Maximum power point tracking control for grid-connected photovoltaic system under partial shading conditions

Abstract EN

This manuscript uses an active bypass circuit to preserve the photovoltaic (PV) modules from a significant reduction in power generation, which is transferring from partial shading.

The active bypass circuit controls each PV module separately, including the shaded ones, by detecting the shaded region on these modules using an image processing technique.

The active bypass circuit ensures that every PV module on the solar system is working at its maximum power operating point.

Under partial shading conditions, the conventional maximum power point tracking (MPPT) methods have usually failed to track the global MPP.

In order to overcome this limitation, this paper attempts to combine a fuzzy logic technique and an active bypass circuit to ensure the detection of a unique global power point (GMPP).

A current source inverter (CSI) is used with a double-tuned resonant filter to eliminate the undesirable harmonics on the direct current (DC) side.

In addition, an LC filter is used in the AC side to reduce the switching harmonics.

The simulation results demonstrate improvement in the performance of the proposed MPPT method under partial shading conditions.

Hence, the combination of the active bypass circuit and the image processing technique, based on a fuzzy logic decision-making approach, provides an effective process for the detection of the shaded region on the surface of the PV module.

In addition, this combination ensures a unique global maximum power point (GMPP)for the proposed PV solar system.