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

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.     

Stability-Controllable Second-Order Difference Scheme for Convection Term

INTanDUCTIONIntherealmofcomputati0na1fluiddynamicsandconvectiveheattransfer,false-diffusionandconvec-tiveinstabilityarethemajorobstaclestotheachieve-melltofaccurateandeconomicalsoluti0nt0thegov-erningequations.Theconvectiveinstabilityisassrvciatedwiththepresenceofalargeconvectiontermintheequationandischaracterizedbyanoscilla-tionofthesolutionfromnodet0n.de[1'2].Thisin-stabilitydiffersfromtheinstabilitycausedbylargetimestepintransientsystem(instabilityofinitialproblem),andmaybeencountereddu…