Single-Phase, Grid-Connected PV Inverter with Partial Shading (Equation-Based PV Cell, P&O and dP/dV MPPT)

This PLECS demo model illustrates a grid-connected solar panel system with a boosted front end and a single-phase inverter back end. The boost converter is designed to operate the panel at its maximum power point (MPP). A maximum power point tracking (MPPT) algorithm is implemented to improve the performance of the solar panel under partial shading conditions. Further, the inverter is operated with an outer voltage loop to control the DC-link voltage and a synchronous regulator to maintain unity power factor.

Three-Phase, Grid-Connected PV Inverter

Three-phase PV inverters are generally used for off-grid industrial use or can be designed to produce utility frequency AC for connection to the electrical grid. This PLECS application example model demonstrates a three-phase grid-connected solar inverter. The PV system includes an accurate PV string model and the strings can be series-parallel connected to scale to a desired array output power. The simulation combines the electrical power circuit, the DC/DC and DC/AC control schemes, and the thermal behavior of the semiconductors.

Photovoltaic String Model

PV modules are often connected in series strings to increase the DC input voltage for a PV inverter. In this example, a PV string comprising an arbitrary number of series-connected modules is modeled. The PV string model is based on a non-linear current source that accurately models the non-linear VI characteristic.