光伏电池不一致性检测及其应用

Inconsistency Detection of Photovoltaic Cells and Its Applications

针对光伏阵列中光伏电池伏安特性差异大的问题,提出一种采用分段线性插值与最小二乘法相结合的光伏电池单体及组件不一致性检测方法。与传统光伏电池最大功率检测法相比,该方法对伏安特性一致性有更好的检测效果。该文先通过Matlab仿真验证了该检测方法的有效性,再通过滞环电流控制法搭建了2 kW光伏并网发电平台,并将2种方法分别在该平台上进行了对比验证。实验测试结果表明,分段线性插值与最小二乘法相结合的不一致性检测法较最大功率分类法更为准确有效。对光伏阵列串并联系统中光伏电池组件的选取具有实用价值。

For the inconsistency of photovoltaic （PV） cells in the photovoltaic array, a novel method of the PV inconsistency detection was proposed in this paper. The piecewise linear interpolation method and the least squares method are combined to calculate the inconsistency of PVs in the proposed method. Compared with the traditional maximum power distinguish method, the proposed method enhances the detect effects. Firstly, simulation results prove its validation. Secondly, a PV grid-connected generation system was built, where the hysteresis current control method was used to control grid currents. The proposed method and the traditional method are verified separately and compared in the PV generation system. The experiment results prove the proposed method of the piecewise linear interpolation method and least squares has better effects and accuracy than the maximum power distinguish method. The method possesses the practical value for the selection of the PV cells in the PV series-and-parallel system.