Low-voltage ride-through capability enhancement of a grid-connected photovoltaic/wind hybrid power system

Modified STATCOM control strategy for fault ride-through capability enhancement of grid-connected PV/wind hybrid power system during voltage sag

“…In this section, the dynamic performance of the hybrid power system with the proposed STATCOM controller shown in Fig. 10 is analyzed and compared with the proposed FRT control strategy in the literature [7]. The proposed FRT control strategy is based on the modification of the inverter and RSC controllers so that inject reactive power during the faults and also activation of the outer crowbar protection system to protect the DFIG [7].…”

“…The FRT capability means that all generation power systems must remain connected to the electrical network during the transient grid faults and simultaneously inject reactive power to support the grid voltage, and also immediately resume the generated active power after fault clearance [3,4]. Nowadays, several literatures have been carried out in the area of FRT capability enhancement for grid-connected generation power systems during the grid disturbances [5][6][7]. Among them, Al-Shetwi [5], presented a comprehensive review of several FRT strategies and controllers for grid-connected PV power plants under the grid fault conditions.…”

“…The effectiveness of the proposed control strategies in augmentation of the dynamic stability of the hybrid power system has been evaluated during symmetrical and unsymmetrical faults in the grid. In [7], the paper proposed an efficient control strategy to enhance the FRT capability of a hybrid power system consisting of 1 MW PV station and 9 MW DFIG-based wind farm during balanced and unbalanced grid faults. The proposed FRT control strategy based on modification of the control scheme so that inject reactive power during the faults and activation of the outer crowbar protection system to protect the DFIG.…”

Optimal Shunt-Resonance Fault Current Limiter for Transient Stability Enhancement of a Grid-Connected Hybrid PV/Wind Power System

“…3 [30], which uses the quarter-period (T/4) delay structure to determine the magnitude of voltage drop at the PCC. Therefore, with the non-MPPT mode, the mismatched power between the generated DC power and the injected AC power is minimized so that the PV DC-link voltage can be prevented from reaching very high [12].…”

“…However, despite the effectiveness of the FRT strategy during both symmetrical and unsymmetrical faults, it requires an additional DC-chopper brake controller to absorb the excessive DC-link voltage, and also its performance is highly dependent on the fault detection method. Noureldeen et al [12] presented an effective control strategy based on the modification of the control approach and activation of the outer crowbar protection system to enhance the FRT capability of grid-connected large-scale hybrid PV/wind power system. Although the FRT control strategy showed superior performance during the unbalanced faults such as double-line-to-ground (2LG) and line-to-ground (1LG), it incurs some limitations during the three-line-toground (3LG) fault.…”