Current limiter strategy of grid-connected pv system for LVRT Enhancement

• Main Authors: Norazila, Jaalam, Nasrudin, Abd Rahim, Ab Halim, Abu Bakar
• Format: Conference or Workshop Item
• Language: English; English
• Published: Springer Science and Business Media Deutschland GmbH 2022
• Subjects: T Technology (General); TA Engineering (General). Civil engineering (General); TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://umpir.ump.edu.my/id/eprint/39644/1/Current%20Limiter%20Strategy%20of%20Grid-Connected%20PV%20System%20for%20LVRT%20Enhancement.pdf; http://umpir.ump.edu.my/id/eprint/39644/2/Current%20limiter%20strategy%20of%20grid-connected%20pv%20system%20for%20LVRT%20Enhancement_ABS.pdf; http://umpir.ump.edu.my/id/eprint/39644/; https://doi.org/10.1007/978-981-16-2406-3_86

A low-voltage ride-through (LVRT) is an ancillary service provided to a power grid to stabilize the grid voltage under weak grid conditions. Under these circumstances, a short-term disturbance is allowed to be ride-through to prevent unnecessary nuisance tripping during weak grid conditions. The main objective of this paper is to propose an active power curtailment strategy for a 1.038 MW grid-connected photovoltaic (PV) system to enhance the LVRT capability. A simple current limiter was applied to regulate the excessive DC-link voltage while the reactive power was controlled by a PI-tuning controller to maintain the voltage profile. Using MATLAB/Simulink environment, the dynamic behaviors of the proposed system were tested under 70% voltage sag and it was found that the proposed strategy is successful in curtailing the active power during low-voltage conditions and the excessive DC-link voltage can be controlled. Meanwhile, the whole system can maintain its operation without inverter disconnection and the voltage profile was improved even under weak grid conditions.