Abstract
This paper proposes a Low-Voltage Ride-Through control strategy for a three-phase grid-connected photovoltaic (PV) system. At two stages, the topology is considered for the grid-tied system fed by a photovoltaic generator with a boost converter followed by a three-phase voltage source inverter. A flexible control strategy is built for the proposed system. It accomplishes the PV converter operations under the normal operating mode and under grid faults (symmetrical and asymmetrical grid voltage sag). The boost converter is controlled via an incremental conductance maximum power point tracking technique to maximize the PV generator power extraction. In the case of voltage sag, the implemented control strategy provides a switch between MPPT mode and non-MPPT mode to ensure the protection of the power converters. Theoretical modeling and simulation studies were performed, and significant results are extracted and presented to prove the effectiveness of the proposed control algorithm.
Highlights
In recent years, the world is approaching an energy crisis and environmental issues such as global warming and pollution, which direct research interest toward the improvement of renewable energy, such as photovoltaic systems, wind turbine, biomass energy, fuel cells, etc.The generation of photovoltaic renewable energy is the most attractive because of its high availability, the simplicity of the topology, and low cost compared to other resources of renewable energy
In the case of voltage sag, the implemented control strategy provides a switch between MPPT mode and non-MPPT mode to ensure the protection of the power converters
If a voltage dip happens the PV system continues working on MPPT mode if the extracted from the PV generator is less than the allowed maximum grid power
Summary
The world is approaching an energy crisis and environmental issues such as global warming and pollution, which direct research interest toward the improvement of renewable energy, such as photovoltaic systems, wind turbine, biomass energy, fuel cells, etc. The number of grid-connected photovoltaic (PV) systems is increasing significantly, and studies to ameliorate their reliability and performance are progressing [1–6]. The high penetration level of distributed generation systems can have a negative influence on the global reliability and stability of the grid, especially under grid fault conditions such as voltage sags and with the use of more and more high-tech devices with good performance and high effectiveness and with more sensitivity to their electric supply sources [7]. In the case that such sensitive devices are used in a key process, the interruption of the devices resulting from the voltage sag may lead to the shutdown of the whole industry; resulting in an enormous loss that may include environmental problems or even personal injury [8].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
