Abstract
The progressive growing of single-phase photovoltaic (PV) systems makes the Distribution System Operators (DSOs) update or revise the existing grid codes in order to guarantee the availability, quality, and reliability of the electrical system. It is expected that the future PV systems connected to the low-voltage grid will be more active with functionalities of low-voltage ride-through (LVRT) and the grid support capability, which is not the case today. In this paper, the operation principle is demonstrated for a single-phase grid-connected PV system in a low-voltage ride-through operation in order to map future challenges. The system is verified by simulations and experiments. Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems.
Highlights
More and more single-phase photovoltaic (PV) systems are connected to the public grid mainly because of the matured PV technology and the declined price of the PV module cell [1]
Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems
Many grid requirements are published in recent years by the Transmission System Operators, Distribution System Operators, or international standard committees (e.g., IEC and IEEE) in order to regulate the interaction between Distributed Generation (DG) and the public grid [2,3,4,5,6,7,8,9]
Summary
More and more single-phase photovoltaic (PV) systems are connected to the public grid mainly because of the matured PV technology and the declined price of the PV module cell [1]. Behind the thriving penetration of singlephase grid-connected PV systems, the phenomenon of largescale Distributed Generation (DG) systems connected to the public grid raises some concern on the availability, quality, and reliability of the grid On this basis, many grid requirements are published in recent years by the Transmission System Operators, Distribution System Operators, or international standard committees (e.g., IEC and IEEE) in order to regulate the interaction between DGs and the public grid [2,3,4,5,6,7,8,9]. The results show that the singlephase PV systems are ready for providing ancillary service in the future and the grid detection method has a significant impact on the performance of the single-phase PV systems under grid faults
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