阴影下不同光伏阵列结构输出性能对比与分析
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摘要
光伏阵列的输出功率不仅取决于阴影处辐照度的强弱,还与阴影形状有关。针对传统SP(Series-parallel)结构、TCT(Total-Cross-Tied)结构在某些阴影情况下功率损失较严重的问题,提出了一种优化的TCT结构。在严重遮挡和辐照不均匀两种情况下,设置了5种阴影模式,对比分析了3种结构的输出能力。采用Matlab/Simulink软件,仿真了不同的阴影形状,以及对称阵列和不对称阵列下3种结构的输出性能,仿真结果表明:优化TCT结构能更好的适应不同的阴影情况,为光伏电站建设时阵列结构的选择提供了参考。
The output power of PV array not only depends on the irradiance intensity of the partial shadows, but also on the shadows shape. For the serious power loss under partial shadows of the traditional SP(Series-Parallel) and TCT(Total-Cross-Tied) structures, an optimized TCT structure is proposed. Output capacity comparison was made based on the three structures in five shadow modes under the circumstances of the severe shadows and uneven irradiation. By using Matlab/Simulink software, the output performance of the three structures was simulated under different shadow shapes in symmetrical and asymmetric arrays. The results show that PV array with the optimized TCT structure works better in the different shadow conditions, which can provide selection references for the array structure in the construction of photovoltaic plants.
The output power of PV array not only depends on the irradiance intensity of the partial shadows, but also on the shadows shape. For the serious power loss under partial shadows of the traditional SP(Series-Parallel) and TCT(Total-Cross-Tied) structures, an optimized TCT structure is proposed. Output capacity comparison was made based on the three structures in five shadow modes under the circumstances of the severe shadows and uneven irradiation. By using Matlab/Simulink software, the output performance of the three structures was simulated under different shadow shapes in symmetrical and asymmetric arrays. The results show that PV array with the optimized TCT structure works better in the different shadow conditions, which can provide selection references for the array structure in the construction of photovoltaic plants.
引文
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[2]PICAULT D,RAISON B,BACHA S,et al.Changing photovoltaic array interconnections to reduce mismatch losses:a case study[C]//International Conference on Environment and Electrical Engineering,2010:37-40.
[3]丁坤,王祥,徐俊伟,等.常见光伏阵列拓扑结构分析[J].电网与清洁能源,2014,30(3):114-118.Ding Kun,Wang Xiang,Xu Junwei,et al.Topological Analysis of Common PV Arrays[J].Power System and Clean Energy,2014,30(3):114-118.
[4]Cheng Ze,Pang Zhichao,Liu Yanli,et al.An adaptive solar photovoltaic array reconfiguration method based on fuzzy Control[C]//Proceedings of the 8th WCICA,2010:176-181.
[5]李锐华,闫宇星,胡波.阴影遮蔽条件下光伏阵列的可重构优化配置方法[J].电网与清洁能源,2014,30(7):38-44.Li Ruihua,Yan Yuxing,Hu bo.Reconfigurable optimization arrangement method of photovoltaic arrays in partial shade condition[J].Power System and Clean Energy,2014,30(7):38-44.
[6]孙自勇,宇航,严干贵,等.基于PSCAD的光伏阵列和MPPT控制器的仿真模型[J].电力系统保护与控制,2009,37(19):61-64.Sun Ziyong,Yu hang,Yan Gangui,et al.PSCADsimulation models for photovoltaic array and MPPTcontroller[J].Power System Protection and Control,2009,37(19):61-64.
[7]Rani B I,Ilango G S,Nagamani C.Enhanced power generation from PV array under partial shading conditions by shade dispersion using Su Do Ku configuration[J].IEEE Trans.Sustain Energy(S1949-3029),2013,4(3):594-601.
[8]Sahu H S,Nayak S K.Extraction of maximum power from a PV array under nonuniform irradiation condition,IEEE Transactions on Electron Devices(S0018-9383),2016,63(12):4825-4831.
[9]Sahu H S,Nayak S K.Power enhancement of partially shaded PV array by using a novel approach for shade dispersion[C]//Innovative smart grid technologies Asia(ISGT Asia),2014:498-503.
[10]蒋建东,花京东,李鲁霞.分布式光伏阵列重构拓扑及控制方法[J].机电工程,2013,30(3):343-348.Jiang Jiandong,Hua Jinghua,Li Luxia.Reconfigure topology and control strategy of distribute photovoltaic array[J].Journal of Mechanical&Electrical Engineering,2013,30(3):343-348.