摘要
针对局部阴影遮挡下太阳能电池最大输出功率降低,进一步导致光伏阵列行电流不均衡,功率-电压(P-U)输出特性曲线产生多峰值等问题,提出了太阳能电池-超级电容(solar cell-supercapacitor,SCS)一体化阵列方案,由SCS器件、动态重构拓扑与常规光伏阵列相连接组成。基于SCS器件的超级电容充/放电特性,提出行电压闭环控制策略,根据光伏阵列行电压与最大功率点电压的偏差,以一体化阵列输出功率最大为控制目标,以开关矩阵连接方式为决策变量,调整SCS器件与光伏阵列连接方式,均衡光伏阵列各行电流,实现SCS器件对阴影遮挡电池进行功率补偿。搭建9×9的SCS一体化阵列仿真模型,对比分析4种典型动态云层阴影遮挡模式下,全交叉型(total-cross-tied,TCT)、静态阵列重构技术、动态阵列重构技术、SCS一体化阵列的输出特性。结果表明:SCS一体化阵列填充因子达77.4%,功率损耗约18W,优于其他3种方案。SCS一体化方案有效提高了局部阴影遮挡下光伏阵列的输出功率。
The maximum output power of solar cells may reduce under partial shading conditions,which further leads to uneven current in the photovoltaic(PV)array and multiple peaks in the power/voltage output characteristic curve,therefore,we proposed.a scheme of an integrated array of a solar cell+supercapacitor(SCS)device by dynamically reconfiguring the topology and connecting it to a conventional PV array.We adopted a row voltage closed-loop control strategy on the basis of the supercapacitor charging and discharging characteristics of the SCS device.According to the deviation between the row voltage of the PV array and the maximum power point voltage,the control objective is to maximize the output power of the integrated array,and the switch matrix is used as the decision variable.The connection method between SCS devices and the PV array is adjusted to balance the current in each row of the PV array,and to achieve power compensation for shadow covered cells by SCS devices.The 9×9 SCS integrated array were built,and the output characteristics of TCT,static array reconfiguration,dynamic array reconfiguration,and SCS integrated arrays were compared and analyzed under four typical dynamic cloud shading conditions.The results show that the filling factor of the SCS integrated array reaches 77.4%,and the power loss is about 18 W,which is better than the that of other three schemes.The SCS integration array effectively improves the output power of PV arrays under partial shadow conditions.
作者
杨洪明
刘璐雨
段献忠
Archie James Johnston
杨洪朝
YANG Hongming;LIU Luyu;DUAN Xianzhong;Archie James Johnston;YANG Hongzhao(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;College of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;School of Software,Changsha Social Work College,Changsha 410004,China)
出处
《高电压技术》
北大核心
2025年第7期3455-3465,I0002,I0003,共13页
High Voltage Engineering
基金
国家自然科学基金(72061147004,72342001,72371037,7217010719,72171026)
湖南省科技计划(2025JJ10009,2022RC4025,2023JJ50312,2023JJ50010,2024RC9012)。
关键词
局部阴影遮挡
太阳能电池-超级电容一体化阵列
动态重构
行电压闭环控制
功率补偿
行电流均衡
partial shading conditions
SCS integrated array
dynamic array reconfiguration
row voltage feedback closed-loop control
power compensation
row current balance
