Abstract
As wind power penetration has been gaining in the power grid for decades, a large number of the doubly fed induction generator(DFIG) based wind farms are being established around the globe. The power capacities of these wind farms may vary around hundreds of MW, and most of the wind farms are connected to long transmission cables whose impedances can not be ignored and require careful attention. Several works have investigated the impedance interaction between the DFIG based wind farm and long transmission cables which may unfortunately cause high frequency resonance (HFR). The main contribution of this paper is to investigate the influence of the variable wind farm capacity on the behavior of the HFR when certain transmission cables are provided. It is found out that the potential HFR may happen in certain wind farms, and the larger wind farm capacity causes more severe HFR due to the relatively weaker grid transmission capability. Simulation results based on Matlab/Simulink are given to validate the analysis of HFR.
Highlights
The recent rapid growth of renewable power generation has been reported all over the world
The grid part of the DFIG system contains the GSC and the LCL filter, and its impedance modeling in the stationary frame shown in Fig.2 can be obtained[13,14,15,16], Fig.1 Diagram of the DFIG based wind farm with multiple wind turbines connected to a long transmission cable
By comparing the impedance of the wind farm with three different power capacities, it can be found out that its magnitude response drops as the capacity increases, which is due to the increasing number of DFIG units working in parallel, while the phase response remains constant regardless of the different power capacity
Summary
The recent rapid growth of renewable power generation has been reported all over the world. The DFIG based wind farm delivers renewable power to the main grid via the long transmission cables. Inductive in the control frequency range[13,14,15,16] Due to their respective inductive and capacitive behaviors, a resonance may happen as a consequence of the impedance interaction between the wind farm and the transmission cable, which will be explained in detail. It is necessary to discuss the HFR under the condition of variable power capacity of the DFIG based wind farm. Song et al.: High Frequency Resonance in DFIG-Based Wind Farm with Variable Power Capacity
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