Fault ride through control of medium-voltage converters with LCL filter in distributed generation systems

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

“…When fault happens, the converter has to detect the incident and react quickly to the disturbance to mitigate the adverse effects on the inverter and the equipment connected to the grid, and also the upstream system [8][9][10]. Indeed, the revised grid codes require PV systems to inject a certain amount of reactive power in case of the low voltage faults [1,4,6,7,11,12]. This capability is called Low-Voltage Ride-Through (LVRT) [13,14].…”

“…With the fast increase of grid-connected Photovoltaic (PV) generation, PV systems should contribute to the grid stability by providing ancillary services, beyond the basic power delivery [1][2][3][4]. Also, based on the recently revised grid codes, PV inverters are preferred to stay connected during grid voltage faults [5][6][7].…”

A low-voltage ride-through strategy using mixed potential function for three-phase grid-connected PV systems

“…During the last decades, the use of distributed energy resources (DERs) has increased due to economic, technical and environmental concerns [1], [2]. With the rapid increase of grid-connected photovoltaic (PV) generation, PV systems should be more reliable and *Corresponding author Email address: 688418@swansea.ac.uk (Hao Wen) 2 provide high quality services, beyond the basic power delivery during grid voltage sags [3]- [8]. Power quality and current curtailment are the most important aspects of the gridconnected power converters under grid faults.…”

Control scheme for grid‐tied distributed generation inverter under unbalanced and distorted utility conditions with power quality ancillary services

“…A variety of potential RES such as photovoltaic arrays, wind turbine systems, variable‐speed diesel generators, micro‐hydro turbines, fuel cells and energy storage devices are being used in DG systems [1]. These DG systems are interfaced to the grid using power electronics‐based voltage source inverters (VSIs) [2–13]. These inverters inject active power available from the RES into the grid.…”

“…The control algorithm should ensure proper synchronisation with the utility voltages and must keep the generation going even if the PCC voltages are unbalanced and polluted. In [11–13], the DG inverters are controlled to provide only low voltage ride through operation under ideal grid voltage conditions. Under non‐ideal grid conditions, the effectiveness of the control method mainly depends on synchronisation unit.…”