Abstract
Large-scale wind farms in commercial operations have demonstrated growing influence on the stability of an electricity network and the power quality thereof. Variations in the output power of large-scale wind farms cause voltage fluctuations in the corresponding electrical networks. To achieve low-voltage ride-through capability in a doubly fed induction generator (DFIG) during a fault event, this study proposes a real-time reactive power control strategy for effective DFIG application and a static synchronous compensator (STATCOM) for reactive power compensation. Mathematic models were developed for the DFIG and STATCOM, followed by the development of an indirect control scheme for the STATCOM based on decoupling dual-loop current control. Moreover, a real-world case study on a commercial wind farm comprising 23 DFIGs was conducted. The voltage regulation performance of the proposed reactive power control scheme against a fault event was also simulated. The simulation results revealed that enhanced fault ride-through capability and prompt recovery of the output voltage provided by a wind turbine generator could be achieved using the DFIG along with the STATCOM in the event of a three-phase short-circuit fault.
Highlights
Wind power is considered to be among the most promising renewable energy sources for commercial applications
Using a MATLAB/Simulink toolbox, this study developed a simulation model for 23 doubly fed induction generator (DFIG) constructed at Changhua Coastal Industrial Park, Taiwan
The comparison results indicated that the installation of the STATCOM at bus C9 of G9 increased the voltage from 0.235 to 0.311 pu when the fault occurred but did not demonstrate the influence on the output voltage rendered by other generators
Summary
Wind power is considered to be among the most promising renewable energy sources for commercial applications. Considering the reactive power characteristics of a DFIG, research has proposed a real-time reactive power control strategy for ensuring coordination among power generator sets In this strategy, a DFIG serves as a reactive power compensator for a connected electricity network for adequately regulating the PCC voltage level. SVC, STATCOM, distribution static synchronous compensator (D-STATCOM), and permanent magnet direct-drive wind turbines [23] have been widely used to provide high-performance steady-state and transient voltage control at the PCC. These devices are employed to develop fixed-speed wind turbines equipped with induction generators for steady-state voltage regulation and short-term transient voltage stability [24,25]. This study presents a dual-loop current control strategy based on the proposed STATCOM model
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