基于逆变器过载损失的双面组件光伏电站最优容配比分析

ANALYSIS OF OPTIMAL PV/INVERTER RATIO OF BIFACIAL PV MODULES PV POWER STATION BASED ON INVERTER OVERLOAD LOSS

以某个实际采用双面光伏组件的光伏电站(下文简称为“双面组件光伏电站”)为例,本文对比了不同容配比下双面组件光伏电站中逆变器的实际过载损失和模拟过载损失,结果发现:逆变器的模拟过载损失比其实际过载损失小,这会导致通过模拟光伏电站发电量得到的光伏电站最优容配比与实际情况存在偏差。因此,通过采用最小二乘法多项式曲线拟合和数据映射法,利用不同容配比下双面组件光伏电站的实际发电量损失数据校正模拟得到的发电量损失数据,并由此得到符合实际情况的双面组件光伏电站发电量推算值,最终通过校正后的发电量推算值获得与实际情况相符的双面组件光伏电站的最优容配比。

Taking an actual PV power station which adopts bifacial PV modules(hereinafter referred to as“bifacial modules PV power station”)as an example,this paper compares the actual overload loss and simulated overload loss of the inverter in this bifacial modules PV power station under different PV/inverter ratios.It is found that the simulated overload loss of the inverter is smaller than the actual overload loss.This will lead to deviation between the optimal PV/inverter ratio of the PV power station obtained by simulating the power generation and the actual situation.Therefore,through the use of least squares polynomial curve fitting and data mapping method,the actual power generation loss data of bifacial modules PV power station under different PV/inverter ratios are used to correct the simulated power generation loss data.And from this,the estimated value of power generation of bifacial modules PV power station that meet the actual situation can be obtained.Finally,the optimal PV/inverter ratio of the bifacial modules PV power station that is consistent with the actual situation is obtained through the corrected estimated value of power generation.