The simulation circuit of PV arrays can be complex or even features low accuracy, due to the series or parallel connection of photovoltaic cells that are usually modeled by conventional models. In this paper, the PV arrays modeling methods are divided into two categories, namely, calculation method and look-up table method. The calculation method easily falls into convergence, yet needs definite PV output voltage and current equation. The look-up table method is more flexible as the modeling of PV array only requires current and voltage data. A look-up table method is proposed to verify the correctness of modeling PV arrays in a solar power converter. In this process, a few key problems are solved. According to the proposed model and the impedance analysis results, the mechanisms of distributed maximum power point tracking (MPPT) of single, series, and multiple PV arrays are investigated and the corresponding equations are obtained. Calculation cases of corresponding configurations are simulated and the results are compared with that of centralized MPPT, which provides solid theoretical foundations for improving the efficiency of PV arrays.