基于软开关的光伏单组串MPPT集散电源及其控制
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摘要
为了解决集散式光伏发电系统光伏组串间匹配和光照差异等引起输出功率下降的问题,文章提出一种对每支光伏组串进行MPPT控制的单组串MPPT集散电源系统方案,实现了光伏电站发电量的最大化;针对功率转换电路,提出一种新型软开关升压变换电路拓扑,不仅能提高系统转换效率、减小设备尺寸,而且还消除了既有软开关电路拓扑在开关时序受干扰时易烧损的隐患,提高了转换电路的可靠性;结合系统多路MPPT多转换模块的特点,提出一种载波交错同步的控制策略及其实现方法,以最大限度地抑制输出电流纹波,节省滤波器成本。通过对所试制集散电源装置进行实验,结果验证了该方案的有效性。
It proposed a system solution of single string MPPT converter for D&C(central distributed) PV system to solve PV strings matching problem. A ZVS soft-switching boost converter topology was proposed to improve the system conversion efficiency and reduce the device size. In addition, it eliminates the damage risk of existing soft-switching circuit topology when the switching timing is disturbed and improves the reliability of the converter. In order to suppress output current ripple and save the cost of the filter, it introduced a carrier phase interleaving synchronization strategy for power converter modules. The validity of the proposed schemes were confirmed by experimental results of prototype.
It proposed a system solution of single string MPPT converter for D&C(central distributed) PV system to solve PV strings matching problem. A ZVS soft-switching boost converter topology was proposed to improve the system conversion efficiency and reduce the device size. In addition, it eliminates the damage risk of existing soft-switching circuit topology when the switching timing is disturbed and improves the reliability of the converter. In order to suppress output current ripple and save the cost of the filter, it introduced a carrier phase interleaving synchronization strategy for power converter modules. The validity of the proposed schemes were confirmed by experimental results of prototype.
引文
[1]刘刚,梁燕,汪海涛,等.MW级光伏发电系统并网技术方案研究[J].电源世界,2016(1):41-45.LIU G,LIANG Y,WANG H T,et al.Research on Grid-connected Technology of MW Level Photovoltaic Power Generation System[J].The World of Power Supply,2016(1):41-45.
[2]蹇芳,李志勇.光伏逆变器技术现状与发展[J].大功率变流技术,2014(3):5-9.JIAN F,LI Z Y.Technology Status and Future Development of PV Inverter[J].High Power Converter Technology,2014(3):5-9.
[3]邓宇.集散式逆变器应用及设计方案探讨[J].中国设备工程,2017(6):82-83.DENG Y.Research on Application of D&C Inverter and Design scheme[J].Chinese Device Engineering,2017(6):82-83.
[4]唐秋文.集散式逆变器特性及应用初探[J].石化技术,2016(11):273.TANG Q W.Research on the Property of D&C Inverter and Application[J].Petrochemical Industry Technology,2016(11):273.
[5]王正仕,方红兴,徐德鸿.辅助管实现无损吸收的零电压转移BOOST电路[J].电力电子技术,2000,34(4):4-6.WANG Z S,FANG H X,XU D H.Realization of Lossless Snubber for Auxiliary Switching in ZVT-BOOST Circuit[J].Power Electronics,2000,34(4):4-6.
[6]叶欣,蔡拥军.一种新颖的有源钳位ZVS-Boost变换器[J].电源技术应用,2005,8(6):12-16.YE X,CAI Y J.A Novel Zero Voltage Switching Boost Converter with Active Clamping[J].Power Supply Technologies and Applications,2005,8(6):12-16.
[7]褚恩辉,叶树仁,王遨宇.一种新型的有源软开关变换器[J].电机与控制学报,2011,15(5):72-77.CHU E H,YE S R,WANG A Y.A novel active soft switching converter[J].Electric Machines and Control,2011,15(5):72-77.
[8]孟建辉,付超,石新春,等.光伏逆变系统中的ZVS升压变换器[J].电机与控制学报,2013,17(11):1-7.MENG J H,FU C,SHI X C,et al.ZVS boost converter of photovoltaic inverter system[J].Electric Machines and Control,2013,17(11):1-7.
[9]孟建辉,石新春,付超,等.新型高效率两级式单相光伏并网逆变系统的研究与应用[J].电力系统保护与控制,2013,41(20):87-92.MENG J H,SHI X C,FU C,et al.Research and application of novel high efficiency two-stage single-phase photovoltaic grid-connected inverter system[J].Power System Protection and Control,2013,41(20):87-92.
[10]TSENG C J,CHEN C L.Novel ZVT-PWM converters with active snubbers[J].IEEE Transactions on Power Electronics,1998,13(5):861-869.
[11]张矛盾,张淼,孙兴中,等.新型Boost ZVT-PWM变换器在光伏系统中的应用[J].电力电子技术,2010,44(4):12-14.ZHANG M D,ZHANG M,SUN X Z,et al.A new Boost ZVTPWM converter and its application in photovoltaic system[J].Power Electronics,2010,44(4):12-14.
[2]蹇芳,李志勇.光伏逆变器技术现状与发展[J].大功率变流技术,2014(3):5-9.JIAN F,LI Z Y.Technology Status and Future Development of PV Inverter[J].High Power Converter Technology,2014(3):5-9.
[3]邓宇.集散式逆变器应用及设计方案探讨[J].中国设备工程,2017(6):82-83.DENG Y.Research on Application of D&C Inverter and Design scheme[J].Chinese Device Engineering,2017(6):82-83.
[4]唐秋文.集散式逆变器特性及应用初探[J].石化技术,2016(11):273.TANG Q W.Research on the Property of D&C Inverter and Application[J].Petrochemical Industry Technology,2016(11):273.
[5]王正仕,方红兴,徐德鸿.辅助管实现无损吸收的零电压转移BOOST电路[J].电力电子技术,2000,34(4):4-6.WANG Z S,FANG H X,XU D H.Realization of Lossless Snubber for Auxiliary Switching in ZVT-BOOST Circuit[J].Power Electronics,2000,34(4):4-6.
[6]叶欣,蔡拥军.一种新颖的有源钳位ZVS-Boost变换器[J].电源技术应用,2005,8(6):12-16.YE X,CAI Y J.A Novel Zero Voltage Switching Boost Converter with Active Clamping[J].Power Supply Technologies and Applications,2005,8(6):12-16.
[7]褚恩辉,叶树仁,王遨宇.一种新型的有源软开关变换器[J].电机与控制学报,2011,15(5):72-77.CHU E H,YE S R,WANG A Y.A novel active soft switching converter[J].Electric Machines and Control,2011,15(5):72-77.
[8]孟建辉,付超,石新春,等.光伏逆变系统中的ZVS升压变换器[J].电机与控制学报,2013,17(11):1-7.MENG J H,FU C,SHI X C,et al.ZVS boost converter of photovoltaic inverter system[J].Electric Machines and Control,2013,17(11):1-7.
[9]孟建辉,石新春,付超,等.新型高效率两级式单相光伏并网逆变系统的研究与应用[J].电力系统保护与控制,2013,41(20):87-92.MENG J H,SHI X C,FU C,et al.Research and application of novel high efficiency two-stage single-phase photovoltaic grid-connected inverter system[J].Power System Protection and Control,2013,41(20):87-92.
[10]TSENG C J,CHEN C L.Novel ZVT-PWM converters with active snubbers[J].IEEE Transactions on Power Electronics,1998,13(5):861-869.
[11]张矛盾,张淼,孙兴中,等.新型Boost ZVT-PWM变换器在光伏系统中的应用[J].电力电子技术,2010,44(4):12-14.ZHANG M D,ZHANG M,SUN X Z,et al.A new Boost ZVTPWM converter and its application in photovoltaic system[J].Power Electronics,2010,44(4):12-14.