Abstract
Large-scale offshore wind farms are integrated with onshore ac grids through the voltage source converter based high voltage direct current (VSC-HVDC) transmission system. The impact on the stability of the ac grids will be significant. The small signal model of a wind farm connected with voltage source converter based dc transmission system is studied in this paper. A suitable model for small signal stability analysis is presented. The control system of wind generator and the HVDC system has also been modeled in this model for small signal stability analysis. The impact of the control parameters on the network stability is investigated.
Highlights
Due to the advantages in speed control, and four-quadrant active and reactive power regular capabilities, the large offshore wind farms based on doubly fed induction generator (DFIG) have been planned around worldwide [1, 2]
With the anticipated high level penetration of offshore wind power increasing, voltage source converter based high voltage direct current (VSC-HVDC) connections are expected for wind power integration with the onshore ac grids [3]
The VSCHVDC transmission is emerging as the prospective technology to address the challenges associated with the integration of future offshore wind power [4]
Summary
Due to the advantages in speed control, and four-quadrant active and reactive power regular capabilities, the large offshore wind farms based on doubly fed induction generator (DFIG) have been planned around worldwide [1, 2]. VSC-HVDC transmission system was employed in [5] for transmitting offshore wind power equipped with fixed speed generators to the grid. In [6, 7], a 6 MW wind farm connected to the grid through the VSC-HVDC transmission system is studied. The control strategy of VSC-HVDC transmission system technology for connecting large DFIG-based wind farms over long distance is studied in [8]. In [9], line commutated HVDC systems had been used to connect a large DFIG-based offshore wind farm into the grid. A typical test network that combines conventional synchronous and offshore fixed speed wind generation connected to onshore via a dc network is used to illustrate the design of enhanced voltage source converter controllers. The DFIG-based wind farm via VSC-HVDC transmission system connected to the grid is studied.
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