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中文摘要：
提出了光伏电池在无遮挡以及部分遮挡2种情况下光伏电站的等效建模方法。首先根据光伏电池的外特性进行聚合,获得等效光伏电池的外特性;分析了当光伏电池部分遮挡时,等效光伏组件的最大功率点出现漂移,此时根据光伏电池聚合获得的等效光伏单元的功率大于实际值。为获得光伏电池部分遮挡情况下光伏电站的等效模型,根据光伏电站PCC点处测量得到的功率、电压以及实际环境信息,以理想光伏电池外特性作为拟合函数,进而辨识光伏阵列的并联数目。算例结果表明,该方法兼具较高的稳态与动态精度,适用于光伏电池型号不同或部分遮挡下的光伏电站等效建模。
英文摘要：
Two equivalent modeling methods of the photovoltaic （PV） power station under two circumstances, namely the PV cell is partially shielded or not shielded, are proposed. Firstly, the I-V characteristics of the PV cell are aggregated to obtain the I-V characteristic of the equivalent PV module; secondly, when the PV module is partially shielded, the maximum power point of the equivalent PV module drifts, in the meanwhile the power output of the PV module according to the aggregation of the power cell is greater than its practical value. To achieve the equivalent model of PV power station under PV cell partial shielded, based on the active power and the voltage measured at the point of common coupling （PCC） and actual environmental information such as illumination and temperature and taking the external characteristic of ideal PV cell as the fitting function, the number of the parallel PV modules can be identified. Results of calculation example show that the proposed method possesses both higher steady accuracy and dynamic accuracy, so it is suitable for the equivalent modeling of PV modules composed of different types of PV cells or the equivalent modeling of partially shielded PV power station.
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