power control of photovoltaic inverter[J].Inner Mongolia Electric Power,2018,36(4):33-36.
[3] ANDERSON P M,AGRAWAL B L,VAN NESS J E.Subsynchronous resonance in power system [M].New York:IEEE Press,1990.
[4] ANURAG A ,DESHMUKH N ,MAGULURI A ,et al.Integrated DC-DC converter based grid-connectedtransformerless photovoltaic inverter with extended input voltage range[J].IEEE Transactions on Power Electronics,2018,33(10):8322-8330.
[5] 吴军,程尹曼,程启明,等.一种应用于光伏系统的新型准Z源逆变器调制策略[J].广东电力,2018,31(6):61-67.WU Jun,CHENG Yinman,CHENG Qiming,et al.A new quasi-Z source inverter modulation strategy for photovoltaic systems[J].Guangdong Electric Power,2018,31(6):61-67 .
[6] 周钊正.单管准谐振式微逆变器控制系统的研究[D].青岛:青岛大学,2017.
[7] WU B ,LI S ,SMEDLEY K .A new single-switch isolated high-gain hybrid boosting converter[J].IEEE Transactions on Industrial Electronics,2016,63(8):4978-4988.
[8] CABRAL J B R F,LEMES D S T,VIDAL G O S,et al.A new high gain non-isolated DC-DC boost converter for photovoltaic application[C]// Power Electronics Conference.Piscataway:IEEE Press,2014:569-574.
[9] 殷明,王一军,王海龙,等.基于反激变换器的光伏并网微逆变器设计[J].电力电子技术,2015(3):69-71.YIN Ming,WANG Yijun,WANG Hailong,et al.Design of photovoltaic grid-connected micro-inverter based on flyback converter [J].Power Electronics Technology,2015(3):69-71.
[10] MA C,ZHANG F H.Analysis and improvement on output current quality of active clamped flyback type micro PV inverter[J].Proceedings of the CSEE,2014,34(3):354-362.
[11] HE X F,ZHANG Z L,LI X.An optimal control method for photovoltaic grid-connected interleaved flyback micro-inverters to achieve high efficiency in wide load range[C]//Power Electronics and Motion Control Conference(IPEMC).Harbin:[s.n.],2012:1429-1433.
[12] TAHAVORGAR A,QUAICOE J E.An active-clamping resonant flyback DC/DC converter with improved output power transfer[C]//IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society.Piscataway:IEEE Press,2015:000755-000764.
[13] 夏鲲,丁晓波,袁印,等.低边有源钳位交错反激式微型光伏逆变器设计[J].太阳能学报,2015,36(6):1468-1473.XIA Kun,DING Xiaobo,YUAN Yin,et al.Design of low-side active clamp staggered flyback miniature photovoltaic inverter[J].Journal of Solar Energy,2015,36(6):1468-1473.
[14] 张凤阁,朱仕禄,殷孝雎,等.交错反激式光伏并网微逆变器的控制器实现[J].电工技术学报,2013(5):142-147,153.ZHANG Fengge,ZHU Shilu,YIN Xiaoyu,et al.Controller implementation of staggered flyback photovoltaic grid-connected micro-inverter [J].Journal of Electrical Engineering,2013(5):142-147,153.
[15] BUCCELLA C,CECATI C,LATAFAT H,et al.A grid-connected PV system with LLC resonant DC-DC converter[C]//International Conference on Clean Electrical Power.Alghero:[s.n.],2013:777-782.
[16] 路莲,边敦新,陈羽.基于改进型Heric拓扑的单相无变压器型光伏并网逆变器[J].可再生能源,2018,36(9):1314-1318.LU Lian,BIAN Dunxin,CHEN Yu.A novel single-phase transformerless photovoltaic grid-connected inverter based on improved heric topology[J].Renewable Energy Resources,2018,36(9):1314-1318.
[17] 何国锋,韩耀飞,赵庆玉,等.基于线性自抗扰光伏逆变器的并网电流控制研究[J].可再生能源,2018,36(7):1017-1021.HE Guofeng,HAN Yaofei,ZHAO Qingyu,et al.Grid-connected current control of photovoltaic inverter based on linear active disturbance rejection control[J].Renewable Energy Resources,2018,36(7):1017-1021.
[18] BOUSSELHAM A,ELRAYYAH A.Control and efficient operation of low cost multi PV-based LLC resonantmicroinverters[C]// Photovoltaic Specialists Conference.Portland:[s.n.],2016:3457-3462.
[19] 刘闯,徐鑫哲,刘海洋,等.高频LLC隔离型双降压式光伏逆变器模块研究[J].电力电子技术,2016,50(3):41-44.LIU Chuang,XU Xinzhe,LIU Haiyang,et al.Research on high frequency LLC isolated double buck photovoltaic inverter module[J].Power Electronics,2016,50(3):41-44.
[20] TAMYUREK B,KIRIMER B.An interleaved high-powerflyback inverter for photovoltaic applications[J].IEEE Transactions on Power Electronics,2015,30(6):3228-3241.
[21] 赵永强.单板光伏并网用单管准谐振式变换器的研究[D].青岛:青岛大学,2017.
[22] 刘华斌,王春芳.DC/DC单管谐振式变换器在光伏电热水器中的应用[J].可再生能源,2018,36(11):1625-1630.LIU Huabin,WANG Chunfang.Application of DC/DC single-tube resonant converter in photovoltaic electric water heater[J].Renewable Energy,2018,36(11):1625-1630.