Current-limiting droop controller with fault-ride-through capability for grid-tied inverters

Abstract

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Enhanced Current-Limiting Droop Controller for Grid-Connected Inverters to Guarantee Stability and Maximize Power Injection Under Grid Faults

“…Since the apparent power S of the inverter is limited below (1 − p)V g I max due to the current-limiting property, then in (24) there iṡ…”

“…However, the controller proposed in [21] cannot utilize the full capacity of the inverter under faults and hence, the current is limited to a value lower than the maximum when a fault occurs depending on the grid voltage sag. According to the current grid codes, the capacity of the DERs connected to the grid should be utilized under faults in order to support the grid voltage and avoid the instant tripping of DERs [22], [23], [24], [25]. In this context, Fault-Ride-Through (FRT) requirements have been recently introduced to standardize the way DERs support the voltage at their connection point, by injecting reactive power depending to the voltage drop percentage [26].…”

Current-Limiting Droop Controller for Single-Phase Inverters Operating in Island Mode

“…For more details, the reader is referred to [6]. This concept of boundedness has also been investigated in [23]- [24].…”