局部阴影遮挡下太阳能电池-超级电容器件阵列建模及其缺失电流协同补偿方法

Modeling of solar cell-supercapacitor device array under local shadow and its cooperative compensation method of missing current

在局部阴影条件下,太阳能电池-超级电容器件(SCSD)阵列中被遮挡器件与未被遮挡器件的功率输出特性不一致,导致SCSD阵列输出功率曲线存在多峰值,需要建立局部阴影遮挡下SCSD阵列的数学模型,并解决局部阴影导致的功率多峰值问题。为此,建立了正常均匀光照、局部轻度阴影遮挡、局部重度阴影遮挡下SCSD阵列的数学模型,详细刻画了不同阴影遮挡条件下SCSD阵列的输出特性;在此基础上,提出了控制SCSD阵列中超级电容充放电以补偿阴影遮挡器件缺失电流的方法。MATLAB仿真和实验室实验结果表明:通过分段函数形式能准确描述局部阴影遮挡下SCSD阵列的数学模型;所提超级电容电流补偿方法不但能使局部阴影遮挡下SCSD阵列的输出功率恢复单峰值,而且有效提高了局部阴影遮挡下SCSD阵列的总输出功率。

Under the local shadow condition,the power output characteristics of occluded devices and unoc⁃cluded devices in the SCSD(Solar Cell-Supercapacitor Device)array are inconsistent,which leads to the existence of multiple peak values in the output power curve of SCSD array.It is necessary to establish a mathematical model of SCSD array under local shadow and solve the problem of multiple power peaks caused by local shadow.Therefore,the mathematical models of SCSD array under normal uniform illumina⁃tion,local light shadow and local severe shadow are established,and the output characteristics of SCSD array under different shadow conditions are described in detail.On this basis,a method is proposed to control the charging and discharging of supercapacitor in SCSD array to compensate the missing current of occluded devices.MATLAB simulative results and laboratory experimental results show that the mathematical model of SCSD array under local shadow can be accurately described by piecewise function.The proposed super⁃capacitor current compensation method can not only restore the output power of SCSD array under local shadow to single peak value,but also effectively improve the total output power of SCSD array.