Large-signal analysis based on nonlinear algebraic equations for an integrated photovoltaic module-converter system

摘要

Photovoltaic (PV) systems show nonlinear current-voltage characteristics that depend on both the temperature and the level of solar radiation. Impedance matching is required to achieve the optimal power transfer from such nonlinear PV systems under various temperatures and solar intensities. An efficient analysis method is proposed herein to obtain the characteristics of the PV panel and to simulate the whole system consisting of a PV panel and a converter. The aim is to enable large-signal analysis of an integrated photovoltaic module-converter system based on impedance matching. The Newton-Raphson method is used to obtain the solution of the nonlinear system of equations corresponding to a discrete equivalent circuit model. Various characteristics of the PV system and the simulation results for the whole system are obtained from the resulting linearized model.