一种多输入变换器在光伏DMPPT中的应用
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摘要
为了解决光伏系统中由于在实际环境中光照不均、阴影遮挡、光伏板老化程度差异等因素导致的失配问题,采用分布式最大功率跟踪DMPPT(distributed maximum power point tracking)结构是有效方法之一。针对光伏DMPPT结构提出了一种基于差额功率结构的多输入变换器拓扑及分时控制策略。该拓扑及控制策略不仅只用1个MPPT控制单元就可完全消除光伏板间的失配问题、使各个光伏板输出其理想最大功率,而且变换器拓扑采用差额功率结构,该结构具有降低变换器的功率等级要求和提高系统的电压增益等优点。对该拓扑及控制策略进行了详细分析,并在Matlab/Simulink中仿真验证。仿真结果表明,即使在光照不均及光照突变的情况下,每个光伏板仍都可以工作在各自理想最大功率点上。
To solve the mismatch problem with a photovoltaic(PV) system caused by uneven illumination, shadow masking and aging of PV panels in the practical environment, the structure of distributed maximum power point tracking(DMPPT) is one of the efficient methods. In this paper, a multi-input converter topology based on differential power structure along with a time-sharing control strategy is proposed for the structure of PV DMPPT. On one hand, this topology and control strategy can completely eliminate the mismatch problem between PV panels with only one MPPT control unit, so that each PV panel outputs its ideal maximum power; on the other hand, this converter topology adopts a differential power structure, which has advantages such as reducing the power level requirements of the converter and improving the system voltage gain. The topology and control strategy are analyzed in detail, which are verified through simulations in MATLAB/Simulink. Simulation results show that each PV panel can still operate at its individual ideal maximum power point even under uneven illumination condition as well as with sudden illumination change.
To solve the mismatch problem with a photovoltaic(PV) system caused by uneven illumination, shadow masking and aging of PV panels in the practical environment, the structure of distributed maximum power point tracking(DMPPT) is one of the efficient methods. In this paper, a multi-input converter topology based on differential power structure along with a time-sharing control strategy is proposed for the structure of PV DMPPT. On one hand, this topology and control strategy can completely eliminate the mismatch problem between PV panels with only one MPPT control unit, so that each PV panel outputs its ideal maximum power; on the other hand, this converter topology adopts a differential power structure, which has advantages such as reducing the power level requirements of the converter and improving the system voltage gain. The topology and control strategy are analyzed in detail, which are verified through simulations in MATLAB/Simulink. Simulation results show that each PV panel can still operate at its individual ideal maximum power point even under uneven illumination condition as well as with sudden illumination change.
引文
[1]马昊,张庆超.基于粒子群优化算法和变步长扰动观察法的局部阴影情况下MPPT控制[J].电源学报,2016,14(3):94-101.Ma Hao,Zhang Qingchao.MPPT control under partial shading condition based on PSO and variable step size P&O[J].Journal of Power Supply,2016,14(3):94-101(in Chinese).
[2]邵伟明,程树英,林培杰,等.局部阴影下光伏阵列MPPT算法及实现[J].电源学报,2016,14(1):27-34,42.Shao Weiming,Chen Shuying,Lin Peijie,et al.MPPT algorithm and realization for photovoltaic array under partial shadow[J].Journal of Power Supply,2016,14(1):27-34,42(in Chinese).
[3]张杨俊,龙江涛,聂金铜,等.混合储能独立光伏系统MPPT策略研究[J].电源学报,2013,11(3):87-90.Zhang Yangjun,Long Jiangtao,Nie Jintong,et al.Research on MPPT strategy for stand-alone photovoltaic system based on hybrid energy storage[J].Journal of Power Supply,2013,11(3):87-90(in Chinese).
[4]赵志.一种新的光伏系统最大功率跟踪控制方法[J].电源学报,2015,13(3):119-125.Zhao Zhi.A new maximum power point tracking control method of photovoltaic power system[J].Journal of Power Supply,2015,13(3):119-125(in Chinese).
[5]徐晓淳,刘春生,李锋.光伏系统MPPT的改进模糊控制[J].电力系统及其自动化学报,2014,26(9):81-84.Xu Xiaochun,Liu Chunsheng,Li Feng.Improved fuzzy control on MPPT method of solar system[J].Proceedings of the CSU-EPSA,2014,26(9):81-84(in Chinese).
[6]Feng Han,Hou Meiyi,Liu Shiling,et al.Analysis of the photovoltaic cells output power based on the door-connection under mismatch[C]//2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference.Brisbane,QLD,Australia,2015:1-4.
[7]Galtieri J,Krein P T.Energy improvements from subpanel DC-DC converters in PV arrays with distributed mismatch[C]//2016 IEEE 43rd Photovoltaic Specialists Conference(PVSC).Portland,OR,USA,2016:3213-3218.
[8]Orozco-Gutierrez M L,Ramirez-Scarpetta J M,Spagnuolo G,et al.Fast estimation of MPPs in mismatched PV arrays based on lossless model[C]//2015 International Conference on Clean Electrical Power(ICCEP).Taormina,Italy,2015:435-440.
[9]Wang Feng,Zhu Tianhua,Zhuo Fang,et al.Analysis and optimization of flexible MCPT strategy in submodule PV application[J].IEEE Transactions on Sustainable Energy,2017,8(1):249-257.
[10]Sajadian S,Ahmadi R.Distributed maximum power point tracking using model predictive control for solar photovoltaic applications[C]//2017 IEEE Applied Power Electronics Conference and Exposition(APEC).Tampa,FL,US-A,2017:1319-1325.
[11]Luo Hengyang,Wen Huiqing,Li Xingshuo.Distributed MP-PT control under partial shading condition[C]//2016 IEEE 8th International Power Electronics and Motion Control Conference.Hefei,China,2016:928-932.
[12]Zhu Tianhua,Wang Feng,Shi Shuhuai,et al.Optimization of time-sharing output maximum current tracking(MCT)strategy in subpanel level distributed maximum power point tracking(DMPPT)application[C]//2016 IEEE 8th International Power Electronics and Motion Control Conference.Hefei,China,2016:3435-3440.
[13]Wang Feng,Wu Xinke,Lee F C,et al.Analysis of unified output MPPT control in subpanel PV converter system[J].IEEE Transactions on Power Electronics,2013,29(3):1275-1284.
[14]Deline C,Marion B.A performance and economic analysis of distributed power electronics in photovoltaic systems[R/OL].National Renewable Energy Laboratory,2011.1.http://www.nrel.gov/docs/fy11osti/50003.pdf.
[15]Wang Feng,Zhu Tianhua,Zhuo Fang,et al.Analysis and comparison of FPP and DPP structure based DMPPT PVsystem[C].//2016 IEEE 8th International Power Electronics and Motion Control Conference.IEEE,2016:207-211.
[16]Walker G R,Sernia P C.Cascaded DC-DC converter connection of photovoltaic modules[J].IEEE Transactions on Power Electronics,2004,19(4):1130-1139.
[17]Zhou Huimin,Zhao Junjian,Han Yehui.PV balancers:Concept,architectures,and realization[J].IEEE Transactions on Power Electronics,2012,30(7):3479-3487.
[18]Shenoy P S,Kim K A,Johnson B B,et al.Differential power processing for increased energy production and reliability of photovoltaic systems[J].IEEE Transactions on Power Electronics,2013,28(6):2968-2979.
[2]邵伟明,程树英,林培杰,等.局部阴影下光伏阵列MPPT算法及实现[J].电源学报,2016,14(1):27-34,42.Shao Weiming,Chen Shuying,Lin Peijie,et al.MPPT algorithm and realization for photovoltaic array under partial shadow[J].Journal of Power Supply,2016,14(1):27-34,42(in Chinese).
[3]张杨俊,龙江涛,聂金铜,等.混合储能独立光伏系统MPPT策略研究[J].电源学报,2013,11(3):87-90.Zhang Yangjun,Long Jiangtao,Nie Jintong,et al.Research on MPPT strategy for stand-alone photovoltaic system based on hybrid energy storage[J].Journal of Power Supply,2013,11(3):87-90(in Chinese).
[4]赵志.一种新的光伏系统最大功率跟踪控制方法[J].电源学报,2015,13(3):119-125.Zhao Zhi.A new maximum power point tracking control method of photovoltaic power system[J].Journal of Power Supply,2015,13(3):119-125(in Chinese).
[5]徐晓淳,刘春生,李锋.光伏系统MPPT的改进模糊控制[J].电力系统及其自动化学报,2014,26(9):81-84.Xu Xiaochun,Liu Chunsheng,Li Feng.Improved fuzzy control on MPPT method of solar system[J].Proceedings of the CSU-EPSA,2014,26(9):81-84(in Chinese).
[6]Feng Han,Hou Meiyi,Liu Shiling,et al.Analysis of the photovoltaic cells output power based on the door-connection under mismatch[C]//2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference.Brisbane,QLD,Australia,2015:1-4.
[7]Galtieri J,Krein P T.Energy improvements from subpanel DC-DC converters in PV arrays with distributed mismatch[C]//2016 IEEE 43rd Photovoltaic Specialists Conference(PVSC).Portland,OR,USA,2016:3213-3218.
[8]Orozco-Gutierrez M L,Ramirez-Scarpetta J M,Spagnuolo G,et al.Fast estimation of MPPs in mismatched PV arrays based on lossless model[C]//2015 International Conference on Clean Electrical Power(ICCEP).Taormina,Italy,2015:435-440.
[9]Wang Feng,Zhu Tianhua,Zhuo Fang,et al.Analysis and optimization of flexible MCPT strategy in submodule PV application[J].IEEE Transactions on Sustainable Energy,2017,8(1):249-257.
[10]Sajadian S,Ahmadi R.Distributed maximum power point tracking using model predictive control for solar photovoltaic applications[C]//2017 IEEE Applied Power Electronics Conference and Exposition(APEC).Tampa,FL,US-A,2017:1319-1325.
[11]Luo Hengyang,Wen Huiqing,Li Xingshuo.Distributed MP-PT control under partial shading condition[C]//2016 IEEE 8th International Power Electronics and Motion Control Conference.Hefei,China,2016:928-932.
[12]Zhu Tianhua,Wang Feng,Shi Shuhuai,et al.Optimization of time-sharing output maximum current tracking(MCT)strategy in subpanel level distributed maximum power point tracking(DMPPT)application[C]//2016 IEEE 8th International Power Electronics and Motion Control Conference.Hefei,China,2016:3435-3440.
[13]Wang Feng,Wu Xinke,Lee F C,et al.Analysis of unified output MPPT control in subpanel PV converter system[J].IEEE Transactions on Power Electronics,2013,29(3):1275-1284.
[14]Deline C,Marion B.A performance and economic analysis of distributed power electronics in photovoltaic systems[R/OL].National Renewable Energy Laboratory,2011.1.http://www.nrel.gov/docs/fy11osti/50003.pdf.
[15]Wang Feng,Zhu Tianhua,Zhuo Fang,et al.Analysis and comparison of FPP and DPP structure based DMPPT PVsystem[C].//2016 IEEE 8th International Power Electronics and Motion Control Conference.IEEE,2016:207-211.
[16]Walker G R,Sernia P C.Cascaded DC-DC converter connection of photovoltaic modules[J].IEEE Transactions on Power Electronics,2004,19(4):1130-1139.
[17]Zhou Huimin,Zhao Junjian,Han Yehui.PV balancers:Concept,architectures,and realization[J].IEEE Transactions on Power Electronics,2012,30(7):3479-3487.
[18]Shenoy P S,Kim K A,Johnson B B,et al.Differential power processing for increased energy production and reliability of photovoltaic systems[J].IEEE Transactions on Power Electronics,2013,28(6):2968-2979.